diff --git a/CMakeLists.txt b/CMakeLists.txt
index 49f1525e4..45443c5bf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -198,10 +198,6 @@ if(NOT DEBUG_OUTPUT)
   add_definitions("-DQT_NO_DEBUG_OUTPUT")
 endif()
 
-if(ENABLE_EXTERNAL_LIBRARIES STREQUAL "AUTO")
-  set(AUTO_EXTERNAL_LIBRARIES ON CACHE INTERNAL "")
-endif()
-
 # declare build structures
 # !! change sdrbase/plugins/pluginmanager.cpp too !!
 add_definitions("-DLIB=\"lib${LIB_SUFFIX}\"")
@@ -713,11 +709,11 @@ if(WIN32)
   )
 endif()
 
-# When ENABLE_EXTERNAL_LIBRARIES is ON, we can build most of the required 3rd party libraries from source
-if(ENABLE_EXTERNAL_LIBRARIES)
-    add_subdirectory(external)
-    find_package(Boost REQUIRED)
-else()
+# When ENABLE_EXTERNAL_LIBRARIES is ON, we build most of the required 3rd party libraries from source
+# When ENABLE_EXTERNAL_LIBRARIES is AUTO, we only build 3rd party libraries that aren't already available
+# When ENABLE_EXTERNAL_LIBRARIES is OFF, we only use prebuilt libraries
+
+if (NOT ENABLE_EXTERNAL_LIBRARIES OR (ENABLE_EXTERNAL_LIBRARIES STREQUAL "AUTO"))
     find_package(Boost REQUIRED)
     find_package(FFTW3F REQUIRED)
     if(NOT ANDROID)
@@ -736,56 +732,61 @@ else()
     find_package(AptDec)
     find_package(LibDAB)
     find_package(HIDAPI)
+
+    # Devices
+    if(ENABLE_AIRSPY)
+        find_package(LibAIRSPY)
+    endif()
+    if(ENABLE_AIRSPYHF)
+        find_package(LibAIRSPYHF)
+    endif()
+    if(ENABLE_BLADERF)
+        find_package(LibBLADERF 2.0)
+    endif()
+    if(ENABLE_HACKRF)
+        find_package(LibHACKRF)
+    endif()
+    if(ENABLE_LIMESUITE)
+        find_package(LimeSuite)
+        if (LIMESUITE_FOUND)
+            add_definitions(-DHAS_LIMERFEUSB)
+        endif()
+    endif()
+    if(ENABLE_IIO) # PlutoSDR
+        find_package(LibIIO)
+    endif()
+    if(ENABLE_MIRISDR)
+        find_package(LibMiriSDR)
+    endif()
+    if(ENABLE_PERSEUS)
+        find_package(LibPerseus)
+    endif()
+    if(ENABLE_RTLSDR)
+        find_package(LibRTLSDR)
+    endif()
+    if(ENABLE_SDRPLAY)
+        find_package(SDRplay)
+    endif()
+    if(ENABLE_SOAPYSDR)
+        find_package(SoapySDR)
+    endif()
+    if(ENABLE_XTRX)
+        find_package(LibXTRX)
+    endif()
+    if(ENABLE_USRP)
+        find_package(UHD)
+    endif()
+endif()
+
+if(ENABLE_EXTERNAL_LIBRARIES)
+    add_subdirectory(external)
+    find_package(Boost REQUIRED)
 endif()
 
 if (LIBSIGMF_FOUND AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     add_definitions(-DHAS_LIBSIGMF)
 endif()
 
-# Devices
-if(ENABLE_AIRSPY)
-  find_package(LibAIRSPY)
-endif()
-if(ENABLE_AIRSPYHF)
-  find_package(LibAIRSPYHF)
-endif()
-if(ENABLE_BLADERF)
-  find_package(LibBLADERF 2.0)
-endif()
-if(ENABLE_HACKRF)
-  find_package(LibHACKRF)
-endif()
-if(ENABLE_LIMESUITE)
-  find_package(LimeSuite)
-  if (LIMESUITE_FOUND)
-    add_definitions(-DHAS_LIMERFEUSB)
-  endif()
-endif()
-if(ENABLE_IIO) # PlutoSDR
-  find_package(LibIIO)
-endif()
-if(ENABLE_MIRISDR)
-  find_package(LibMiriSDR)
-endif()
-if(ENABLE_PERSEUS)
-  find_package(LibPerseus)
-endif()
-if(ENABLE_RTLSDR)
-  find_package(LibRTLSDR)
-endif()
-if(ENABLE_SDRPLAY)
-  find_package(SDRplay)
-endif()
-if(ENABLE_SOAPYSDR)
-  find_package(SoapySDR)
-endif()
-if(ENABLE_XTRX)
-  find_package(LibXTRX)
-endif()
-if(ENABLE_USRP)
-  find_package(UHD)
-endif()
-
 if(ENABLE_FUNCUBE AND LIBUSB_FOUND AND HIDAPI_FOUND)
     add_subdirectory(fcdlib)
     add_subdirectory(fcdhid)
diff --git a/cmake/ci/build_codec2.sh b/cmake/ci/build_codec2.sh
index ab0b54d0f..da55fd55d 100644
--- a/cmake/ci/build_codec2.sh
+++ b/cmake/ci/build_codec2.sh
@@ -6,7 +6,7 @@ cd $HOME
 mkdir -p external && cd external
 mkdir -p drowe67 && cd drowe67
 
-git clone https://github.com/drowe67/codec2-dev.git
+git clone https://github.com/drowe67/codec2-dev.git codec2
 
 cd codec2
 git reset --hard "v1.0.3"
diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index d901a31d6..556676a00 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -19,6 +19,7 @@ set(LIBIIO_TAG 826563e41b5ce9890b75506f672017de8d76d52d)
 set(AIRSPYHF_TAG "1af81c0ca18944b8c9897c3c98dc0a991815b686")
 set(PERSEUS_TAG afefa23e3140ac79d845acb68cf0beeb86d09028)
 set(MIRISDR_TAG "v2.0.0")
+set(LIBSIGMF_TAG "new-namespaces")
 
 set(PTHREADS4W_TAG "Version-2-11-0-release")
 set(RTLSDR_TAG 5e73f90f1d85d8db2e583f3dbf1cff052d71d59b)
@@ -171,30 +172,6 @@ endif (WIN32)
 
 set(MACOS_EXTERNAL_LIBS_FIXUP "${CMAKE_BINARY_DIR}/${INSTALL_LIB_DIR}")
 
-if (AUTO_EXTERNAL_LIBRARIES)
-    find_package(Codec2)
-    find_package(CM256cc)
-    find_package(LibMbe)
-    find_package(SerialDV)
-    find_package(LibDSDcc)
-    find_package(LimeSuite)
-    find_package(LibBLADERF)
-    find_package(LibMiriSDR)
-    find_package(LibIIO)
-    find_package(LibAIRSPYHF)
-    find_package(LibPerseus)
-    find_package(LibRTLSDR)
-    find_package(LibUSB)
-    find_package(Opus)
-    find_package(Boost)
-    find_package(ZLIB)
-    find_package(UHD)
-    find_package(FFmpeg COMPONENTS AVCODEC AVFORMAT AVUTIL SWSCALE)
-    find_package(FAAD)
-    find_package(FFTW3F)
-    find_package(OpenCV OPTIONAL_COMPONENTS core highgui imgproc imgcodecs videoio)
-endif (AUTO_EXTERNAL_LIBRARIES)
-
 # While some of the following projects are not installed (to save time & space), some have to
 # be so that on MacOS, the paths embedded in the libraries to other libraries are correct (as they are set to
 # install path, not build). This is required for macdeployqt to be able to find them
@@ -216,6 +193,13 @@ macro(set_global NAME VALUE)
     set(${NAME} ${VALUE} PARENT_SCOPE)
 endmacro()
 
+# Setting a cache variable doesn't update the variable in parent scope if already set,
+# so we need to set the cache and parent_scope separately
+macro(set_global_cache NAME VALUE)
+    set(${NAME} ${VALUE} CACHE INTERNAL "")
+    set(${NAME} ${VALUE} PARENT_SCOPE)
+endmacro()
+
 if (NOT LIBUSB_FOUND AND NOT USE_PRECOMPILED_LIBS)
     # Cloning git repo doesn't include configure, so we download the bz2 which does
     ExternalProject_Add(libusb
@@ -227,7 +211,7 @@ if (NOT LIBUSB_FOUND AND NOT USE_PRECOMPILED_LIBS)
             )
     ExternalProject_Get_Property(libusb install_dir)
     set_global(LIBUSB_DEPENDS libusb)
-    set(LIBUSB_FOUND ON CACHE INTERNAL "")
+    set_global_cache(LIBUSB_FOUND ON)
     set(LIBUSB_EXTERNAL ON CACHE INTERNAL "")
     set(LIBUSB_INCLUDE_DIR "${install_dir}/include/libusb-1.0" CACHE INTERNAL "")
     if (WIN32)
@@ -240,7 +224,7 @@ if (NOT LIBUSB_FOUND AND NOT USE_PRECOMPILED_LIBS)
     endif ()
 endif (NOT LIBUSB_FOUND AND NOT USE_PRECOMPILED_LIBS)
 
-if (NOT HIDAPI_FOUND AND NOT USE_PRECOMPILED_LIBS)
+if (NOT HIDAPI_FOUND AND NOT USE_PRECOMPILED_LIBS AND ENABLE_FUNCUBE)
     ExternalProject_Add(hidapi
             GIT_REPOSITORY https://github.com/libusb/hidapi.git
             PREFIX "${EXTERNAL_BUILD_LIBRARIES}/hidapi"
@@ -249,7 +233,7 @@ if (NOT HIDAPI_FOUND AND NOT USE_PRECOMPILED_LIBS)
             )
     ExternalProject_Get_Property(hidapi install_dir)
     set_global(HIDAPI_DEPENDS hidapi)
-    set(HIDAPI_FOUND ON CACHE INTERNAL "")
+    set_global_cache(HIDAPI_FOUND ON)
     set(HIDAPI_EXTERNAL ON CACHE INTERNAL "")
     set(HIDAPI_ROOT_DIR "${install_dir}" CACHE INTERNAL "")
     set(HIDAPI_INCLUDE_DIRS "${install_dir}/include/hidapi" CACHE INTERNAL "")
@@ -257,7 +241,7 @@ if (NOT HIDAPI_FOUND AND NOT USE_PRECOMPILED_LIBS)
         set(HIDAPI_LIBRARIES "${install_dir}/lib/libhidapi${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
         set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${install_dir}/lib")
     endif ()
-endif (NOT HIDAPI_FOUND AND NOT USE_PRECOMPILED_LIBS)
+endif ()
 
 if (NOT OPUS_FOUND AND NOT USE_PRECOMPILED_LIBS)
     ExternalProject_Add(opus
@@ -269,7 +253,7 @@ if (NOT OPUS_FOUND AND NOT USE_PRECOMPILED_LIBS)
             )
     ExternalProject_Get_Property(opus install_dir)
     set_global(OPUS_DEPENDS opus)
-    set(OPUS_FOUND ON CACHE INTERNAL "")
+    set_global_cache(OPUS_FOUND ON)
     set(OPUS_EXTERNAL ON CACHE INTERNAL "")
     set(OPUS_INCLUDE_DIRS "${install_dir}/include" CACHE INTERNAL "")
     set(OPUS_PKG_CONFIG_DIR "${install_dir}/lib/pkgconfig" CACHE INTERNAL "")
@@ -292,7 +276,7 @@ if (NOT ZLIB_FOUND AND NOT USE_PRECOMPILED_LIBS)
             )
     ExternalProject_Get_Property(zlib install_dir)
     set_global(ZLIB_DEPENDS zlib)
-    set(ZLIB_FOUND ON CACHE INTERNAL "")
+    set_global_cache(ZLIB_FOUND ON)
     set(ZLIB_EXTERNAL ON CACHE INTERNAL "")
     set(ZLIB_INCLUDE_DIRS "${install_dir}/include" CACHE INTERNAL "")
     if (WIN32)
@@ -314,7 +298,7 @@ if (NOT FAAD_FOUND AND NOT USE_PRECOMPILED_LIBS)
             )
     ExternalProject_Get_Property(faad source_dir binary_dir install_dir)
     set_global(FAAD_DEPENDS faad)
-    set(FAAD_FOUND ON CACHE INTERNAL "")
+    set_global_cache(FAAD_FOUND ON)
     set(FAAD_EXTERNAL ON CACHE INTERNAL "")
     set(FAAD_INCLUDE_DIR "${install_dir}/include" CACHE INTERNAL "")
     if (WIN32)
@@ -338,7 +322,7 @@ if (NOT FFTW3F_FOUND AND NOT USE_PRECOMPILED_LIBS)
             )
     ExternalProject_Get_Property(fftw3f source_dir binary_dir)
     set_global(FFTW3F_DEPENDS fftw3f)
-    set(FFTW3F_FOUND ON CACHE INTERNAL "")
+    set_global_cache(FFTW3F_FOUND ON)
     set(FFTW3F_EXTERNAL ON CACHE INTERNAL "")
     set(FFTW3F_INCLUDE_DIRS "${source_dir}/api" "${binary_dir}" CACHE INTERNAL "")
     if (WIN32)
@@ -422,7 +406,7 @@ if (NOT FFMPEG_FOUND AND NOT USE_PRECOMPILED_LIBS)
         ExternalProject_Get_Property(x264 install_dir)
         set_global(X264_DEPENDS x264)
         set(X264_PKG_CONFIG_DIR "${install_dir}/lib/pkgconfig")
-        set(X264_FOUND ON CACHE INTERNAL "")
+        set_global_cache(X264_FOUND ON)
         set(X264_EXTERNAL ON CACHE INTERNAL "")
         if (APPLE)
             set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${install_dir}/lib")
@@ -440,7 +424,7 @@ if (NOT FFMPEG_FOUND AND NOT USE_PRECOMPILED_LIBS)
         ExternalProject_Get_Property(x265 install_dir)
         set_global(X265_DEPENDS x265)
         set(X265_PKG_CONFIG_DIR "${install_dir}/lib/pkgconfig")
-        set(X265_FOUND ON CACHE INTERNAL "")
+        set_global_cache(X265_FOUND ON)
         set(X265_EXTERNAL ON CACHE INTERNAL "")
         if (APPLE)
             set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${install_dir}/lib")
@@ -457,7 +441,7 @@ if (NOT FFMPEG_FOUND AND NOT USE_PRECOMPILED_LIBS)
         ExternalProject_Get_Property(fdk_aac install_dir)
         set_global(FDK_AAC_DEPENDS fdk_aac)
         set(FDK_AAC_PKG_CONFIG_DIR "${install_dir}/lib/pkgconfig")
-        set(FDK_AAC_FOUND ON CACHE INTERNAL "")
+        set_global_cache(FDK_AAC_FOUND ON)
         set(FDK_AAC_EXTERNAL ON CACHE INTERNAL "")
         if (APPLE)
             set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${install_dir}/lib")
@@ -476,7 +460,7 @@ if (NOT FFMPEG_FOUND AND NOT USE_PRECOMPILED_LIBS)
         ExternalProject_Get_Property(mpg123 install_dir)
         set_global(MPG123_DEPENDS mpg123)
         set(MPG123_PKG_CONFIG_DIR "${install_dir}/lib/pkgconfig")
-        set(MPG123_FOUND ON CACHE INTERNAL "")
+        set_global_cache(MPG123_FOUND ON)
         set(MPG123_EXTERNAL ON CACHE INTERNAL "")
         if (APPLE)
             set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${install_dir}/lib")
@@ -499,7 +483,7 @@ if (NOT FFMPEG_FOUND AND NOT USE_PRECOMPILED_LIBS)
         #set(LAME_PKG_CONFIG_DIR "${install_dir}/lib/pkgconfig")
         set(LAME_EXTRA_CFLAGS "-I${install_dir}/include")
         set(LAME_EXTRA_LDFLAGS "-L${install_dir}/lib")
-        set(LAME_FOUND ON CACHE INTERNAL "")
+        set_global_cache(LAME_FOUND ON)
         set(LAME_EXTERNAL ON CACHE INTERNAL "")
         if (APPLE)
             set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${install_dir}/lib")
@@ -520,7 +504,7 @@ if (NOT FFMPEG_FOUND AND NOT USE_PRECOMPILED_LIBS)
     ExternalProject_Get_Property(ffmpeg install_dir)
     set_global(FFMPEG_DEPENDS ffmpeg)
     set(FFMPEG_INSTALL_DIR "${install_dir}")
-    set(FFMPEG_FOUND ON CACHE INTERNAL "")
+    set_global_cache(FFMPEG_FOUND ON)
     set(FFMPEG_EXTERNAL ON CACHE INTERNAL "")
     set(FFMPEG_INCLUDE_DIRS "${install_dir}/include" CACHE INTERNAL "")
     set(AVCODEC_INCLUDE_DIRS "${install_dir}/include" CACHE INTERNAL "")
@@ -539,7 +523,8 @@ if (NOT FFMPEG_FOUND AND NOT USE_PRECOMPILED_LIBS)
 
 endif (NOT FFMPEG_FOUND AND NOT USE_PRECOMPILED_LIBS)
 
-if (NOT OpenCV_FOUND AND NOT USE_PRECOMPILED_LIBS)
+# OpenCV only used by Mod ATV curently
+if (NOT OpenCV_FOUND AND NOT USE_PRECOMPILED_LIBS AND ENABLE_CHANNELTX_MODATV)
     ExternalProject_Add(opencv
             GIT_REPOSITORY https://github.com/opencv/opencv.git
             GIT_TAG 4.5.5
@@ -551,7 +536,7 @@ if (NOT OpenCV_FOUND AND NOT USE_PRECOMPILED_LIBS)
             )
     ExternalProject_Get_Property(opencv source_dir binary_dir)
     set_global(OpenCV_DEPENDS opencv)
-    set(OpenCV_FOUND ON CACHE INTERNAL "")
+    set_global_cache(OpenCV_FOUND ON)
     set(OpenCV_EXTERNAL ON CACHE INTERNAL "")
     set(OpenCV_INCLUDE_DIRS
         "${source_dir}/modules/calib3d/include"
@@ -586,7 +571,7 @@ if (NOT OpenCV_FOUND AND NOT USE_PRECOMPILED_LIBS)
         set(OpenCV_LIBS "${binary_dir}/lib/libopencv_core${CMAKE_SHARED_LIBRARY_SUFFIX};${binary_dir}/lib/libopencv_core${CMAKE_SHARED_LIBRARY_SUFFIX};${binary_dir}/lib/libopencv_highgui${CMAKE_SHARED_LIBRARY_SUFFIX};${binary_dir}/lib/libopencv_video${CMAKE_SHARED_LIBRARY_SUFFIX};${binary_dir}/lib/libopencv_videoio${CMAKE_SHARED_LIBRARY_SUFFIX};${binary_dir}/lib/libopencv_imgproc${CMAKE_SHARED_LIBRARY_SUFFIX};${binary_dir}/lib/libopencv_imgcodecs${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
         set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${binary_dir}/lib")
     endif ()
-endif (NOT OpenCV_FOUND AND NOT USE_PRECOMPILED_LIBS)
+endif (NOT OpenCV_FOUND AND NOT USE_PRECOMPILED_LIBS AND ENABLE_CHANNELTX_MODATV)
 
 if ((NOT CODEC2_FOUND OR CODEC2_EXTERNAL) AND NOT USE_PRECOMPILED_LIBS)
     # needs speexdsp
@@ -608,7 +593,7 @@ if ((NOT CODEC2_FOUND OR CODEC2_EXTERNAL) AND NOT USE_PRECOMPILED_LIBS)
             )
     ExternalProject_Get_Property(codec2 source_dir binary_dir)
     set_global(CODEC2_DEPENDS codec2)
-    set(CODEC2_FOUND ON CACHE INTERNAL "")
+    set_global_cache(CODEC2_FOUND ON)
     set(CODEC2_EXTERNAL ON CACHE INTERNAL "")
     set(CODEC2_INCLUDE_DIR "${source_dir}/src" "${binary_dir}" CACHE INTERNAL "")
     if (WIN32)
@@ -649,7 +634,7 @@ if (NOT CM256CC_FOUND OR CM256CC_EXTERNAL)
             )
     ExternalProject_Get_Property(cm256cc source_dir binary_dir)
     set_global(CM256CC_DEPENDS cm256cc)
-    set(CM256CC_FOUND ON CACHE INTERNAL "")
+    set_global_cache(CM256CC_FOUND ON)
     set(CM256CC_EXTERNAL ON CACHE INTERNAL "")
     # we need cm256cc/library.h
     set(CM256CC_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/cm256cc/src" CACHE INTERNAL "")
@@ -682,7 +667,7 @@ if ((NOT LIBDSDCC_FOUND OR LIBDSDCC_EXTERNAL) AND (NOT LIBMBE_FOUND OR LIBMBE_EX
     ExternalProject_Get_Property(mbelib source_dir binary_dir)
     set(USE_MBELIB ON)
     set_global(DSDCC_DEPENDS mbelib)
-    set(LIBMBE_FOUND ON CACHE INTERNAL "")
+    set_global_cache(LIBMBE_FOUND ON)
     set(LIBMBE_EXTERNAL ON CACHE INTERNAL "")
     set(LIBMBE_INCLUDE_DIR "${source_dir}" CACHE INTERNAL "")
     if (WIN32)
@@ -712,7 +697,7 @@ if (NOT LIBSERIALDV_FOUND OR LIBSERIALDV_EXTERNAL)
             TEST_COMMAND ""
             )
     ExternalProject_Get_Property(serialdv source_dir binary_dir)
-    set(LIBSERIALDV_FOUND ON CACHE INTERNAL "")
+    set_global_cache(LIBSERIALDV_FOUND ON)
     set(LIBSERIALDV_EXTERNAL ON CACHE INTERNAL "")
     set(LIBSERIALDV_INCLUDE_DIR "${source_dir}" CACHE INTERNAL "")
     if (WIN32)
@@ -753,7 +738,7 @@ if ((NOT LIBDSDCC_FOUND OR LIBDSDCC_EXTERNAL) AND LIBMBE_FOUND)
             TEST_COMMAND ""
             )
     ExternalProject_Get_Property(dsdcc source_dir binary_dir)
-    set(LIBDSDCC_FOUND ON CACHE INTERNAL "")
+    set_global_cache(LIBDSDCC_FOUND ON)
     set(LIBDSDCC_EXTERNAL ON CACHE INTERNAL "")
     set(LIBDSDCC_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/dsdcc/src" CACHE INTERNAL "")
     if (WIN32)
@@ -766,67 +751,87 @@ if ((NOT LIBDSDCC_FOUND OR LIBDSDCC_EXTERNAL) AND LIBMBE_FOUND)
     endif ()
 endif ((NOT LIBDSDCC_FOUND OR LIBDSDCC_EXTERNAL) AND LIBMBE_FOUND)
 
+if (LINUX AND (NOT LIBSIGMF_FOUND OR LIBSIGMF_EXTERNAL))
+    set(LIBSIGMF_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/liblibsigmf${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
+    ExternalProject_Add(libsigmf
+            GIT_REPOSITORY https://github.com/f4exb/libsigmf.git
+            GIT_TAG ${LIBSIGMF_TAG}
+            PREFIX "${EXTERNAL_BUILD_LIBRARIES}/libsigmf"
+            CMAKE_ARGS ${COMMON_CMAKE_ARGS} -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
+            BUILD_BYPRODUCTS "${LIBSIGMF_LIBRARIES}"            
+            TEST_COMMAND ""
+            )
+    ExternalProject_Get_Property(libsigmf install_dir)
+    set_global(LIBSIGMF_DEPENDS libsigmf)
+    set_global_cache(LIBSIGMF_FOUND ON)
+    set(LIBSIGMF_EXTERNAL ON CACHE INTERNAL "")
+    set(LIBSIGMF_INCLUDE_DIR "${install_dir}/include" CACHE INTERNAL "")
+endif (LINUX AND (NOT LIBSIGMF_FOUND OR LIBSIGMF_EXTERNAL))
+
 # For APT demodulator
-if (WIN32)
-    set(APT_LIBRARIES "${SDRANGEL_BINARY_LIB_DIR}/apt.lib" CACHE INTERNAL "")
-elseif (LINUX)
-    set(APT_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/libapt${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
-endif()
-ExternalProject_Add(apt
-        GIT_REPOSITORY https://github.com/srcejon/aptdec.git
-        GIT_TAG libaptdec
-        PREFIX "${EXTERNAL_BUILD_LIBRARIES}/apt"
-        CMAKE_ARGS ${COMMON_CMAKE_ARGS}
-        BUILD_BYPRODUCTS "${APT_LIBRARIES}"
-        INSTALL_COMMAND ""
-        TEST_COMMAND ""
-        )
-ExternalProject_Get_Property(apt source_dir binary_dir)
-set(APT_DEPENDS apt CACHE INTERNAL "")
-set(APT_FOUND ON CACHE INTERNAL "")
-set(APT_EXTERNAL ON CACHE INTERNAL "")
-set(APT_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/apt/src/apt/src" CACHE INTERNAL "")
-if (WIN32)
-    install(FILES "${SDRANGEL_BINARY_BIN_DIR}/apt${CMAKE_SHARED_LIBRARY_SUFFIX}" DESTINATION "${INSTALL_LIB_DIR}")
-elseif (APPLE)
-    set(APT_LIBRARIES "${binary_dir}/libapt${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
-    install(DIRECTORY "${binary_dir}/" DESTINATION "${INSTALL_LIB_DIR}"
-            FILES_MATCHING PATTERN "libapt*${CMAKE_SHARED_LIBRARY_SUFFIX}")
-    set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${binary_dir}/")
+if(ENABLE_CHANNELRX_DEMODAPT)
+    if (WIN32)
+        set(APT_LIBRARIES "${SDRANGEL_BINARY_LIB_DIR}/apt.lib" CACHE INTERNAL "")
+    elseif (LINUX)
+        set(APT_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/libapt${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
+    endif()
+    ExternalProject_Add(apt
+            GIT_REPOSITORY https://github.com/srcejon/aptdec.git
+            GIT_TAG libaptdec
+            PREFIX "${EXTERNAL_BUILD_LIBRARIES}/apt"
+            CMAKE_ARGS ${COMMON_CMAKE_ARGS}
+            BUILD_BYPRODUCTS "${APT_LIBRARIES}"
+            INSTALL_COMMAND ""
+            TEST_COMMAND ""
+            )
+    ExternalProject_Get_Property(apt source_dir binary_dir)
+    set(APT_DEPENDS apt CACHE INTERNAL "")
+    set_global_cache(APT_FOUND ON)
+    set(APT_EXTERNAL ON CACHE INTERNAL "")
+    set(APT_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/apt/src/apt/src" CACHE INTERNAL "")
+    if (WIN32)
+        install(FILES "${SDRANGEL_BINARY_BIN_DIR}/apt${CMAKE_SHARED_LIBRARY_SUFFIX}" DESTINATION "${INSTALL_LIB_DIR}")
+    elseif (APPLE)
+        set(APT_LIBRARIES "${binary_dir}/libapt${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
+        install(DIRECTORY "${binary_dir}/" DESTINATION "${INSTALL_LIB_DIR}"
+                FILES_MATCHING PATTERN "libapt*${CMAKE_SHARED_LIBRARY_SUFFIX}")
+        set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${binary_dir}/")
+    endif ()
 endif ()
 
-# For Satellite Tracker feature
-# No tags for this in github - but doesn't change often
-# Fails to build with CMAKE_INTERPROCEDURAL_OPTIMIZATION=ON on Windows
-if (WIN32)
-    set(SGP4_LIBRARIES "${SDRANGEL_BINARY_LIB_DIR}/sgp4s.lib" CACHE INTERNAL "")
-elseif (LINUX)
-    set(SGP4_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/libsgp4s${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
-endif()
-ExternalProject_Add(sgp4
-        GIT_REPOSITORY https://github.com/dnwrnr/sgp4.git
-        PREFIX "${EXTERNAL_BUILD_LIBRARIES}/sgp4"
-        CMAKE_ARGS ${COMMON_CMAKE_ARGS}
-        -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=OFF
-        BUILD_BYPRODUCTS "${SGP4_LIBRARIES}"
-        INSTALL_COMMAND ""
-        TEST_COMMAND ""
-        )
-ExternalProject_Get_Property(sgp4 source_dir binary_dir)
-set(SGP4_DEPENDS sgp4 CACHE INTERNAL "")
-set(SGP4_FOUND ON CACHE INTERNAL "")
-set(SGP4_EXTERNAL ON CACHE INTERNAL "")
-set(SGP4_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/sgp4/src/sgp4/libsgp4" CACHE INTERNAL "")
-if (WIN32)
-    install(FILES "${SDRANGEL_BINARY_BIN_DIR}/sgp4s${CMAKE_SHARED_LIBRARY_SUFFIX}" DESTINATION "${INSTALL_LIB_DIR}")
-elseif (APPLE)
-    set(SGP4_LIBRARIES "${binary_dir}/libsgp4/libsgp4s${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
-    install(DIRECTORY "${binary_dir}/libsgp4" DESTINATION "${INSTALL_LIB_DIR}"
-            FILES_MATCHING PATTERN "libsgp4s*${CMAKE_SHARED_LIBRARY_SUFFIX}")
-    set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${binary_dir}/libsgp4")
+# For Satellite Tracker feature and APT demod
+if(ENABLE_FEATURE_SATELLITETRACKER OR ENABLE_CHANNELRX_DEMODAPT)
+    # No tags for this in github - but doesn't change often
+    # Fails to build with CMAKE_INTERPROCEDURAL_OPTIMIZATION=ON on Windows
+    if (WIN32)
+        set(SGP4_LIBRARIES "${SDRANGEL_BINARY_LIB_DIR}/sgp4s.lib" CACHE INTERNAL "")
+    elseif (LINUX)
+        set(SGP4_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/libsgp4s${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
+    endif()
+    ExternalProject_Add(sgp4
+            GIT_REPOSITORY https://github.com/dnwrnr/sgp4.git
+            PREFIX "${EXTERNAL_BUILD_LIBRARIES}/sgp4"
+            CMAKE_ARGS ${COMMON_CMAKE_ARGS}
+            -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=OFF
+            BUILD_BYPRODUCTS "${SGP4_LIBRARIES}"
+            INSTALL_COMMAND ""
+            TEST_COMMAND ""
+            )
+    ExternalProject_Get_Property(sgp4 source_dir binary_dir)
+    set(SGP4_DEPENDS sgp4 CACHE INTERNAL "")
+    set_global_cache(SGP4_FOUND ON)
+    set(SGP4_EXTERNAL ON CACHE INTERNAL "")
+    set(SGP4_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/sgp4/src/sgp4/libsgp4" CACHE INTERNAL "")
+    if (WIN32)
+        install(FILES "${SDRANGEL_BINARY_BIN_DIR}/sgp4s${CMAKE_SHARED_LIBRARY_SUFFIX}" DESTINATION "${INSTALL_LIB_DIR}")
+    elseif (APPLE)
+        set(SGP4_LIBRARIES "${binary_dir}/libsgp4/libsgp4s${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
+        install(DIRECTORY "${binary_dir}/libsgp4" DESTINATION "${INSTALL_LIB_DIR}"
+                FILES_MATCHING PATTERN "libsgp4s*${CMAKE_SHARED_LIBRARY_SUFFIX}")
+        set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${binary_dir}/libsgp4")
+    endif ()
 endif ()
 
-
 # requirements needed by many packages on windows
 if (WIN32)
     ExternalProject_Add(pthreads4w
@@ -842,7 +847,7 @@ if (WIN32)
             )
     ExternalProject_Get_Property(pthreads4w source_dir binary_dir)
     set_global(PTHREADS4W_DEPENDS pthreads4w)
-    set(PTHREADS4W_FOUND ON CACHE INTERNAL "")
+    set_global_cache(PTHREADS4W_FOUND ON)
     set(PTHREADS4W_EXTERNAL ON CACHE INTERNAL "")
     set(PTHREADS4W_INCLUDE_DIR "${source_dir}" CACHE INTERNAL "")
     set(PTHREADS4W_LIBRARIES "${source_dir}/pthreadVC2.lib" CACHE INTERNAL "")
@@ -853,7 +858,7 @@ if (WIN32)
 endif (WIN32)
 
 # For DAB demodulator
-if (ZLIB_FOUND AND FAAD_FOUND)
+if (ZLIB_FOUND AND FAAD_FOUND AND ENABLE_CHANNELRX_DEMODDAB)
     if (WIN32)
         set(DAB_LIBRARIES "${SDRANGEL_BINARY_LIB_DIR}/dab_lib.lib" CACHE INTERNAL "")
     elseif (LINUX)
@@ -899,7 +904,7 @@ if (ZLIB_FOUND AND FAAD_FOUND)
     endif(WIN32)
     ExternalProject_Get_Property(dab source_dir binary_dir)
     set_global(DAB_DEPENDS dab)
-    set(DAB_FOUND ON CACHE INTERNAL "")
+    set_global_cache(DAB_FOUND ON)
     set(DAB_EXTERNAL ON CACHE INTERNAL "")
     set(DAB_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/dab/src/dab" CACHE INTERNAL "")
     if (WIN32)
@@ -914,12 +919,12 @@ else()
     message(STATUS "Can't build DAB library as missing zlib or faad")
 endif()
 
-# Device interface libraries. Use external libraries build for these. Only Linux for now.
+# Device interface libraries.
 if (LINUX)
     # apt install liblimesuite-dev (only on ubuntu 18.04). Can be picky on version though so let's build it.
     # needs pkgconfig and libusb
-    if (NOT LIMESUITE_FOUND OR LIMESUITE_EXTERNAL)
-        set(LIMESUITE_FOUND ON CACHE INTERNAL "")
+    if (ENABLE_LIMESUITE AND (NOT LIMESUITE_FOUND OR LIMESUITE_EXTERNAL))
+        set_global_cache(LIMESUITE_FOUND ON)
         set(LIMESUITE_EXTERNAL ON CACHE INTERNAL "")
         set(LIMESUITE_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/limesuite/src/limesuite/src" CACHE INTERNAL "")
         set(LIMESUITE_LIBRARY "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/libLimeSuite.so" CACHE INTERNAL "")
@@ -943,12 +948,12 @@ if (LINUX)
                 )
         ExternalProject_Get_Property(limesuite source_dir)
         makeCopyFile("${source_dir}/src/limeRFE/limeRFE.h" "${source_dir}/src/lime/limeRFE.h" limesuite)
-    endif (NOT LIMESUITE_FOUND OR LIMESUITE_EXTERNAL)
+    endif ()
 
     # apt install libbladerf-dev
     # needs pkgconfig and libusb
-    if (NOT LIBBLADERF_FOUND OR LIBBLADERF_EXTERNAL)
-        set(LIBBLADERF_FOUND ON CACHE INTERNAL "")
+    if (ENABLE_BLADERF AND (NOT LIBBLADERF_FOUND OR LIBBLADERF_EXTERNAL))
+        set_global_cache(LIBBLADERF_FOUND ON)
         set(LIBBLADERF_EXTERNAL ON CACHE INTERNAL "")
         set(LIBBLADERF_INCLUDE_DIRS "${EXTERNAL_BUILD_LIBRARIES}/bladerf/src/bladerf/host/libraries/libbladeRF/include" CACHE INTERNAL "")
         set(LIBBLADERF_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/bladerf/src/bladerf-build/output/libbladeRF.so.2" CACHE INTERNAL "")
@@ -964,12 +969,12 @@ if (LINUX)
                 TEST_COMMAND ""
                 )
         install(FILES "${LIBBLADERF_LIBRARIES}" DESTINATION "${INSTALL_LIB_DIR}")
-    endif (NOT LIBBLADERF_FOUND OR LIBBLADERF_EXTERNAL)
+    endif ()
 
     # apt install libiio-dev
     # needs pkgconfig, libusb, libxml2, lzma, xz, libiconv
-    if (NOT LIBIIO_FOUND OR LIBIIO_EXTERNAL)
-        set(LIBIIO_FOUND ON CACHE INTERNAL "")
+    if (ENABLE_IIO AND (NOT LIBIIO_FOUND OR LIBIIO_EXTERNAL))
+        set_global_cache(LIBIIO_FOUND ON)
         set(LIBIIO_EXTERNAL ON CACHE INTERNAL "")
         set(LIBIIO_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/libiio/src/libiio" CACHE INTERNAL "")
         set(LIBIIO_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/libiio.so" CACHE INTERNAL "")
@@ -986,12 +991,12 @@ if (LINUX)
                 INSTALL_COMMAND ""
                 TEST_COMMAND ""
                 )
-    endif (NOT LIBIIO_FOUND OR LIBIIO_EXTERNAL)
+    endif ()
 
     # apt install libairspyhf-dev (only on ubuntu 18.04)
     # needs libusb and pkgconfig
-    if (NOT LIBAIRSPYHF_FOUND OR LIBAIRSPYHF_EXTERNAL)
-        set(LIBAIRSPYHF_FOUND ON CACHE INTERNAL "")
+    if (ENABLE_AIRSPYHF AND (NOT LIBAIRSPYHF_FOUND OR LIBAIRSPYHF_EXTERNAL))
+        set_global_cache(LIBAIRSPYHF_FOUND ON)
         set(LIBAIRSPYHF_EXTERNAL ON CACHE INTERNAL "")
         set(LIBAIRSPYHF_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/libairspyhf.so" CACHE INTERNAL "")
         ExternalProject_Add(airspyhf
@@ -1006,11 +1011,11 @@ if (LINUX)
         ExternalProject_Get_Property(airspyhf source_dir)
         set(LIBAIRSPYHF_INCLUDE_DIR "${source_dir}/.." CACHE INTERNAL "")
         makeLink("${source_dir}/libairspyhf/src" "${source_dir}/../libairspyhf" airspyhf)
-    endif (NOT LIBAIRSPYHF_FOUND OR LIBAIRSPYHF_EXTERNAL)
+    endif ()
 
     # needs pkgconfig, libusb, autoconf, automake and libtool
-    if (NOT LIBPERSEUS_FOUND OR LIBPERSEUS_EXTERNAL)
-        set(LIBPERSEUS_FOUND ON CACHE INTERNAL "")
+    if (ENABLE_PERSEUS AND (NOT LIBPERSEUS_FOUND OR LIBPERSEUS_EXTERNAL))
+        set_global_cache(LIBPERSEUS_FOUND ON)
         set(LIBPERSEUS_EXTERNAL ON CACHE INTERNAL "")
         set(LIBPERSEUS_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/perseus/src/perseus" CACHE INTERNAL "")
         set(LIBPERSEUS_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/libperseus-sdr.so" CACHE INTERNAL "")
@@ -1023,12 +1028,12 @@ if (LINUX)
                 INSTALL_COMMAND ""
                 TEST_COMMAND ""
                 )
-    endif (NOT LIBPERSEUS_FOUND OR LIBPERSEUS_EXTERNAL)
+    endif ()
 
     # apt install librtlsdr-dev
     # needs pkgconfig and libusb
-    if (NOT LIBRTLSDR_FOUND OR LIBRTLSDR_EXTERNAL)
-        set(LIBRTLSDR_FOUND ON CACHE INTERNAL "")
+    if (ENABLE_RTLSDR AND (NOT LIBRTLSDR_FOUND OR LIBRTLSDR_EXTERNAL))
+        set_global_cache(LIBRTLSDR_FOUND ON)
         set(LIBRTLSDR_EXTERNAL ON CACHE INTERNAL "")
         set(LIBRTLSDR_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/rtlsdr/src/rtlsdr/include" CACHE INTERNAL "")
         set(LIBRTLSDR_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/librtlsdr.so" CACHE INTERNAL "")
@@ -1042,11 +1047,11 @@ if (LINUX)
                 INSTALL_COMMAND ""
                 TEST_COMMAND ""
                 )
-    endif (NOT LIBRTLSDR_FOUND OR LIBRTLSDR_EXTERNAL)
+    endif ()
 
     # needs pkgconfig and libusb
-    if (NOT LIBMIRISDR_FOUND OR LIBMIRISDR_EXTERNAL)
-        set(LIBMIRISDR_FOUND ON CACHE INTERNAL "")
+    if (ENABLE_MIRISDR AND (NOT LIBMIRISDR_FOUND OR LIBMIRISDR_EXTERNAL))
+        set_global_cache(LIBMIRISDR_FOUND ON)
         set(LIBMIRISDR_EXTERNAL ON CACHE INTERNAL "")
         set(LIBMIRISDR_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/libmirisdr/src/libmirisdr/include" CACHE INTERNAL "")
         set(LIBMIRISDR_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/libmirisdr.so" CACHE INTERNAL "")
@@ -1059,7 +1064,7 @@ if (LINUX)
                 INSTALL_COMMAND ""
                 TEST_COMMAND ""
                 )
-    endif (NOT LIBMIRISDR_FOUND OR LIBMIRISDR_EXTERNAL)
+    endif ()
 
 endif (LINUX)
 
@@ -1091,7 +1096,7 @@ if (WIN32 OR APPLE)
                 TEST_COMMAND ""
                 )
         ExternalProject_Get_Property(rtlsdr source_dir binary_dir)
-        set(LIBRTLSDR_FOUND ON CACHE INTERNAL "")
+        set_global_cache(LIBRTLSDR_FOUND ON)
         set(LIBRTLSDR_EXTERNAL ON CACHE INTERNAL "")
         set(LIBRTLSDR_INCLUDE_DIR "${source_dir}/include" CACHE INTERNAL "")
         if (WIN32)
@@ -1134,7 +1139,7 @@ if (WIN32 OR APPLE)
                 TEST_COMMAND ""
                 )
         ExternalProject_Get_Property(limesuite source_dir binary_dir install_dir)
-        set(LIMESUITE_FOUND ON CACHE INTERNAL "")
+        set_global_cache(LIMESUITE_FOUND ON)
         set(LIMESUITE_EXTERNAL ON CACHE INTERNAL "")
         set(LIMESUITE_INCLUDE_DIR "${install_dir}/include" CACHE INTERNAL "")
         if (WIN32)
@@ -1167,7 +1172,7 @@ if (WIN32 OR APPLE)
                 TEST_COMMAND ""
                 )
         ExternalProject_Get_Property(soapysdr source_dir binary_dir)
-        set(SOAPYSDR_FOUND ON CACHE INTERNAL "")
+        set_global_cache(SOAPYSDR_FOUND ON)
         set(SOAPYSDR_EXTERNAL ON CACHE INTERNAL "")
         set(SOAPYSDR_INCLUDE_DIR "${source_dir}/include" CACHE INTERNAL "")
         if (WIN32)
@@ -1210,7 +1215,7 @@ if (WIN32 OR APPLE)
             add_dependencies(airspy pthreads4w)
         endif ()
         ExternalProject_Get_Property(airspy source_dir binary_dir)
-        set(LIBAIRSPY_FOUND ON CACHE INTERNAL "")
+        set_global_cache(LIBAIRSPY_FOUND ON)
         set(LIBAIRSPY_EXTERNAL ON CACHE INTERNAL "")
         set(LIBAIRSPY_INCLUDE_DIR "${source_dir}/libairspy/src" CACHE INTERNAL "")
         if (WIN32)
@@ -1252,7 +1257,7 @@ if (WIN32 OR APPLE)
             add_dependencies(airspyhf pthreads4w)
         endif()
         ExternalProject_Get_Property(airspyhf source_dir binary_dir)
-        set(LIBAIRSPYHF_FOUND ON CACHE INTERNAL "")
+        set_global_cache(LIBAIRSPYHF_FOUND ON)
         set(LIBAIRSPYHF_EXTERNAL ON CACHE INTERNAL "")
         set(LIBAIRSPYHF_INCLUDE_DIR "${source_dir}/libairspyhf/src" CACHE INTERNAL "")
         if (WIN32)
@@ -1297,7 +1302,7 @@ if (WIN32 OR APPLE)
             add_dependencies(hackrf pthreads4w)
         endif()
         ExternalProject_Get_Property(hackrf source_dir binary_dir)
-        set(LIBHACKRF_FOUND ON CACHE INTERNAL "")
+        set_global_cache(LIBHACKRF_FOUND ON)
         set(LIBHACKRF_EXTERNAL ON CACHE INTERNAL "")
         set(LIBHACKRF_INCLUDE_DIR "${source_dir}/host/libhackrf" CACHE INTERNAL "")
         if (WIN32)
@@ -1343,7 +1348,7 @@ if (WIN32 OR APPLE)
         endif ()
         ExternalProject_Get_Property(libxml2 source_dir binary_dir)
         set_global(LIBXML2_DEPENDS libxml2)
-        set(LIBXML2_FOUND ON CACHE INTERNAL "")
+        set_global_cache(LIBXML2_FOUND ON)
         set(LIBXML2_EXTERNAL ON CACHE INTERNAL "")
         if (WIN32)
             set(LIBXML2_INCLUDE_DIR "${source_dir}/include" CACHE INTERNAL "")
@@ -1390,7 +1395,7 @@ if (WIN32 OR APPLE)
             add_dependencies(libiio pthreads4w)
         endif()
         ExternalProject_Get_Property(libiio source_dir binary_dir)
-        set(LIBIIO_FOUND ON CACHE INTERNAL "")
+        set_global_cache(LIBIIO_FOUND ON)
         set(LIBIIO_EXTERNAL ON CACHE INTERNAL "")
         set(LIBIIO_INCLUDE_DIR "${source_dir}" CACHE INTERNAL "")
         if (WIN32)
@@ -1441,7 +1446,7 @@ if (WIN32 OR APPLE)
             add_dependencies(bladerf pthreads4w)
         endif()
         ExternalProject_Get_Property(bladerf source_dir binary_dir)
-        set(LIBBLADERF_FOUND ON CACHE INTERNAL "")
+        set_global_cache(LIBBLADERF_FOUND ON)
         set(LIBBLADERF_EXTERNAL ON CACHE INTERNAL "")
         set(LIBBLADERF_INCLUDE_DIRS "${source_dir}/host/libraries/libbladeRF/include" CACHE INTERNAL "")
         if (WIN32)
@@ -1471,7 +1476,7 @@ if (WIN32 OR APPLE)
                 TEST_COMMAND ""
                 )
         ExternalProject_Get_Property(uhd install_dir)
-        set(UHD_FOUND ON CACHE INTERNAL "")
+        set_global_cache(UHD_FOUND ON)
         set(UHD_EXTERNAL ON CACHE INTERNAL "")
         set(UHD_INCLUDE_DIR "${install_dir}/include" CACHE INTERNAL "")
         if (WIN32)
diff --git a/plugins/feature/CMakeLists.txt b/plugins/feature/CMakeLists.txt
index e9abffe2c..43cdb07d3 100644
--- a/plugins/feature/CMakeLists.txt
+++ b/plugins/feature/CMakeLists.txt
@@ -2,78 +2,116 @@ project(feature)
 
 if (ENABLE_FEATURE_GS232CONTROLLER AND Qt${QT_DEFAULT_MAJOR_VERSION}SerialPort_FOUND)
     add_subdirectory(gs232controller)
+else()
+    message(STATUS "Not building gs232controller (ENABLE_FEATURE_GS232CONTROLLER=${ENABLE_FEATURE_GS232CONTROLLER} Qt${QT_DEFAULT_MAJOR_VERSION}SerialPort_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}SerialPort_FOUND)")
 endif()
 
 if (ENABLE_FEATURE_MAP AND Qt${QT_DEFAULT_MAJOR_VERSION}Quick_FOUND AND Qt${QT_DEFAULT_MAJOR_VERSION}QuickWidgets_FOUND AND Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND AND Qt${QT_DEFAULT_MAJOR_VERSION}Location_FOUND)
     add_subdirectory(map)
+else()
+    message(STATUS "Not building map (ENABLE_FEATURE_MAP=${ENABLE_FEATURE_MAP} Qt${QT_DEFAULT_MAJOR_VERSION}Quick_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Quick_FOUND} Qt${QT_DEFAULT_MAJOR_VERSION}QuickWidgets_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}QuickWidgets_FOUND} Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND} Qt${QT_DEFAULT_MAJOR_VERSION}Location_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Location_FOUND})")
 endif()
 
 if (ENABLE_FEATURE_VORLOCALIZER AND Qt${QT_DEFAULT_MAJOR_VERSION}Quick_FOUND AND Qt${QT_DEFAULT_MAJOR_VERSION}QuickWidgets_FOUND AND Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND)
     add_subdirectory(vorlocalizer)
+else()
+    message(STATUS "Not building vorlocalizer (ENABLE_FEATURE_VORLOCALIZER=${ENABLE_FEATURE_VORLOCALIZER} Qt${QT_DEFAULT_MAJOR_VERSION}Quick_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Quick_FOUND} Qt${QT_DEFAULT_MAJOR_VERSION}QuickWidgets_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}QuickWidgets_FOUND} Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND})")
 endif()
 
 if (ENABLE_FEATURE_AFC)
     add_subdirectory(afc)
+else()
+    message(STATUS "Not building afc (ENABLE_FEATURE_AFC=${ENABLE_FEATURE_AFC})")
 endif()
 
 if (ENABLE_FEATURE_AIS)
     add_subdirectory(ais)
+else()
+    message(STATUS "Not building ais (ENABLE_FEATURE_AIS=${ENABLE_FEATURE_AIS})")
 endif()
 
 if (ENABLE_FEATURE_ANTENNATOOLS)
     add_subdirectory(antennatools)
+else()
+    message(STATUS "Not building antennatools (ENABLE_FEATURE_ANTENNATOOLS=${ENABLE_FEATURE_ANTENNATOOLS})")
 endif()
 
 if (ENABLE_FEATURE_APRS)
     add_subdirectory(aprs)
+else()
+    message(STATUS "Not building aprs (ENABLE_FEATURE_APRS=${ENABLE_FEATURE_APRS})")
 endif()
 
 if (ENABLE_FEATURE_DEMODANALYZER)
     add_subdirectory(demodanalyzer)
+else()
+    message(STATUS "Not building demodanalyzer (ENABLE_FEATURE_DEMODANALYZER=${ENABLE_FEATURE_DEMODANALYZER})")
 endif()
 
 if (ENABLE_FEATURE_PERTESTER)
     add_subdirectory(pertester)
+else()
+    message(STATUS "Not building pertester (ENABLE_FEATURE_PERTESTER=${ENABLE_FEATURE_PERTESTER})")
 endif()
 
 if (ENABLE_FEATURE_RIGCTLSERVER)
     add_subdirectory(rigctlserver)
+else()
+    message(STATUS "Not building rigctlserver (ENABLE_FEATURE_RIGCTLSERVER=${ENABLE_FEATURE_RIGCTLSERVER})")
 endif()
 
 if (ENABLE_FEATURE_SIMPLEPTT)
     add_subdirectory(simpleptt)
+else()
+    message(STATUS "Not building simpleptt (ENABLE_FEATURE_SIMPLEPTT=${ENABLE_FEATURE_SIMPLEPTT})")
 endif()
 
 if (NOT SERVER_MODE)
     if (ENABLE_FEATURE_SATELLITETRACKER AND SGP4_FOUND AND Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND AND Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND AND Qt${QT_DEFAULT_MAJOR_VERSION}TextToSpeech_FOUND)
         add_subdirectory(satellitetracker)
-    endif()
-    if (ENABLE_FEATURE_JOGDIALCONTROLLER)
-        add_subdirectory(jogdialcontroller)
+    else()
+        message(STATUS "Not building satellitetracker (ENABLE_FEATURE_SATELLITETRACKER=${ENABLE_FEATURE_SATELLITETRACKER} SGP4_FOUND=${SGP4_FOUND} Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND} Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND} Qt${QT_DEFAULT_MAJOR_VERSION}TextToSpeech_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}TextToSpeech_FOUND})")
     endif()
 else()
     if (ENABLE_FEATURE_SATELLITETRACKER AND SGP4_FOUND AND Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND AND Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND)
         add_subdirectory(satellitetracker)
+    else()
+        message(STATUS "Not building satellitetracker (ENABLE_FEATURE_SATELLITETRACKER=${ENABLE_FEATURE_SATELLITETRACKER} SGP4_FOUND=${SGP4_FOUND} Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Positioning_FOUND} Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND})")
     endif()
 endif()
 
-if (Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND)
-    if (ENABLE_FEATURE_RADIOSONDE)
-        add_subdirectory(radiosonde)
-    endif()
-    if (ENABLE_FEATURE_STARTRACKER)
-        add_subdirectory(startracker)
-    endif()
+if (ENABLE_FEATURE_JOGDIALCONTROLLER AND NOT SERVER_MODE)
+    add_subdirectory(jogdialcontroller)
+else()
+    message(STATUS "Not building jogdialcontroller (ENABLE_FEATURE_JOGDIALCONTROLLER=${ENABLE_FEATURE_JOGDIALCONTROLLER} SERVER_MODE=${SERVER_MODE})")
+endif()
+
+if (ENABLE_FEATURE_RADIOSONDE AND Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND)
+    add_subdirectory(radiosonde)
+else()
+    message(STATUS "Not building radiosonde (ENABLE_FEATURE_RADIOSONDE=${ENABLE_FEATURE_RADIOSONDE} Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND})")
+endif()
+
+if (ENABLE_FEATURE_STARTRACKER AND Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND)
+    add_subdirectory(startracker)
+else()
+    message(STATUS "Not building startracker (ENABLE_FEATURE_STARTRACKER=${ENABLE_FEATURE_STARTRACKER} Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND=${Qt${QT_DEFAULT_MAJOR_VERSION}Charts_FOUND})")
 endif()
 
 if (ENABLE_FEATURE_LIMERFE AND ENABLE_LIMESUITE AND LIMESUITE_FOUND)
     add_subdirectory(limerfe)
+else()
+    message(STATUS "Not building limerfe (ENABLE_FEATURE_LIMERFE=${ENABLE_FEATURE_LIMERFE} ENABLE_LIMESUITE=${ENABLE_LIMESUITE} LIMESUITE_FOUND=${LIMESUITE_FOUND})")
 endif()
 
 if (ENABLE_FEATURE_AMBE AND LIBSERIALDV_FOUND)
     add_subdirectory(ambe)
+else()
+    message(STATUS "Not building ambe (ENABLE_FEATURE_AMBE=${ENABLE_FEATURE_AMBE} LIBSERIALDV_FOUND=${LIBSERIALDV_FOUND})")
 endif()
 
 if (ENABLE_FEATURE_REMOTECONTROL)
     add_subdirectory(remotecontrol)
+else()
+    message(STATUS "Not building remotecontrol (ENABLE_FEATURE_REMOTECONTROL=${ENABLE_FEATURE_REMOTECONTROL})")
 endif()
diff --git a/plugins/samplemimo/CMakeLists.txt b/plugins/samplemimo/CMakeLists.txt
index bee67cbfa..c4fb3f6c7 100644
--- a/plugins/samplemimo/CMakeLists.txt
+++ b/plugins/samplemimo/CMakeLists.txt
@@ -2,23 +2,33 @@ project(samplemimo)
 
 if(ENABLE_BLADERF AND LIBBLADERF_FOUND)
     add_subdirectory(bladerf2mimo)
+else()
+    message(STATUS "Not building bladerf2mimo (ENABLE_BLADERF=${ENABLE_BLADERF} LIBBLADERF_FOUND=${LIBBLADERF_FOUND})")
 endif()
 
 if(ENABLE_LIMESUITE AND LIMESUITE_FOUND)
     add_subdirectory(limesdrmimo)
+else()
+    message(STATUS "Not building limesdrmimo (ENABLE_LIMESUITE=${ENABLE_LIMESUITE} LIMESUITE_FOUND=${LIMESUITE_FOUND})")
 endif()
 
 if(ENABLE_XTRX AND LIBXTRX_FOUND)
     add_subdirectory(xtrxmimo)
+else()
+    message(STATUS "Not building xtrxmimo (ENABLE_XTRX=${ENABLE_XTRX} LIBXTRX_FOUND=${LIBXTRX_FOUND})")
 endif()
 
 if(ENABLE_IIO AND LIBIIO_FOUND)
     add_subdirectory(plutosdrmimo)
+else()
+    message(STATUS "Not building plutosdrmimo (ENABLE_IIO=${ENABLE_IIO} LIBIIO_FOUND=${LIBIIO_FOUND})")
 endif()
 
 find_package (Hamlib)
 if(hamlib_FOUND)
     add_subdirectory(audiocatsiso)
+else()
+    message(STATUS "Not building audiocatsiso (hamlib_FOUND=${hamlib_FOUND})")
 endif()
 
 add_subdirectory(metismiso)
diff --git a/plugins/samplesink/CMakeLists.txt b/plugins/samplesink/CMakeLists.txt
index 6821e1511..b895810b7 100644
--- a/plugins/samplesink/CMakeLists.txt
+++ b/plugins/samplesink/CMakeLists.txt
@@ -8,33 +8,49 @@ add_subdirectory(aaroniartsaoutput)
 
 if (CM256CC_FOUND AND (HAS_SSE3 OR HAS_NEON))
     add_subdirectory(remoteoutput)
+else()
+    message(STATUS "Not building remoteoutput (CM256CC_FOUND=${CM256CC_FOUND} HAS_SSE3=${HAS_SSE3} HAS_NEON=${HAS_NEON})")
 endif()
 
 if(ENABLE_BLADERF AND LIBBLADERF_FOUND)
     add_subdirectory(bladerf1output)
     add_subdirectory(bladerf2output)
+else()
+    message(STATUS "Not building bladerf1output or bladerf2output (ENABLE_BLADERF=${ENABLE_BLADERF} LIBBLADERF_FOUND=${LIBBLADERF_FOUND})")
 endif()
 
 if(ENABLE_HACKRF AND LIBHACKRF_FOUND)
     add_subdirectory(hackrfoutput)
+else()
+    message(STATUS "Not building hackrfoutput (ENABLE_HACKRF=${ENABLE_HACKRF} LIBHACKRF_FOUND=${LIBHACKRF_FOUND})")
 endif()
 
 if(ENABLE_LIMESUITE AND LIMESUITE_FOUND)
     add_subdirectory(limesdroutput)
+else()
+    message(STATUS "Not building limesdroutput (ENABLE_LIMESUITE=${ENABLE_LIMESUITE} LIMESUITE_FOUND=${LIMESUITE_FOUND})")
 endif()
 
 if(ENABLE_XTRX AND LIBXTRX_FOUND)
-	add_subdirectory(xtrxoutput)
+    add_subdirectory(xtrxoutput)
+else()
+    message(STATUS "Not building xtrxoutput (ENABLE_XTRX=${ENABLE_XTRX} LIBXTRX_FOUND=${LIBXTRX_FOUND})")
 endif()
 
 if(ENABLE_IIO AND LIBIIO_FOUND)
     add_subdirectory(plutosdroutput)
+else()
+    message(STATUS "Not building plutosdroutput (ENABLE_IIO=${ENABLE_IIO} LIBIIO_FOUND=${LIBIIO_FOUND})")
 endif()
 
 if(ENABLE_SOAPYSDR AND SOAPYSDR_FOUND)
     add_subdirectory(soapysdroutput)
+else()
+    message(STATUS "Not building soapysdroutput (ENABLE_SOAPYSDR=${ENABLE_SOAPYSDR} SOAPYSDR_FOUND=${SOAPYSDR_FOUND})")
 endif()
 
 if(ENABLE_USRP AND UHD_FOUND)
     add_subdirectory(usrpoutput)
+else()
+    message(STATUS "Not building usrpoutput (ENABLE_USRP=${ENABLE_USRP} UHD_FOUND=${UHD_FOUND})")
 endif()
diff --git a/plugins/samplesource/CMakeLists.txt b/plugins/samplesource/CMakeLists.txt
index 8583830cd..dc2ac9a35 100644
--- a/plugins/samplesource/CMakeLists.txt
+++ b/plugins/samplesource/CMakeLists.txt
@@ -6,68 +6,100 @@ add_subdirectory(localinput)
 
 if (CM256CC_FOUND AND (HAS_SSE3 OR HAS_NEON))
     add_subdirectory(remoteinput)
+else()
+    message(STATUS "Not building remoteinput (CM256CC_FOUND=${CM256CC_FOUND} HAS_SSE3=${HAS_SSE3} HAS_NEON=${HAS_NEON})")
 endif()
 
 if(ENABLE_AIRSPY AND LIBAIRSPY_FOUND)
     add_subdirectory(airspy)
+else()
+    message(STATUS "Not building airspy (ENABLE_AIRSPY=${ENABLE_AIRSPY} LIBAIRSPY_FOUND=${LIBAIRSPY_FOUND})")
 endif()
 
 if(ENABLE_AIRSPYHF AND LIBAIRSPYHF_FOUND)
     add_subdirectory(airspyhf)
+else()
+    message(STATUS "Not building airspyhf (ENABLE_AIRSPYHF=${ENABLE_AIRSPYHF} LIBAIRSPYHF_FOUND=${LIBAIRSPYHF_FOUND})")
 endif()
 
 if(ENABLE_BLADERF AND LIBBLADERF_FOUND)
     add_subdirectory(bladerf1input)
     add_subdirectory(bladerf2input)
+else()
+    message(STATUS "Not building bladerf1input or bladerf2input (ENABLE_BLADERF=${ENABLE_BLADERF} LIBBLADERF_FOUND=${LIBBLADERF_FOUND})")
 endif()
 
 if(ENABLE_FUNCUBE AND LIBUSB_FOUND AND HIDAPI_FOUND)
     add_subdirectory(fcdpro)
     add_subdirectory(fcdproplus)
+else()
+    message(STATUS "Not building fcdpro or fcdproplus (ENABLE_FUNCUBE=${ENABLE_FUNCUBE} LIBUSB_FOUND=${LIBUSB_FOUND} HIDAPI_FOUND=${HIDAPI_FOUND})")
 endif()
 
 if(ENABLE_HACKRF AND LIBHACKRF_FOUND)
     add_subdirectory(hackrfinput)
+else()
+    message(STATUS "Not building hackrfinput (ENABLE_HACKRF=${ENABLE_HACKRF} LIBHACKRF_FOUND=${LIBHACKRF_FOUND})")
 endif()
 
 if(ENABLE_LIMESUITE AND LIMESUITE_FOUND)
     add_subdirectory(limesdrinput)
+else()
+    message(STATUS "Not building limesdrinput (ENABLE_LIMESUITE=${ENABLE_LIMESUITE} LIMESUITE_FOUND=${LIMESUITE_FOUND})")
 endif()
 
 if(ENABLE_MIRISDR AND LIBMIRISDR_FOUND)
     add_subdirectory(sdrplay)
+else()
+    message(STATUS "Not building sdrplay (ENABLE_MIRISDR=${ENABLE_MIRISDR} LIBMIRISDR_FOUND=${LIBMIRISDR_FOUND})")
 endif()
 
 if(ENABLE_SDRPLAY AND SDRPLAY_FOUND)
     add_subdirectory(sdrplayv3)
+else()
+    message(STATUS "Not building sdrplayv3 (ENABLE_SDRPLAY=${ENABLE_SDRPLAY} SDRPLAY_FOUND=${SDRPLAY_FOUND})")
 endif()
 
 if(ENABLE_PERSEUS AND LIBPERSEUS_FOUND AND RX_SAMPLE_24BIT)
     add_subdirectory(perseus)
+else()
+    message(STATUS "Not building perseus (ENABLE_PERSEUS=${ENABLE_PERSEUS} LIBPERSEUS_FOUND=${LIBPERSEUS_FOUND} RX_SAMPLE_24BIT=${RX_SAMPLE_24BIT})")
 endif()
 
 if(ENABLE_XTRX AND LIBXTRX_FOUND)
     add_subdirectory(xtrxinput)
+else()
+    message(STATUS "Not building xtrxinput (ENABLE_XTRX=${ENABLE_XTRX} LIBXTRX_FOUND=${LIBXTRX_FOUND})")
 endif()
 
 if(ENABLE_IIO AND LIBIIO_FOUND)
     add_subdirectory(plutosdrinput)
+else()
+    message(STATUS "Not building plutosdrinput (ENABLE_IIO=${ENABLE_IIO} LIBIIO_FOUND=${LIBIIO_FOUND})")
 endif()
 
 if(ENABLE_RTLSDR AND LIBRTLSDR_FOUND)
     add_subdirectory(rtlsdr)
+else()
+    message(STATUS "Not building rtlsdr (ENABLE_RTLSDR=${ENABLE_RTLSDR} LIBRTLSDR_FOUND=${LIBRTLSDR_FOUND})")
 endif()
 
 if(ENABLE_SOAPYSDR AND SOAPYSDR_FOUND)
     add_subdirectory(soapysdrinput)
+else()
+    message(STATUS "Not building soapysdrinput (ENABLE_SOAPYSDR=${ENABLE_SOAPYSDR} SOAPYSDR_FOUND=${SOAPYSDR_FOUND})")
 endif()
 
 if(LIBSIGMF_FOUND)
     add_subdirectory(sigmffileinput)
+else()
+    message(STATUS "Not building sigmffileinput (LIBSIGMF_FOUND=${LIBSIGMF_FOUND})")
 endif()
 
 if(ENABLE_USRP AND UHD_FOUND)
     add_subdirectory(usrpinput)
+else()
+    message(STATUS "Not building usrpinput (ENABLE_USRP=${ENABLE_USRP} UHD_FOUND=${UHD_FOUND})")
 endif()
 
 add_subdirectory(audioinput)
diff --git a/sdrbase/CMakeLists.txt b/sdrbase/CMakeLists.txt
index b34566fb6..0bb193ab4 100644
--- a/sdrbase/CMakeLists.txt
+++ b/sdrbase/CMakeLists.txt
@@ -503,6 +503,10 @@ if(DEFINED OPUS_DEPENDS)
     add_dependencies(sdrbase "${OPUS_DEPENDS}")
 endif()
 
+if(DEFINED LIBSIGMF_DEPENDS)
+    add_dependencies(sdrbase "${LIBSIGMF_DEPENDS}")
+endif()
+
 target_link_libraries(sdrbase
     ${OPUS_LIBRARIES}
     ${sdrbase_FFTW3F_LIB}