diff --git a/Readme.md b/Readme.md
index d094e0bac..7feabe017 100644
--- a/Readme.md
+++ b/Readme.md
@@ -167,10 +167,16 @@ If you are not comfortable with this just do not install DSDcc and/or mbelib and
   - For Linux distributions: `plugins/channel/libdemoddsd.so`
   - For Windows distribution: `dsdcc.dll`, `mbelib.dll`, `plugins\channel\demoddsd.dll`
 
-<h1>Software distributions</h1>
+<h1>Binary distributions</h1>
 
-In the [releases](https://github.com/f4exb/sdrangel/releases) section one can find binary distributions for Windows
+In the [releases](https://github.com/f4exb/sdrangel/releases) section of the Github repository one can find binary distributions for Ubuntu and Windows
 
-This is the archive of the complete binary distribution that expands to the `sdrangel` directory. You can install it anywhere you like and click on `sdrangel.exe` to start.
+<h2>Ubuntu</h2>
+
+The `.deb` file is a Debian package that can be installed with `sudo apt-get install` command. Occasionnally you may have to force the installation of dependencies with the `sudo apt-get install -f` command.
+
+<h2>Windows</h2>
+
+The `.7z` file is a [7Zip](https://www.7-zip.org/) archive of the complete binary distribution that expands to the `sdrangel` directory. You can install it anywhere you like and double click on `sdrangel.exe` to start.
 
 <b>&#9888; Windows distribution is provided as a by product thanks to the Qt toolchain. The platform of choice to run SDRangel is definitely Linux and very little support can be given for this Windows distribution.</b>
diff --git a/devices/perseus/CMakeLists.txt b/devices/perseus/CMakeLists.txt
index 1cf08b9ce..1858709d7 100644
--- a/devices/perseus/CMakeLists.txt
+++ b/devices/perseus/CMakeLists.txt
@@ -19,6 +19,10 @@ add_library(perseusdevice SHARED
     ${perseusdevice_SOURCES}
 )
 
+if(ENABLE_EXTERNAL_LIBRARIES)
+    add_dependencies(perseusdevice perseus)
+endif()
+
 set_target_properties(perseusdevice
     PROPERTIES DEFINE_SYMBOL "devices_EXPORTS")
 
diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index d2d4d296f..984be330d 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -17,6 +17,7 @@ set(LIMESUITE_TAG "v19.01.0")
 set(BLADERF_TAG 896d2431b3a35a4b31b6e729386202ebf5fdc5c0)
 set(LIBIIO_TAG 826563e41b5ce9890b75506f672017de8d76d52d)
 set(AIRSPYHF_TAG "1.1.5")
+set(PERSEUS_TAG afefa23e3140ac79d845acb68cf0beeb86d09028)
 
 
 # For some external project macros
@@ -245,19 +246,24 @@ if (LINUX)
     set(LIBAIRSPYHF_INCLUDE_DIR "${source_dir}/.." CACHE INTERNAL "")
     set(LIBAIRSPYHF_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib/libairspyhf.so" CACHE INTERNAL "")
     makeLink("${source_dir}/libairspyhf/src" "${source_dir}/../libairspyhf" airspyhf)
+
+    # needs pkgconfig, libusb, autoconf, automake and libtool
+    ExternalProject_Add(perseus
+        GIT_REPOSITORY https://github.com/f4exb/libperseus-sdr.git
+        GIT_TAG ${PERSEUS_TAG}
+        PREFIX "${EXTERNAL_BUILD_LIBRARIES}/perseus"
+        CMAKE_ARGS ${DEFAULT_OUTPUT_DIRECTORY}
+        INSTALL_COMMAND ""
+        TEST_COMMAND ""
+    )
+    set(LIBPERSEUS_FOUND ON CACHE INTERNAL "")
+    set(LIBPERSEUS_INCLUDE_DIR "${EXTERNAL_BUILD_LIBRARIES}/perseus/src/perseus" CACHE INTERNAL "")
+    set(LIBPERSEUS_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib/libperseus-sdr.so" CACHE INTERNAL "")
 endif()
 
 # already on the respository
 # TODO decide what to do
 if(OFF)
-# needs pkgconfig, libusb, autoconf, automake and libtool
-ExternalProject_Add(perseus
-    GIT_REPOSITORY https://github.com/f4exb/libperseus-sdr.git
-    GIT_TAG afefa23e3140ac79d845acb68cf0beeb86d09028
-    PREFIX "${EXTERNAL_BUILD_LIBRARIES}/perseus"
-    INSTALL_COMMAND ""
-    TEST_COMMAND ""
-)
 # apt install libcodec2-dev
 # needs speexdsp
 ExternalProject_Add(codec2
diff --git a/plugins/samplesource/perseus/CMakeLists.txt b/plugins/samplesource/perseus/CMakeLists.txt
index a11cc1d73..931d1cdfa 100644
--- a/plugins/samplesource/perseus/CMakeLists.txt
+++ b/plugins/samplesource/perseus/CMakeLists.txt
@@ -48,6 +48,10 @@ add_library(${TARGET_NAME} SHARED
 	${perseus_SOURCES}
 )
 
+if(ENABLE_EXTERNAL_LIBRARIES)
+    add_dependencies(${TARGET_NAME} perseus)
+endif()
+
 target_link_libraries(${TARGET_NAME}
         Qt5::Core
         ${TARGET_LIB}