diff --git a/.gitignore b/.gitignore
index 80e3c4b27..8a21e3b72 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@ jnq*
 *.txt
 *.bak
 !**/CMakeLists.txt
+!**/*.txt
 __pycache__
 cmake-build-debug
 cmake-build-release
diff --git a/doc/building-Boost-libs.txt b/doc/building-Boost-libs.txt
new file mode 100644
index 000000000..1c418bfc6
--- /dev/null
+++ b/doc/building-Boost-libs.txt
@@ -0,0 +1,227 @@
+Linux
+=====
+
+sudo apt install libboost-all-dev
+
+
+macOS
+=====
+
+Download the latest Boost sources from here: boost.org
+
+Currently v 1.74.0 - https://dl.bintray.com/boostorg/release/1.74.0/source/boost_1_74_0.tar.bz2
+
+cd ~/Downloads
+curl -L -O https://dl.bintray.com/boostorg/release/1.74.0/source/boost_1_74_0.tar.bz2
+mkdir src
+cd !$
+tar --bzip2 -xf boost_1_74_0.tar.bz2
+cd boost_1_74_0/tools/build
+bootstrap.sh
+./b2 toolset=clang --prefix=~/local/boost-build install
+cd ../..
+~/local/boost-build/bin/b2 -j8 toolset=clang cflags=-mmacosx-version-min=10.12 \
+   cxxflags=-mmacosx-version-min=10.12 mflags=-mmacosx-version-min=10.12 \
+   mmflags=-mmacosx-version-min=10.12 mflags=-mmacosx-version-min=10.12 \
+   linkflags=-mmacosx-version-min=10.12 \
+   architecture=x86 address-model=64 --prefix=~/local/boost install
+
+That will take a while, once successful (warnings can be ignored) you can clean the build tree to save some space:
+
+~/local/boost-build/bin/b2 toolset=clang cflags=-mmacosx-version-min=10.12 \
+   cxxflags=-mmacosx-version-min=10.12 mflags=-mmacosx-version-min=10.12 \
+   mmflags=-mmacosx-version-min=10.12 mflags=-mmacosx-version-min=10.12 \
+   linkflags=-mmacosx-version-min=10.12 \
+   architecture=x86 address-model=64 --prefix=~/local/boost clean
+
+All that remains is to reconfigure your WSJT-X build trees to include ~/local/boost in your CMAKE_PREFIX_PATH, maybe something like these (one each for Debug and Release configuration builds and assumes the Macports GCC v7 tool-chain is being used):
+
+FC=gfortran-mp-7 \
+   cmake \
+   -D CMAKE_PREFIX_PATH:PATH=~/local/boost\;~/Qt/5.15.0-clang\;~/local/hamlib/release\;/opt/local \
+   -D CMAKE_INSTALL_PREFIX=~/local/wsjtx/release \
+   -D CMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk \
+   -D CMAKE_BUILD_TYPE=Release \
+   -B ~/build/wsjtx-release \
+   ~/src/bitbucket.org/k1jt/wsjtx
+
+FC=gfortran-mp-7 \
+   cmake \
+   -D CMAKE_PREFIX_PATH:PATH=~/local/boost\;~/Qt/5.15.0-clang\;~/local/hamlib/debug\;/opt/local \
+   -D CMAKE_INSTALL_PREFIX=~/local/wsjtx/debug \
+   -D CMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk \
+   -D CMAKE_BUILD_TYPE=Debug \
+   -B ~/build/wsjtx-debug \
+   ~/src/bitbucket.org/k1jt/wsjtx
+
+Substitute you installed SDK version, Qt version and location, and Hamlib install locations.
+
+
+MS Windows
+==========
+
+Because 32-bit and 64-bit builds are possible and each use different
+tool-chains, two separate builds are necessary if both architectures
+are required.
+
+Common steps
+------------
+
+Download and extract the latest Boost library sources, at the time of
+writing that was
+https://dl.bintray.com/boostorg/release/1.74.0/source/boost_1_74_0.7z
+. Extract to some convenient location, I use %HOME%\src .
+
+Download and extract the libbacktrace sources from
+https://github.com/ianlancetaylor/libbacktrace as follows.
+
+cd %HOME%\src
+mkdir github.com
+cd github.com
+mkdir ianlancetaylor
+cd ianlancetaylor
+git clone git@github.com:ianlancetaylor/libbacktrace.git
+
+I install third-party tools under the C:\Tools directory, the
+following assumes that, adjust to taste. Note that it is OK to install
+both 32- and 64-bit builds of Boost to the same path as the library
+names are unique per architecture and tool-chain. This saves a lot of
+space as the boost header files are quite big, and there's no need to
+install multiple copies.
+
+Create a new file %HOME%\src\boost_1_74_0\project-config.jam with the
+following three lines to specify how Boost.Build finds the libbacktrace
+library matched to your relevant C++ compliers:
+
+import toolset ;
+
+using gcc : : C:\\Qt\\Tools\\mingw730_32\\bin\\g++ : <compileflags>-I"C:\\Tools\\libbacktrace-1.0\\MinGW32\\include" <linkflags>-L"C:\\Tools\\libbacktrace-1.0\\MinGW32\\lib" ;
+
+using gcc : 8~64 : C:\\Qt\\Tools\\mingw810_64\\bin\\g++ : <compileflags>-I"C:\\Tools\\libbacktrace-1.0\\MinGW64\\include" <linkflags>-L"C:\\Tools\\libbacktrace-1.0\\MinGW64\\lib" ;
+
+Note that it may need some local adjustment of the C++ compiler
+version and path depending on the exact tool-chains from your Qt
+installation. Above I am using the Qt v5.12.9 MinGW32 v7 tool-chain
+for 32-bit (toolset=gcc), and Qt v5.15.0 MinGW64 v8 tool-chain
+for 64-bit (toolchain=gcc-8~64).
+
+32-bit
+------
+
+Start an MSys or MSys2 shell with the 32-bit C/C++ tool-chain from
+your Qt installation on the PATH environment variable.
+
+cd ~/src/github.com/ianlancetaylor/libbacktrace
+./configure --prefix=/c/Tools/libbacktrace-1.0/MinGW32
+make && make install
+make clean
+
+Start a CMD window suitably configured for use of the 32-bit MinGW
+tool-chain bundled with your Qt binary installation. Verify the
+correct compiler is in the PATH. i.e. it identifies (g++ --version) as
+i686-posix-dwarf-rev0.
+
+cd %HOME%\src\boost_1_74_0\tools\build
+bootstrap.bat
+.\b2 --prefix=C:\Tools\boost-build\MinGW32 install
+cd ..\..
+C:\Tools\boost-build\MinGW32\bin\b2 -j8 toolset=gcc ^
+  --build-dir=%HOME%\build\boost ^
+  --build-type=complete --prefix=C:\Tools\boost install
+
+If all is well you should see the following line about a 1/3 of the
+way through the initial configuration steps.
+
+   - libbacktrace builds      : yes
+
+After some time it should complete with something like:
+
+...failed updating 1574 targets...
+...skipped 1112 targets...
+...updated 3924 targets...
+
+warnings can usually be ignored. If successful; you can release some
+space by cleaning the build tree:
+
+C:\Tools\boost-build\MinGW32\bin\b2 toolset=gcc ^
+  --build-dir=%HOME%\build\boost ^
+  --build-type=complete clean
+
+64-bit
+======
+
+Start an MSys or MSys2 shell with the 64-bit C/C++ tool-chain from
+your Qt installation on the PATH environment variable.
+
+cd ~/src/github.com/ianlancetaylor/libbacktrace
+./configure --prefix=/c/Tools/libbacktrace-1.0/MinGW64
+make && make install
+make clean
+
+Start a CMD window suitably configured for use of the 64-bit MinGW
+tool-chain bundled with your Qt binary installation. Verify the
+correct compiler is in the PATH. i.e. it identifies (g++ --version) as
+x86_64-posix-seh-rev0. Note the toolchain specified must match your
+compilers and the project-config.jam file you created above. With a v7
+64-bit C++ compiler use gcc-7~64, with a v8 64-bit C++ compiler use
+gcc-8~64. My example matches my 64-bit Qt v5.15.0 with the bundled
+MinGW64 v8.1.0.
+
+cd %HOME%\src\boost_1_74_0\tools\build
+bootstrap.bat
+.\b2 --prefix=C:\Tools\boost-build\MinGW64 install
+cd ..\..
+C:\Tools\boost-build\MinGW64\bin\b2 -j8 toolset=gcc-8~64 ^
+  address-model=64 --build-dir=%HOME%\build\boost ^
+  --build-type=complete --prefix=C:\Tools\boost install
+
+If all is well you should see the following line about a 1/3 of the
+way through the initial configuration steps.
+
+   - libbacktrace builds      : yes
+
+After some time it should complete with something like:
+
+...failed updating 108 targets...
+...skipped 32 targets...
+...updated 3648 targets...
+
+warnings can usually be ignored. If successful; you can release some
+space by cleaning the build tree:
+
+C:\Tools\boost-build\MinGW32\bin\b2 toolset=gcc-8~64 ^
+  address-model=64 --build-dir=%HOME%\build\boost ^
+  --build-type=complete clean
+
+Setting up WSJT-X builds
+------------------------
+
+All that remains is to add C:\Tools\boost\ to your 32- and 64-bit
+build configurations CMAKE_PREFIX_PATH variables. I use tool-chain
+files for my WSJT-X builds on Windows, an extract from my 32-bit Debug
+configuration tool-chain file:
+
+# ...
+
+set (BOOSTDIR C:/Tools/boost)
+set (QTDIR C:/Qt/5.12.9/mingw73_32)
+# set (QTDIR C:/Qt/5.15.0/mingw81_32)
+set (FFTWDIR C:/Tools/fftw-3.3.5-dll32)
+set (HAMLIBDIR C:/test-install/hamlib/mingw32/debug)
+set (LIBUSBDIR C:/Tools/libusb-1.0.23)
+set (PYTHONDIR C:/Python27)
+set (ASCIIDOCDIR C:/Tools/asciidoc-master)
+
+# where to find required packages
+set (CMAKE_PREFIX_PATH ${BOOSTDIR} ${QTDIR} ${FFTWDIR} ${HAMLIBDIR} ${HAMLIBDIR}/bin ${LIBUSBDIR} ${PYTHONDIR} ${ASCIIDOCDIR})
+
+# ...
+
+Run-time Environment
+--------------------
+
+You will need to add C:\Tools\boost\lib to your PATH environment
+variable in order to run installed Debug configurations of WSJT-X, or
+to execute build artefacts from a build tree. Installed Release
+configurations will move any required DLLs to the installation bin
+directory automatically.