Building expat for nomacs

You will need expat to build exiv2 which is required for building nomacs.

Open CMake GUI
Point where is the source to this directory
Choose a build folder (e.g. expat/build2017-x64)
Hit Configure then Generate
Uncheck BUILD_examples and BUILD_tests
Batch build all projects (2 failed and 8 succeeded is fine)
You should now have an expat.dll in $YOUR_EXPAT_BUILD_PATH$/Release
In the CMakeUserPaths.cmake of your exiv2 project, add these paths:

SET(EXPAT_INCLUDE_DIR "$EXPAT_PATH$/lib")
SET(EXPAT_BUILD_PATH "$EXPAT_BUILD_PATH$")