Environment: APPVEYOR_BUILD_WORKER_IMAGE=Visual Studio 2015, COMPILER=cl.exe, MSVC_BAT=C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat, MSVC_BAT_ARCH=x86, GENERATOR=Visual Studio 14 2015 Win64, APPVEYOR_SAVE_CACHE_ON_ERROR=true, DLL_PATH=lib\Release\fec.dll