Having troubles compiling C# 6 using MsBuild -

i need compile source code, i've contacted creator of code , told me this:

"you need roslyn compiler, since it's written in c# 6.0."

i've got roslyn compiler , can't manage make work and/or compile anything

i've tried use msbuild vs 2015 but, unfortunally, w/out success (as lot of compiling errors)

if wondering i'm trying compile,here's github https://github.com/frostycpu/finalesfunkeln

i hope can find solution :)

edit: here's screenshot of console:

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i'm using italian version of windows, if need translations ask me anything

my guess have piece of software on machine defined "platform" environment variable, "helpfully" setting "hpd". msbuild picks environment variable , trying build hpd platform not defined in solution.

the workaround build msbuild /p="any cpu". uninstall software or delete environment variable, obvious caveat knows software without that.