compilation error in branch and master

[Uwe Stöhr]

compiling today's 2.2.x branch and master I get this compilation error:
  environment.cpp
D:\LyXGit\Master\src\support\environment.cpp(73): fatal error C1189: 
#error:  No environment-setting function has been defined. 
[D:\LyXGit\Master\compile-2015\src\support\support.vcxproj]

regards Uwe