[CMake] ExternalProject BUILD_COMMAND and Visual Studio Express 2010

[Macumber, Daniel]

Our project is using ExternalProject_Add to build Ruby.  Our BUILD_COMMAND on Windows is "cd ${CMAKE_BINARY_DIR}/Ruby-prefix/src/Ruby-build && nmake".  This works using the professional versions of Visual Studio.  However, using Visual Studio Express 2010 I get an error that nmake is not a known program.  Nmake is not in my system path but is found when running the Visual Studio command prompt.  How can I get the ExternalProject build command to use the correct environment?  Should I put a call to vcvarsall.bat in the command line?  Is there a CMake variable that has the path to that?

Thanks a lot,
Dan
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