How about:
if(EXISTS "$ENV{VS110COMNTOOLS}../../VC")
get_filename_component(VC11_DIR "$ENV{VS110COMNTOOLS}../../VC"
ABSOLUTE)
endif()
if(EXISTS "$ENV{VS120COMNTOOLS}../../VC")
get_filename_component(VC12_DIR "$ENV{VS120COMNTOOLS}../../VC"
ABSOLUTE)
endif()
message(STATUS "VC11_DIR='${VC11_DIR}'")
message(STATUS "VC12_DIR='${VC12_DIR}'")
HTH,
David C.
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