Just an FYI...
If you are building on Windows with the latest CYGWIN (or have ever built with CYGWIN) watch out for
abort: The filename, directory name, or volume label syntax is incorrect
It probably means that CYGWIN has managed to create a directory with the name C:
Some of the CYGWIN utilities will treat the pattern "C:/" as the name of a relative directory and create one, which then confuses other utilities that think it is the root of drive C: C:^(
-kto