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make[4]: execvp: /d/programs/mozilla-build/moztools/bin/nsinstall: Bad file number make[4]: *** [export] Error 127 make[4]: Leaving directory `/d/src/moz-hg/fx-trunk-optimized/config' make[3]: *** [export_tier_base] Error 2 make[3]: Leaving directory `/d/src/moz-hg/fx-trunk-optimized' make[2]: *** [tier_base] Error 2 make[2]: Leaving directory `/d/src/moz-hg/fx-trunk-optimized' make[1]: *** [default] Error 2 make[1]: Leaving directory `/d/src/moz-hg/fx-trunk-optimized' make: *** [build] Error 2

In a Windows build this error is the result of not compiling as an administrator. Make sure you are using an elevated command prompt in Windows Vista or start MSYS command prompt as an administrator.