This is with r195682, on Mac OS X 12.2.1. I have the SVN source tree in $source, and I have GMP 5.1.0, MPFR 3.1.1, and MPC 1.0.1 symlinked to $source/gmp, mpfr and mpc respectively. Having built the compiler in $build (a parallel directory), make check-gmp and make check-mpfr run successfully. However, make check-mpc fails to build with /bin/sh ../libtool --tag=CC --mode=link gcc -g -O2 -no-install -o tabs tabs.o libmpc-tests.la ../src/libmpc.la -lmpfr -lgmp libtool: link: warning: `-no-install' is ignored for x86_64-apple-darwin12 libtool: link: warning: assuming `-no-fast-install' instead libtool: link: gcc -g -O2 -o tabs tabs.o ./.libs/libmpc-tests.a ../src/.libs/libmpc.a -lmpfr /Users/simon/tmp/gcc-build-195682-patched/./gmp/.libs/libgmp.a ld: library not found for -lmpfr If I cd $build/mpc/test and make check, it runs successfully. I believe that the problem is that the LDFLAGS set in $build/mpc/test/Makefile is being overridden.