I am assuming this is on fermat.

The problem seems to be that libmpfr.so.4 is found in /usr/local/lib, but that libgmp.so.11 which also lives in /usr/local/lib, is not found:

jdemeyer@fermat:~$ ldd /usr/lib/gcc/x86_64-linux-gnu/4.6/cc1
        linux-vdso.so.1 =>  (0x00007fff55c41000)
libmpc.so.2 => /usr/lib/x86_64-linux-gnu/libmpc.so.2 (0x00007fb127dbc000)
        libmpfr.so.4 => /usr/local/lib/libmpfr.so.4 (0x00007fb127b61000)
libgmp.so.10 => /usr/lib/x86_64-linux-gnu/libgmp.so.10 (0x00007fb1278f2000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fb1276ee000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fb1274d7000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fb127117000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fb127fe7000)
        libgmp.so.11 => not found

This is because /usr/local/lib/libmpfr.so.4 is in the ld.so.cache but /usr/local/lib/libgmp.so.11 is not. I don't know why this is the case.

jdemeyer@fermat:~$ ldconfig -p |grep libgmp
libgmpxx.so.4 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libgmpxx.so.4
        libgmpxx.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libgmpxx.so
libgmp.so.10 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libgmp.so.10
        libgmp.so.3 (libc6,x86-64) => /usr/lib/libgmp.so.3
        libgmp.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libgmp.so
jdemeyer@fermat:~$ ldconfig -p |grep libmpfr
        libmpfrcx.so.1 (libc6,x86-64) => /usr/local/lib/libmpfrcx.so.1
        libmpfrcx.so (libc6,x86-64) => /usr/local/lib/libmpfrcx.so
        libmpfr.so.4 (libc6,x86-64) => /usr/local/lib/libmpfr.so.4
libmpfr.so.4 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libmpfr.so.4
        libmpfr.so.1 (libc6,x86-64) => /usr/lib/libmpfr.so.1
        libmpfr.so (libc6,x86-64) => /usr/local/lib/libmpfr.so
        libmpfr.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libmpfr.so

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