Hung-Hsun Su <su@xxxxxxxxxxx> writes: > It is tellling me that it cannot find libmpfr.so when compiling > conftest.c You need to ensure that it can. If you have built MPFR yourself, I strongly recommend that you discard what you built and rebuild it using --disable-shared. Otherwise, you need to ensure that the dynamic linker can find libmpfr.so one way or another; one simple way would be to set the LD_LIBRARY_PATH environment variable to point to the right library. Or you may simply need to run ldconfig. > Are these tests critical for the installation? Yes. Ian