Dear Administrator, I tried installing GCC libraries, but it does not seem to work. I do not understand the problem why. This is the output from my Terminal window: 1282816:~ kfalk$ cd Desktop/ 1282816:Desktop kfalk$ cd gcc-4.8.2/ 1282816:gcc-4.8.2 kfalk$ ./configure checking build system type... x86_64-apple-darwin12.4.0 checking host system type... x86_64-apple-darwin12.4.0 checking target system type... x86_64-apple-darwin12.4.0 checking for a BSD-compatible install... /usr/bin/install -c checking whether ln works... yes checking whether ln -s works... yes checking for a sed that does not truncate output... /usr/bin/sed checking for gawk... no checking for mawk... no checking for nawk... no checking for awk... awk checking for libatomic support... yes checking for libitm support... yes checking for libsanitizer support... yes checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for g++... g++ checking whether we are using the GNU C++ compiler... yes checking whether g++ accepts -g... yes checking whether g++ accepts -static-libstdc++ -static-libgcc... no checking for gnatbind... no checking for gnatmake... no checking whether compiler driver understands Ada... no checking how to compare bootstrapped objects... cmp --ignore-initial=16 $$f1 $$f2 checking for objdir... .libs checking for the correct version of gmp.h... no configure: error: Building GCC requires GMP 4.2+, MPFR 2.4.0+ and MPC 0.8.0+. Try the --with-gmp, --with-mpfr and/or --with-mpc options to specify their locations. Source code for these libraries can be found at their respective hosting sites as well as at ftp://gcc.gnu.org/pub/gcc/infrastructure/. See also http://gcc.gnu.org/install/prerequisites.html for additional info. If you obtained GMP, MPFR and/or MPC from a vendor distribution package, make sure that you have installed both the libraries and the header files. They may be located in separate packages. Is there anything specific I can install like the mentioned GMP, or else? Many thanks! Katerina