Hi all, I am trying to install GCC 5.1 version on our system. I followed the instructions on the GCC FAQ page (configure section). The only difference is that due to some restrictions on our system to access Internet, I manually downloaded those three prerequisite packages (GMP, MPFR, and MPC) and untar'ed them into the gcc folder. So, I have something like this: gcc-5.1.0 -> gcc files gcc-5.1.0/gmp -> latest gmp files gcc-5.1.0/mpfr -> latest mpfr files gcc-5.1.0/mpc -> latest mpc files What I am trying to say is that I removed the version numbers to make them visible to gcc build system. This is the configuration command: /home/millad/gcc-5.1.0/configure --prefix=/home/millad/gcc-build/ --enable-languages=c,c++,fortran --disable-bootstrap But, I still get an error about sanitizer: g++: braced spec '%:sanitize(address):%{!shared:libasan_preinit%O%s} %{static-libasan:%{!shared:-Bstatic --whole-archive -lasan --no-whole-archive -Bdynamic}}%{!static-libasan:-lasan}} %{%:sanitize(thread):%{static-libtsan:%{!shared:-Bstatic --whole-archive -ltsan --no-whole-archive -Bdynamic}}%{!static-libtsan:-ltsan}} %{%:sanitize(leak):%{static-liblsan:%{!shared:-Bstatic --whole-archive -llsan --no-whole-archive -Bdynamic}}%{!static-liblsan:-llsan}}' is invalid at '%' Any ideas how to solve this issue? Best Regards, Millad Ghane