I'm having the same issue as the previous poster had back in January, namely that configuring with --enable-languages='c,c++,fortran,go,jit,lto' --enable-host-shared fails. Tried going into the ISL build directory, distclean-ing it and reconfiguring with --enable-host-shared, but this in turn led to the realization that gmp is also configured carelessly: $ grep " \$.*/configure " config.log $ /data/pszilard/gcc.git/gmp/configure --srcdir=../../gcc.git/gmp --cache-file=./config.cache --prefix=/opt/tcbsys/gcc/git-39eba41 --enable-host-shared --enable-languages=c,c++,fortran,go,jit,lto --program-transform-name=s,y,y, --disable-option-checking --build=x86_64-linux-gnu --host=none-pc-linux-gnu --target=none-pc-linux-gnu --disable-intermodule --enable-checking=yes,types --disable-coverage --enable-languages=c,c++,lto --disable-build-format-warnings --disable-shared LEX=touch lex.yy.c Any plans to fix this? Do I have another choice except either tracking down all misconfigured dependencies or disabling ISL? Cheers, -- Szilárd