This package is known to behave badly when you have changed its default optimization flags (including the -march and -mcpu options). Therefore, if you have defined any environment variables that override default optimizations, such as CFLAGS and CXXFLAGS, we recommend unsetting or modifying them when building GCC. patch -Np1 -i ../gcc-2.95.3-2.patch echo timestamp > gcc/cstamp-h.in mkdir ../gcc-2-build cd ../gcc-2-build ../gcc-2.95.3/configure --prefix=/opt/gcc-2.95.3 \     --enable-shared --enable-languages=c make bootstrap make install