This package is known to behave badly when you have changed it's default optimization flags (including the -march and -mcpu options). GCC is best left alone, so we recommend you unsetting CFLAGS, CXXFLAGS and other such variables/settings that would change the default optimization that it comes with. Install GCC by running the following commands. These commands will build the C and C++ compiler. Other compilers are available within the gcc package. If you want to build all the other availble compilers too, leave out the --enable-languages=c,c++ option in the configure command. See the GCC documentation for more details on which additional compilers are available. Note: the build of other compilers is not tested by the people who actively work on LFS. patch -Np1 -i ../gcc-&gcc-patch-version;.patch && mkdir ../gcc-build && cd ../gcc-build && ../gcc-&gcc-version;/configure --prefix=/usr --enable-shared \    --enable-languages=c,c++ --enable-threads && make bootstrap && make install