make BOOT_LDFLAGS=-static: This is the equivalent to make LDFLAGS=-static as we use with other packages to compile them statically. --prefix=/static: This is NOT a typo. GCC hard codes some paths while compiling and so we need to pass /static as the prefix during ./configure. We pass the real install prefix during the make install command later. --enable-languages=c: This builds the C compiler. The C++ compiler will be built in chapter 6, when we rebuild GCC. Other compilers are available as well. If they are needed, the --enable-languages parameter may be omitted. --enable-threads=posix: This enables C++ exception handling for multithreaded code. echo "#define HAVE_GAS_HIDDEN 1": This defines the .hidden assembler directive so that we don't build a faulty Glibc later on. ln -s gcc $LFS/static/bin/cc: This creates the $LFS/static/bin/gcc symlink which some packages need.