%general-entities; ]> Flex Make sure that Flex doesn't try to include headers from /usr/include. cp -v Makefile.in{,.orig} sed "s/-I@includedir@//g" Makefile.in.orig > Makefile.in When Cross Compiling the configure script does not does not determine the correct values for the following, Set the values manually: cat > config.cache << EOF ac_cv_func_malloc_0_nonnull=yes ac_cv_func_realloc_0_nonnull=yes EOF Prepare Flex for compilation: ./configure --build=${CLFS_HOST} --host=${CLFS_TARGET} \ --prefix=/usr --cache-file=config.cache Compile the package: make CC="${CC} -fPIC" libfl.a make Install the package: make DESTDIR=${CLFS} install There are some packages that expect to find the lex library in /usr/lib. Create a symlink to account for this: ln -sfv libfl.a ${CLFS}/usr/lib/libl.a A few programs do not know about flex yet and try to run its predecessor, lex. To support those programs, create a wrapper script named lex that calls flex in lex emulation mode: cat > ${CLFS}/usr/bin/lex << "EOF" #!/bin/sh # Begin /usr/bin/lex exec /usr/bin/flex -l "$@" # End /usr/bin/lex EOF chmod -v 755 ${CLFS}/usr/bin/lex Installed programs Installed library flex and lex libfl.a libfl_pic.a Short Descriptions flex A tool for generating programs that recognize patterns in text; it allows for the versatility to specify the rules for pattern-finding, eradicating the need to develop a specialized program flex lex A script that runs flex in lex emulation mode lex libfl.a The flex library libfl.a