%general-entities; ]> Flex temporary system When cross compiling, the configure script 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 M4=m4 ./configure --prefix=/tools \ --build=${CLFS_HOST} --host=${CLFS_TARGET} \ --cache-file=config.cache