if test "x$GCC" = xyes; then
CFLAGS="-std=c89 -pedantic -Wall -Wextra -Werror $CFLAGS"
CFLAGS="-Wno-error=int-to-pointer-cast $CFLAGS"
CPPFLAGS="-D_XOPEN_SOURCE=500 $CPPFLAGS"
# Additional hardening flags.
if test "x$GCC" = xyes; then
CFLAGS="-std=c89 -pedantic -Wall -Wextra -Werror $CFLAGS"
CFLAGS="-Wno-error=int-to-pointer-cast $CFLAGS"
CPPFLAGS="-D_XOPEN_SOURCE=500 $CPPFLAGS"
# Additional hardening flags.