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