Makefile hierarchy: CFLAGS override-ability actually works now The original version was broken in that CFLAGS=${CFLAGS} passing was done without quotes, which breaks as soon as there is a space in the user-set CFLAGS. Changing it to CFLAGS="${CFLAGS}" makes it work as originally intended.

/*
 * Our own definition of u8/u16/u32
 */

typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;