I noticed this when compiling on and x86-64 machine (I actually don't think
that's relevant though, I bet it's an old-gcc thing).

 gcc -DHAVE_CONFIG_H -I. -I. -I../.. -I../.. -I. -g -O2 -MT fbpict.lo -MD -MP -M
F .deps/fbpict.Tpo -c fbpict.c  -fPIC -DPIC -o .libs/fbpict.o
In file included from fbpict.c:34:
fbmmx.h:38:1: warning: "fbHaveMMX" redefined
In file included from pixman.h:94,
                 from icint.h:30,
                 from pixman-xserver-compat.h:47,
                 from fbpict.c:29:
pixman-remap.h:35:1: warning: this is the location of the previous definition