I'm using LFS with Linux-Libc-Headers
(http://ep09.pld-linux.org/~mmazur/linux-libc-headers/linux-libc-headers-2.6.12.0.tar.bz2)
I can build xorg 6.8.2 successfully but when trying xorg-x11-6.8.99.904 I get
this errors:

 lnx_agp.c
In file included from lnx_agp.c:24:
/usr/include/linux/agpgart.h:55: error: parse error before "__u16"
/usr/include/linux/agpgart.h:60: error: field `version' has incomplete type
/usr/include/linux/agpgart.h:61: error: parse error before "__u32"
/usr/include/linux/agpgart.h:68: error: parse error before '}' token
/usr/include/linux/agpgart.h:71: error: parse error before "__u32"
/usr/include/linux/agpgart.h:92: error: parse error before "__u32"
/usr/include/linux/agpgart.h:106: error: parse error before "__u32"
lnx_agp.c: In function `GARTInit':
lnx_agp.c:65: error: storage size of 'agpinf' isn't known
lnx_agp.c:65: warning: unused variable `agpinf'
lnx_agp.c: In function `xf86GetAGPInfo':
lnx_agp.c:129: error: storage size of 'agpinf' isn't known
lnx_agp.c:129: warning: unused variable `agpinf'
lnx_agp.c: In function `xf86AllocateGARTMemory':
lnx_agp.c:221: error: storage size of 'alloc' isn't known
lnx_agp.c:221: warning: unused variable `alloc'
lnx_agp.c: In function `xf86UnbindGARTMemory':
lnx_agp.c:324: error: storage size of 'unbind' isn't known
lnx_agp.c:324: warning: unused variable `unbind'
lnx_agp.c: In function `xf86EnableAGP':
lnx_agp.c:356: error: parse error before "setup"
lnx_agp.c:361: error: `setup' undeclared (first use in this function)
lnx_agp.c:361: error: (Each undeclared identifier is reported only once
lnx_agp.c:361: error: for each function it appears in.)
make[7]: *** [lnx_agp.o] Error 1
make[7]: Leaving directory
`/sources/xc/programs/Xserver/hw/xfree86/os-support/linux'
make[6]: *** [linux] Error 2
make[6]: Leaving directory `/sources/xc/programs/Xserver/hw/xfree86/os-support'
make[5]: *** [all] Error 2
make[5]: Leaving directory `/sources/xc/programs/Xserver/hw/xfree86'
make[4]: *** [hw/xfree86] Error 2
make[4]: Leaving directory `/sources/xc/programs/Xserver'
make[3]: *** [all] Error 2
make[3]: Leaving directory `/sources/xc/programs'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/sources/xc'