xserver build failed on master with below error:
-------------------------------------------------------------------
dri2.c:60: error: expected specifier-qualifier-list before 'drmBO'
dri2.c: In function 'DRI2ScreenAllocEvent':
dri2.c:86: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:90: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:90: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:93: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:93: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:95: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:95: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:97: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:100: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:100: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:101: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c: In function 'DRI2ScreenCommitEvents':
dri2.c:109: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:109: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c: In function 'DRI2PostBufferAttach':
dri2.c:195: error: 'struct _DRI2Screen' has no member named 'getPixmapHandle'
dri2.c: In function 'DRI2ClipNotify':
dri2.c:217: error: 'struct _DRI2Screen' has no member named 'locked'
dri2.c:218: error: 'struct _DRI2Screen' has no member named 'beginClipNotify'
dri2.c:219: error: 'struct _DRI2Screen' has no member named 'locked'
dri2.c:222: error: 'struct _DRI2Screen' has no member named 'ClipNotify'
dri2.c:223: error: 'struct _DRI2Screen' has no member named 'ClipNotify'
dri2.c: In function 'DRI2HandleExposures':
dri2.c:238: error: 'struct _DRI2Screen' has no member named 'HandleExposures'
dri2.c:239: error: 'struct _DRI2Screen' has no member named 'HandleExposures'
dri2.c:246: error: 'struct _DRI2Screen' has no member named 'locked'
dri2.c:247: error: 'struct _DRI2Screen' has no member named 'endClipNotify'
dri2.c:248: error: 'struct _DRI2Screen' has no member named 'locked'
dri2.c: In function 'DRI2CloseScreen':
dri2.c:257: error: 'struct _DRI2Screen' has no member named 'ClipNotify'
dri2.c:258: error: 'struct _DRI2Screen' has no member named 'HandleExposures'
dri2.c:260: warning: implicit declaration of function 'drmBOUnmap'
dri2.c:260: warning: nested extern declaration of 'drmBOUnmap'
dri2.c:260: error: 'struct _DRI2Screen' has no member named 'sareaBO'
dri2.c:261: warning: implicit declaration of function 'drmBOUnreference'
dri2.c:261: warning: nested extern declaration of 'drmBOUnreference'
dri2.c:261: error: 'struct _DRI2Screen' has no member named 'sareaBO'
dri2.c: In function 'DRI2CreateDrawable':
dri2.c:295: error: 'struct _DRI2Screen' has no member named 'nextHandle'
dri2.c:300: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c: In function 'DRI2ReemitDrawableInfo':
dri2.c:344: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c: In function 'DRI2Connect':
dri2.c:361: error: 'struct _DRI2Screen' has no member named 'driverName'
dri2.c:362: error: 'struct _DRI2Screen' has no member named 'sareaBO'
dri2.c: In function 'DRI2GetPixmapHandle':
dri2.c:383: error: 'struct _DRI2Screen' has no member named 'getPixmapHandle'
dri2.c: In function 'DRI2SetupSAREA':
dri2.c:393: error: 'struct _DRI2Screen' has no member named 'sareaSize'
dri2.c:394: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:401: warning: implicit declaration of function 'drmBOCreate'
dri2.c:401: warning: nested extern declaration of 'drmBOCreate'
dri2.c:401: error: 'struct _DRI2Screen' has no member named 'sareaSize'
dri2.c:401: error: 'struct _DRI2Screen' has no member named 'sareaBO'
dri2.c:404: warning: implicit declaration of function 'drmBOMap'
dri2.c:404: warning: nested extern declaration of 'drmBOMap'
dri2.c:404: error: 'struct _DRI2Screen' has no member named 'sareaBO'
dri2.c:405: error: 'struct _DRI2Screen' has no member named 'sarea'
dri2.c:406: error: 'struct _DRI2Screen' has no member named 'sareaBO'
dri2.c:412: error: 'struct _DRI2Screen' has no member named 'sareaSize'
dri2.c:412: error: 'struct _DRI2Screen' has no member named 'sareaBO'
dri2.c:413: error: 'struct _DRI2Screen' has no member named 'sarea'
dri2.c:413: error: 'struct _DRI2Screen' has no member named 'sareaSize'
dri2.c:415: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:415: error: 'struct _DRI2Screen' has no member named 'sarea'
dri2.c:416: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:417: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:419: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:421: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c:421: error: 'struct _DRI2Screen' has no member named 'buffer'
dri2.c: In function 'DRI2ScreenInit':
dri2.c:435: error: 'struct _DRI2Screen' has no member named 'driverName'
dri2.c:436: error: 'struct _DRI2Screen' has no member named 'nextHandle'
dri2.c:438: error: 'struct _DRI2Screen' has no member named 'getPixmapHandle'
dri2.c:439: error: 'struct _DRI2Screen' has no member named 'beginClipNotify'
dri2.c:440: error: 'struct _DRI2Screen' has no member named 'endClipNotify'
dri2.c:442: error: 'struct _DRI2Screen' has no member named 'ClipNotify'
dri2.c:444: error: 'struct _DRI2Screen' has no member named 'HandleExposures'
make[4]: *** [libdri2_la-dri2.lo] Error 1
make[4]: Leaving directory `/GFX/build/component/Xorg/xorg/xserver/hw/xfree86/dri2'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/GFX/build/component/Xorg/xorg/xserver/hw/xfree86'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/GFX/build/component/Xorg/xorg/xserver/hw/xfree86'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/GFX/build/component/Xorg/xorg/xserver/hw'
make: *** [all-recursive] Error 1
----------------------------------------------------------------
we try to bisect and find this commit of drm (master) cause the issue:

commit f7a99407153eaba5724b6f1f2cadab62c6a50a26
Author: Eric Anholt <eric@anholt.net>
Date:   Fri Aug 8 15:55:34 2008 -0700

    Drop TTM interfaces from the userland library.