problem with dri-7.4.4,2 on freebsd 8.0

[david at kiner.com]

Hello,
I try  to install xorg on freebsd 8.0.
I have an error when system try to install dri 

Here the log:
===>  Installing for xorg-7.5
===>   xorg-7.5 depends on file: /usr/local/libdata/pkgconfig/dri.pc - not
found
===>    Verifying install for /usr/local/libdata/pkgconfig/dri.pc in
/usr/ports/graphics/dri
===>  Building for dri-7.4.4,2
gmake[1]: Entering directory `/usr/ports/graphics/dri/work/Mesa-7.4.4/src'
Making sources for autoconf
gmake[2]: Entering directory
`/usr/ports/graphics/dri/work/Mesa-7.4.4/src/glx/x11'
cc -c -I. -I../../../include -I../../../include/GL/internal
-I../../../src/mesa -I../../../src/mesa/glapi -I/usr/local/in              
         clude -I/usr/local/include/drm   -I/usr/local/include  
-D_THREAD_SAFE -I/usr/local/include   -I/usr/local/include -O2 -p          
             ipe -fno-strict-aliasing -Wall -Wmissing-prototypes -std=c99
-ffast-math -fno-strict-aliasing  -fPIC  -DUSE_X86_ASM -DUSE               
        _MMX_ASM -DUSE_3DNOW_ASM -DUSE_SSE_ASM -DHAVE_POSIX_MEMALIGN
-DUSE_XCB -DPTHREADS -DUSE_EXTERNAL_DXTN_LIB=1 -DIN_DRI_DRIV               
        ER -DHAVE_ALIAS -DGLX_INDIRECT_RENDERING -DGLX_DIRECT_RENDERING
-DXF86VIDMODE -D_REENTRANT -UIN_DRI_DRIVER -DDEFAULT_DRIV                  
     ER_DIR=\"/usr/local/lib/dri\" glxext.c -o glxext.o
glxext.c:42:33: error: X11/extensions/Xext.h: No such file or directory
glxext.c:43:36: error: X11/extensions/extutil.h: No such file or directory
glxext.c:81: error: expected '=', ',', ';', 'asm' or '__attribute__'
before '*' token
glxext.c: In function '__glXCloseDisplay':
glxext.c:110: warning: implicit declaration of function
'XextRemoveDisplay'
glxext.c:110: error: '__glXExtensionInfo' undeclared (first use in this
function)
glxext.c:110: error: (Each undeclared identifier is reported only once
glxext.c:110: error: for each function it appears in.)
glxext.c: At top level:
glxext.c:116: error: expected ')' before numeric constant
glxext.c:134: error: expected ')' before '&' token
glxext.c: In function '__glXFreeDisplayPrivate':
glxext.c:187: warning: implicit declaration of function
'FreeScreenConfigs'
glxext.c: In function '__glXInitialize':
glxext.c:653: error: 'XExtDisplayInfo' undeclared (first use in this
function)
glxext.c:653: error: 'info' undeclared (first use in this function)
glxext.c:653: warning: implicit declaration of function '__glXFindDisplay'
glxext.c:677: warning: implicit declaration of function 'XextHasExtension'
glxext.c:680: warning: implicit declaration of function
'XMissingExtension'
gmake[2]: *** [glxext.o] Error 1
gmake[2]: Leaving directory
`/usr/ports/graphics/dri/work/Mesa-7.4.4/src/glx/x11'
gmake[1]: *** [subdirs] Error 1
gmake[1]: Leaving directory `/usr/ports/graphics/dri/work/Mesa-7.4.4/src'
gmake: *** [default] Error 1
*** Error code 1

Stop in /usr/ports/graphics/dri.
*** Error code 1

Stop in /usr/ports/x11/xorg.

I try to look for with google, but i didn't find any solutions.
do you have an idea?

regards,

David KINER