tecra8100:/usr/src/Mesa # make linux-dri-x86
(cd configs && rm -f current && ln -s linux-dri-x86 current)
make default
make[1]: Entering directory `/usr/src/Mesa'
make[2]: Entering directory `/usr/src/Mesa/src'
Making sources for linux-dri-x86
make[3]: Entering directory `/usr/src/Mesa/src/glx/x11'
gcc -c -I. -I../../../include -I../../../include/GL/internal -I../../../src/mesa/main -I../../../src/mesa/glapi -I../../../src/mesa/drivers/dri/common `pkg-config --cflags libdrm` -I/usr/X11R6/include -Wall -Wmissing-prototypes -std=c99 -ffast-math -O -g  -m32 -D_POSIX_SOURCE -D_POSIX_C_SOURCE=199309L -D_SVID_SOURCE -D_BSD_SOURCE -D_GNU_SOURCE -DPTHREADS -DUSE_EXTERNAL_DXTN_LIB=1 -DIN_DRI_DRIVER -DGLX_DIRECT_RENDERING -DHAVE_ALIAS -DUSE_X86_ASM -DUSE_MMX_ASM -DUSE_3DNOW_ASM -DUSE_SSE_ASM -DXF86VIDMODE -D_REENTRANT -UIN_DRI_DRIVER -DDEFAULT_DRIVER_DIR=\"/usr/X11R6/lib/modules/dri\" glcontextmodes.c -o glcontextmodes.o
glcontextmodes.c:45:20: error: X11/X.h: No such file or directory
In file included from glcontextmodes.c:46:
../../../include/GL/glx.h:38:22: error: X11/Xlib.h: No such file or directory
../../../include/GL/glx.h:39:23: error: X11/Xutil.h: No such file or directory