Try 2. Build 32-bit talloc:
./configure --prefix=/opt/xorg --libdir=/opt/xorg/lib32 CC=gcc -m32 CFLAGS=-march=native -O2 -g
make
make install


Problem is that mesa calls pkg-config --libs from the Makefile and not from configure, at which time PKG_CONFIG_PATH is no longer set.

Try 3. Export PKG_CONFIG_PATH.
Now it worked.


I suggest that pkg-config --libs be run at configure time, or just build the builtin talloc if system one can't be found (or wrong bitness).

I am experiencing a similar issue with the recent git master, most likely due to the GLSL branch merge:

> mklib: Making Linux shared library:  r600_dri.so.tmp
> g++ -g -O2 -Wall -Wmissing-prototypes -std=c99 -ffast-math -fvisibility=hidden -fno-strict-aliasing -m32  -fPIC -m32 -DUSE_X86_ASM -DUSE_MMX_ASM -DUSE_3DNOW_ASM -DUSE_SSE_ASM -D_GNU_SOURCE -DPTHREADS -DHAVE_POSIX_MEMALIGN -DGLX_USE_TLS -DPTHREADS -DUSE_EXTERNAL_DXTN_LIB=1 -DIN_DRI_DRIVER -DGLX_DIRECT_RENDERING -DGLX_INDIRECT_RENDERING -DHAVE_ALIAS -DHAVE_XCB_DRI2 -DHAVE_LIBUDEV -DHAVE_XEXTPROTO_71 -DHAVE_LIBDRM_RADEON=1 -I/usr/include/libdrm   -DFEATURE_GL=1 -o r600_dri.so.test ../../../../../src/mesa/drivers/dri/common/dri_test.o r600_dri.so.tmp   -ldrm   -lexpat -lm -lpthread -ldl -ldrm_radeon -ldrm  
> r600_dri.so.tmp: undefined reference to `talloc_strdup_append'
> r600_dri.so.tmp: undefined reference to `talloc_asprintf'
> r600_dri.so.tmp: undefined reference to `talloc_unlink'
> r600_dri.so.tmp: undefined reference to `talloc_strndup'
> r600_dri.so.tmp: undefined reference to `_talloc_free'
> r600_dri.so.tmp: undefined reference to `_talloc_array'
> r600_dri.so.tmp: undefined reference to `_talloc_reference_loc'
> r600_dri.so.tmp: undefined reference to `talloc_parent'
> r600_dri.so.tmp: undefined reference to `talloc_init'
> r600_dri.so.tmp: undefined reference to `talloc_strdup'
> r600_dri.so.tmp: undefined reference to `_talloc_zero'
> r600_dri.so.tmp: undefined reference to `_talloc_steal_loc'
> r600_dri.so.tmp: undefined reference to `_talloc_zero_array'
> r600_dri.so.tmp: undefined reference to `talloc_asprintf_append'
> r600_dri.so.tmp: undefined reference to `talloc_vasprintf_append'
> r600_dri.so.tmp: undefined reference to `talloc_named_const'
> r600_dri.so.tmp: undefined reference to `talloc_strndup_append'
> r600_dri.so.tmp: undefined reference to `_talloc_set_destructor'
> collect2: ld returned 1 exit status

My configure flags include --enable-32-bit and --disable-64-bit.

Thanks for tracking down the issue.  Hopefully this fixes it:

commit 639cdd3782c40c422c33c907949376c735d9340c
Author: Eric Anholt <eric@anholt.net>
Date:   Sun Aug 22 17:34:18 2010 -0700

    mesa: AC_SUBST the talloc libs/cflags so the ./configure results are saved.
    
    I had used pkg-config from the Makefile because I didn't want to screw
    around with the non-autoconf build, but that doesn't work because the
    PKG_CONFIG_PATH or TALLOC_LIBS/TALLOC_CFLAGS that people set at
    configure time needs to be respected and may not be present at build
    time.
    
    Bug #29585

(In reply to comment #3)
> Thanks for tracking down the issue.  Hopefully this fixes it:

Now on a clean Git clone the build succeeds. Thus I’d confirm this as fixed.