cmake with xlc / xlc_r (Visual Age 7.0)

$ cmake src
-- The C compiler identification is unknown
-- The CXX compiler identification is unknown
-- Check for working C compiler: /usr/bin/xlc_r
-- Check for working C compiler: /usr/bin/xlc_r -- broken
CMake Error at /home/amukher1/opt/cmake/aix52/share/cmake-2.8/Modules/CMakeTestCCompiler.cmake:52
(MESSAGE):
  The C compiler "/usr/bin/xlc_r" is not able to compile a simple test
  program.

  It fails with the following output:

   Change Dir: /home/amukher1/buildarea/vcs_bzs/cmake/AIX/5.2/powerpc/32/CMakeFiles/CMakeTmp

  Run Build Command:/usr/bin/gmake "cmTryCompileExec3576455604/fast"

  /usr/bin/gmake -f CMakeFiles/cmTryCompileExec3576455604.dir/build.make
  CMakeFiles/cmTryCompileExec3576455604.dir/build

  gmake[1]: Entering directory
  `/home/amukher1/buildarea/vcs_bzs/cmake/AIX/5.2/powerpc/32/CMakeFiles/CMakeTmp'


  /home/amukher1/opt/cmake/aix52/bin/cmake -E cmake_progress_report
  /home/amukher1/buildarea/vcs_bzs/cmake/AIX/5.2/powerpc/32/CMakeFiles/CMakeTmp/CMakeFiles
  1

  Building C object
  CMakeFiles/cmTryCompileExec3576455604.dir/testCCompiler.c.o

  /usr/bin/xlc_r -o
  CMakeFiles/cmTryCompileExec3576455604.dir/testCCompiler.c.o -c
  /home/amukher1/buildarea/vcs_bzs/cmake/AIX/5.2/powerpc/32/CMakeFiles/CMakeTmp/testCCompiler.c


  Linking C executable cmTryCompileExec3576455604

  /home/amukher1/opt/cmake/aix52/bin/cmake -E cmake_link_script
  CMakeFiles/cmTryCompileExec3576455604.dir/link.txt --verbose=1

  /usr/bin/xlc_r CMakeFiles/cmTryCompileExec3576455604.dir/testCCompiler.c.o
  -o cmTryCompileExec3576455604 /usr/lib /lib

  ld: 0711-168 SEVERE ERROR: Input file: /usr/lib

        Input files must be regular files.

  gmake[1]: *** [cmTryCompileExec3576455604] Error 12

  gmake[1]: Leaving directory
  `/home/amukher1/buildarea/vcs_bzs/cmake/AIX/5.2/powerpc/32/CMakeFiles/CMakeTmp'

  gmake: *** [cmTryCompileExec3576455604/fast] Error 2


  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:3 (project)


-- Configuring incomplete, errors occurred!