When trying to build Python 2.6 on AIX 5.2 the following error message:

(
 The steps I have taken prior to this are:
  1. export PATH=/usr/bin/:/usr/vacpp/bin/
  2. ./configure --with-gcc=xlc_r --with-cxx=xlC_r --disable-ipv6
  3. make
)

./Modules/ld_so_aix xlc_r -bI:Modules/python.exp build/temp.aix-5.2-
2.6/home/mabr/Python-2.6/Modules/_multiprocessing/multiprocessing.o 
build/temp.aix-5.2-2.6/home/mabr/Python-
Modules/_multiprocessing/socket_connection.o build/temp.aix-5.2-
2.6/home/mabr/Python-2.6/Modules/_multiprocessing/semaphore.o -
L/usr/local/lib -o build/lib.aix-5.2-2.6/_multiprocessing.so
ld: 0711-317 ERROR: Undefined symbol: .sem_timedwait
ld: 0711-317 ERROR: Undefined symbol: .CMSG_SPACE
ld: 0711-317 ERROR: Undefined symbol: .CMSG_LEN
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more 
information.
*** WARNING: renaming "_multiprocessing" since importing it failed: No 
such file or directory
error: No such file or directory
make: The error code from the last command is 1.