One more thing, as I tried to rebuild whole python I've encountered on following problem:

building '_multiprocessing' extension
gcc -fPIC -fno-strict-aliasing -g -O2 -DNDEBUG -DHAVE_SEM_OPEN=1 -DHAVE_FD_TRANSFER=1 -DHAVE_SEM_TIMEDWAIT=0 -IModules/_multiprocessing -I. -IInclude -I./Include -I/usr/local/include -I/home/malyska/bld/python_sol10/Python-2.7.1/Include -I/home/malyska/bld/python_sol10/Python-2.7.1 -c /home/malyska/bld/python_sol10/Python-2.7.1/Modules/_multiprocessing/multiprocessing.c -o build/temp.solaris-2.9-sun4u-2.7/home/malyska/bld/python_sol10/Python-2.7.1/Modules/_multiprocessing/multiprocessing.o
gcc -fPIC -fno-strict-aliasing -g -O2 -DNDEBUG -DHAVE_SEM_OPEN=1 -DHAVE_FD_TRANSFER=1 -DHAVE_SEM_TIMEDWAIT=0 -IModules/_multiprocessing -I. -IInclude -I./Include -I/usr/local/include -I/home/malyska/bld/python_sol10/Python-2.7.1/Include -I/home/malyska/bld/python_sol10/Python-2.7.1 -c /home/malyska/bld/python_sol10/Python-2.7.1/Modules/_multiprocessing/socket_connection.c -o build/temp.solaris-2.9-sun4u-2.7/home/malyska/bld/python_sol10/Python-2.7.1/Modules/_multiprocessing/socket_connection.o
gcc -fPIC -fno-strict-aliasing -g -O2 -DNDEBUG -DHAVE_SEM_OPEN=1 -DHAVE_FD_TRANSFER=1 -DHAVE_SEM_TIMEDWAIT=0 -IModules/_multiprocessing -I. -IInclude -I./Include -I/usr/local/include -I/home/malyska/bld/python_sol10/Python-2.7.1/Include -I/home/malyska/bld/python_sol10/Python-2.7.1 -c /home/malyska/bld/python_sol10/Python-2.7.1/Modules/_multiprocessing/semaphore.c -o build/temp.solaris-2.9-sun4u-2.7/home/malyska/bld/python_sol10/Python-2.7.1/Modules/_multiprocessing/semaphore.o
gcc -shared build/temp.solaris-2.9-sun4u-2.7/home/malyska/bld/python_sol10/Python-2.7.1/Modules/_multiprocessing/multiprocessing.o build/temp.solaris-2.9-sun4u-2.7/home/malyska/bld/python_sol10/Python-2.7.1/Modules/_multiprocessing/socket_connection.o build/temp.solaris-2.9-sun4u-2.7/home/malyska/bld/python_sol10/Python-2.7.1/Modules/_multiprocessing/semaphore.o -L/home/malyska/bld/python_sol10/install/lib -L/usr/local/lib -o build/lib.solaris-2.9-sun4u-2.7/_multiprocessing.so
*** WARNING: renaming "_multiprocessing" since importing it failed: ld.so.1: python: fatal: relocation error: file build/lib.solaris-2.9-sun4u-2.7/_multiprocessing.so: symbol sem_timedwait: referenced symbol not found

so I had to commented out HAVE_SEM_TIMEDWAIT from setup.py, see:
             elif platform.startswith('sunos5'):
                  macros = dict(
                      HAVE_SEM_OPEN=1,
                      HAVE_FD_TRANSFER=1
                      )
                      #HAVE_SEM_TIMEDWAIT=0,
                  libraries = ['rt']
thanks