Could not find platform independent libraries

[pythonhelpneeded]

While building Python 2.4.3 on SCO OpenServer 5.0.5, I'm getting the
error below.  The modules mentioned seem to be available in the Lib
subdirectory.  I've tried setting PYTHONHOME to the build directory
(/tmp/Python-2.4.3), it didn't help.

Any help would be appreciated.

# make
        case $MAKEFLAGS in \
        *-s*)  CC='cc' LDSHARED='cc -Wl,-G,-Bexport' OPT='-DNDEBUG -O'
./python -E ./setup.py -q build;; \
        *)  CC='cc' LDSHARED='cc -Wl,-G,-Bexport' OPT='-DNDEBUG -O'
./python -E ./setup.py build;; \
        esac
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
'import site' failed; use -v for traceback
Traceback (most recent call last):
  File "./setup.py", line 6, in ?
    import sys, os, getopt, imp, re
ImportError: No module named os
*** Error code 1 (bu21)
UX:make: ERROR: fatal error.