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It's not an OS bug, it seems certain to be a build system
bug in Python, 
please read on.

I did some more digging, and it appears that I can avoid
this problem by removing the "--without-gcc" flag to
configure.  This flag is somehow interfering with the build
process.  If I remove that flag and instead do the build
like this, I get much farther:
setenv CC "cc -xc99=%none -xarch=native64"
./configure
From there, I run make and the build proceeds much much
farther successfully linking the python interpreter itself,
but ultimately fails just past that when using the
interpreter to do the rest:

ranlib libpython2.4.a
cc -xc99=%none -xarch=native64   -o python \
                Modules/python.o \
                libpython2.4.a -lresolv -lsocket -lnsl -lrt
-ldl   -lm  
case $MAKEFLAGS in \
*-s*)  CC='cc -xc99=%none -xarch=native64' LDSHARED='cc
-xc99=%none -xarch=native64 -G' OPT='-DNDEBUG -O' ./python
-E ./setup.py -q build;; \
*)  CC='cc -xc99=%none -xarch=native64' LDSHARED='cc
-xc99=%none -xarch=native64 -G' OPT='-DNDEBUG -O' ./python
-E ./setup.py build;; \
esac
running build
running build_ext
db.h: found (4, 2) in /usr/local/include
db lib: using (4, 2) db-4.2
INFO: Can't locate Tcl/Tk libs and/or headers
building 'struct' extension
creating build
creating build/temp.solaris-2.10-sun4u-2.4
Traceback (most recent call last):
  File "./setup.py", line 1184, in ?
    main()
  File "./setup.py", line 1178, in main
    scripts = ['Tools/scripts/pydoc', 'Tools/scripts/idle',
  File "/tmp/Python-2.4.2c1/Lib/distutils/core.py", line
149, in setup
    dist.run_commands()
  File "/tmp/Python-2.4.2c1/Lib/distutils/dist.py", line
946, in run_commands
    self.run_command(cmd)
  File "/tmp/Python-2.4.2c1/Lib/distutils/dist.py", line
966, in run_command
    cmd_obj.run()
  File "/tmp/Python-2.4.2c1/Lib/distutils/command/build.py",
line 112, in run
    self.run_command(cmd_name)
  File "/tmp/Python-2.4.2c1/Lib/distutils/cmd.py", line 333,
in run_command
    self.distribution.run_command(command)
  File "/tmp/Python-2.4.2c1/Lib/distutils/dist.py", line
966, in run_command
    cmd_obj.run()
  File
"/tmp/Python-2.4.2c1/Lib/distutils/command/build_ext.py",
line 279, in run
    self.build_extensions()
  File "./setup.py", line 178, in build_extensions
    build_ext.build_extensions(self)
  File
"/tmp/Python-2.4.2c1/Lib/distutils/command/build_ext.py",
line 405, in build_extensions
    self.build_extension(ext)
  File "./setup.py", line 183, in build_extension
    build_ext.build_extension(self, ext)
  File
"/tmp/Python-2.4.2c1/Lib/distutils/command/build_ext.py",
line 470, in build_extension
    depends=ext.depends)
  File "/tmp/Python-2.4.2c1/Lib/distutils/ccompiler.py",
line 699, in compile
    self._compile(obj, src, ext, cc_args, extra_postargs,
pp_opts)
  File "/tmp/Python-2.4.2c1/Lib/distutils/unixccompiler.py",
line 112, in _compile
    self.spawn(self.compiler_so + cc_args + [src, '-o', obj] +
  File "/tmp/Python-2.4.2c1/Lib/distutils/ccompiler.py",
line 1040, in spawn
    spawn (cmd, dry_run=self.dry_run)
  File "/tmp/Python-2.4.2c1/Lib/distutils/spawn.py", line
37, in spawn
    _spawn_posix(cmd, search_path, dry_run=dry_run)
  File "/tmp/Python-2.4.2c1/Lib/distutils/spawn.py", line
122, in _spawn_posix
    log.info(string.join(cmd, ' '))
  File "/tmp/Python-2.4.2c1/Lib/distutils/log.py", line 33,
in info
    self._log(INFO, msg, args)
  File "/tmp/Python-2.4.2c1/Lib/distutils/log.py", line 23,
in _log
    print msg % args
TypeError: not enough arguments for format string
*** Error code 1