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I have tracked down two issues. First Sun's cc compiler does
defines __386 instead of __386__. This causes problems in
ffitarget.h 

Second, Sun's cc compiler fails on the following line in ffi.h:
} ffi_closure __attribute__((aligned (8)));

This is a problem in Sun's cc compiler. It is fixed in the
Sun Studio Express August 2006 release. I don't think there
is a patch for the "official" Sun Studio 11 compiler.

With these two changes, ctypes does compile but "make test"
still fails. I am still researching the "make test" failure.
test_crypt
test_csv
test_ctypes
sh: objdump: not found
*** Signal 11 - core dumped
make: Fatal error: Command failed for target `test'
bash-3.00$