There may also be a workaround using the C preprocessor. For example, GCC’s cpp has an option -dD which outputs the result of preprocessing (including all nested #include’d headers), but retains the #define directives for all non-predefined macros. See http://gcc.gnu.org/onlinedocs/gcc-3.2/cpp/Invocation.html#Invocation.

So, if h2ph doesn’t work out, this approach may be worth investigating.

HTH,