So, how can I do next?

As the compiler obviously thinks the error has to do with test.h, it would seem to make sense to focus on that issue.  Could you try what Rob and I suggested above, i.e. simply try to compile test.c alone (which includes test.h) — possibly with option -E to get an idea of what code the compiler is actually trying to compile.

In reply to Re^3: How convert header file to XS by h2xs? by almut
in thread How convert header file to XS by h2xs? by xiaoyafeng

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