The output comes from ExtUtils::MakeMaker. In Makefile.PL you have the line

   'LIBS'      => [$yazlibs],   # e.g., '-lm'

[download]

... which lists all the libraries that some tool wants that your XS module wants to link to. It seems that these libraries are not found (and maybe not installed) when you run Makefile.PL. The "mostly harmless" message is rarely mostly harmless as usually, required libraries are required.

I guess you can improve the compilation situation by installing the -devel packages for all the libraries listed.

In reply to Re: Warning (mostly harmless): No library found for -lxml2 by Corion
in thread Warning (mostly harmless): No library found for -lxml2 by MikeTaylor

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