h2ph converts any C header files specified to the corresponding Perl
       header file format.  It is most easily run while in /usr/include:
 
               cd /usr/include; h2ph * sys/*
 
       or
 
               cd /usr/include; h2ph * sys/* arpa/* netinet/*
 
       or
 
               cd /usr/include; h2ph -r -l .
 
       The output files are placed in the hierarchy rooted at Perl's architec-
       ture dependent library directory.  You can specify a different hierar-
       chy with a -d switch.
 
       If run with no arguments, filters standard input to standard output.