or C blocks. For example, the XS: void foo_bar(int i); when C is invoked with C<-s foo_> will install a C function in Perl, but really call C in C. Most of the time, this is the opposite of what you want and failure modes are somewhat obscure, so please avoid this option where possible. =back =head1 ENVIRONMENT No environment variables are used. =head1 AUTHOR Originally by Larry Wall. Turned into the C module by Ken Williams. =head1 MODIFICATION HISTORY See the file F. =head1 SEE ALSO perl(1), perlxs(1), perlxstut(1), ExtUtils::ParseXS =cut