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#include <EXTERN.h>               /* from the Perl distribution     */
#include <perl.h>                 /* from the Perl distribution     */
...
 *         perl_env_end();
 *    }
 */

includes:  path to   perl.h 

...

    LOADLIBES=-L/usr/lib/perl5/5.8.8/i686-linux-thread-multi-ld/CORE
    STD_LIBS= -lperl

    LOADLIBES=-L/project/c_to_perl/lib/    This is where libperlenv.a 
+resides
    
    LDLIBS= -lperlenv `perl -MExtUtils::Embed -e ccopts -e ldopts`

use MySpecialLib::IO;    # Our IO library that reads/writes encrypted 
+data to the filesystem

...

        return $out_buffer;
}