How do I embed perl script in gwan c script?

Question

Below is my c script. I don't know why EXTERN.h and perl.h is not found so I'm doing the user defined linking below. If can solve this, please help too.

I'm trying to embed perl script in C. The file is hell.c, shorten from the hello.c file

Would love to run embedded perl script from c.

Error as below when trying to run gwan:

In file included from /usr/lib/perl/5.10.1/CORE/perl.h:2424:0,
                 from /home/qryos/Downloads/gwan_linux64-bit/0.0.0.0_8080/#0.0.0.0/csp/hell.c:9:
/usr/lib/perl/5.10.1/CORE/handy.h:108:0: warning: "bool" redefined
/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.5.2/include/stdbool.h:33:0: note: this is the location of the previous definition
In file included from /usr/lib/perl/5.10.1/CORE/perl.h:3427:0,
                 from /csp/hell.c:9:
/usr/lib/perl/5.10.1/CORE/utf8.h:46:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'unsigned'
In file included from /csp/hell.c:9:0:
/usr/lib/perl/5.10.1/CORE/perl.h:4205:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'char'
/usr/lib/perl/5.10.1/CORE/perl.h:4207:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'char'

Actual Script

// ============================================================================
// C servlet sample for the G-WAN Web Application Server (http://trustleap.ch/)
// ----------------------------------------------------------------------------
// hello.c: just used with ab (ApacheBench) to benchmark a minimalist servlet
// ============================================================================
#include "gwan.h" // G-WAN exported functions
//#include <EXTERN.h>
//#include <perl.h>
#include "/usr/lib/perl/5.10.1/CORE/perl.h"
#include "/usr/lib/perl/5.10.1/CORE/EXTERN.h"

    static PerlInterpreter *my_perl;

/*
    int main(int argc, char **argv, char **env)
    {
        char *args[] = { NULL };
        PERL_SYS_INIT3(&argc,&argv,&env);
        my_perl = perl_alloc();
        perl_construct(my_perl);
        perl_parse(my_perl, NULL, argc, argv, NULL);
        PL_exit_flags |= PERL_EXIT_DESTRUCT_END;
        call_argv("showtime", G_DISCARD | G_NOARGS, args);
        perl_destruct(my_perl);
        perl_free(my_perl);
        PERL_SYS_TERM();
    }
*/

int main(int argc, char *argv[], char *env[])
{
   static char msg[] = "Hello, ANSI C!";
   xbuf_ncat(get_reply(argv), msg, sizeof(msg) - 1);

/*
        //PERL_SYS_INIT3(&argc,&argv,&env);
        my_perl = perl_alloc();
        perl_construct(my_perl);
        perl_parse(my_perl, NULL, argc, argv, NULL);
        PL_exit_flags |= PERL_EXIT_DESTRUCT_END;
//        call_argv("showtime", G_DISCARD | G_NOARGS, args);
        perl_destruct(my_perl);
        perl_free(my_perl);
        PERL_SYS_TERM();
*/

   return 200; // return an HTTP code (200:'OK')
}

UPDATE, Gil suggestion

I've put in this

#pragma include "/usr/lib/perl/5.10.1/CORE/"
#include <EXTERN.h>
#include <perl.h>

Error below:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Error: hell.c
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/perl/5.10.1/CORE/perl.h:2424:0,
                 from /home/example/Downloads/gwan/0.0.0.0_8080/#0.0.0.0/csp/hell.c:9:
/usr/lib/perl/5.10.1/CORE/handy.h:108:0: warning: "bool" redefined
/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.5.2/include/stdbool.h:33:0: note: this is the location of the previous definition
In file included from /usr/lib/perl/5.10.1/CORE/perl.h:4829:0,
                 from /csp/hell.c:9:
/usr/lib/perl/5.10.1/CORE/proto.h:690:47: error: expected declaration specifiers or '...' before 'off64_t'
/usr/lib/perl/5.10.1/CORE/proto.h:697:21: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Perl_do_sysseek'
/usr/lib/perl/5.10.1/CORE/proto.h:702:21: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Perl_do_tell'
/usr/lib/perl/5.10.1/CORE/proto.h:6019:21: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Perl_PerlIO_tell'
/usr/lib/perl/5.10.1/CORE/proto.h:6020:53: error: expected declaration specifiers or '...' before 'off64_t'
/csp/hell.c:29:5: error: conflicting types for 'main'
/home/example/Downloads/gwan/include/gwan.h:36:13: note: previous declaration of 'main' was here

Answer 1

You have compilation errors in the Perl C headers. You should start with this.

It looks like the main issue is missing definitions, look for Perl directory tree dependencies and add any missing directory with the G-WAN #pragma include directive:

#pragma include "/usr/lib/perl/5.10.1/"

THEN, you will be able to use #include <perl.h>.

Keep in mind that G-WAN won't compile a program that fails to compile with GCC. So your first step is probably to make your Perl script embedding work as a stand-alone program... and then try to integrate it with G-WAN.