cat of perlportable.c
-----
#include <EXTERN.h>
#include <perl.h>

        /* we're going to embed two interpreters */

        #define SAY_HELLO "-e", "$string = $^X; $string =~ s/.*\///; $newstring = $^X ; $newstring =~ s/$string//; print $newstring;"
        int main(int argc, char **argv, char **env)
        {
            PerlInterpreter *one_perl;
            char *one_args[] = { "one_perl", SAY_HELLO };
            PERL_SYS_INIT3(&argc,&argv,&env);
            one_perl = perl_alloc();
            PERL_SET_CONTEXT(one_perl);
            perl_construct(one_perl);
            perl_parse(one_perl, NULL, 3, one_args, (char **)NULL);
            perl_run(one_perl);
            perl_destruct(one_perl);
            perl_free(one_perl);
            PERL_SYS_TERM();
        }
-----
perlportable.c: In function ‘main’:
perlportable.c:10:46: warning: unknown escape sequence: '\/'
             char *one_args[] = { "one_perl", SAY_HELLO };
                                              ^
executing a.out
syntax error at -e line 1, near "/;"
Execution of -e aborted due to compilation errors.