Hello samtregar. Your suggestion was a step in the right way. But there was also a few lines lacking for the perl-allocation. Now, I can represent a working C code.

#include <stdio.h>
#include <stdlib.h>
#include <EXTERN.h>
#include <perl.h>

static PerlInterpreter *my_perl;

int main(void) {
  char *var;
  char *embedding[] = {"", "-e", "0"};

  my_perl = perl_alloc();
  perl_construct(my_perl);
  perl_parse(my_perl, NULL, 3, embedding, NULL);
  perl_run(my_perl);

  eval_pv("use MyConfig", TRUE);
  var = SvPV_nolen(get_sv("MyConfig::var", TRUE));

  printf(">%s<\n", var);

  return(EXIT_SUCCESS);
}
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