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$ ldd aaa
        linux-vdso.so.1 (0x00007ffd0e4c6000)
        libperl.so.5.30 => /lib64/libperl.so.5.30 (0x00007fe9264b5000)
...
        libc.so.6 => /lib64/libc.so.6 (0x00007fe9262c3000)
        libm.so.6 => /lib64/libm.so.6 (0x00007fe92617d000)
        libcrypt.so.2 => /lib64/libcrypt.so.2 (0x00007fe926142000)

in function `xs_init':
/home/jv/tmp/aaa.c:28: undefined reference to `PL_thr_key'
/bin/ld: /home/jv/tmp/aaa.c:28: undefined reference to `pthread_getspe
+cific'
/bin/ld: /home/jv/tmp/aaa.c:28: undefined reference to `Perl_newXS'

CV* Perl_newXS(pTHX_ const char *name, XSUBADDR_t subaddr, const char 
+*filename) {
  CV* (*imp)(tTHX, const char*, XSUBADDR_t, const char*);
  imp = (CV* (*)(tTHX, const char*, XSUBADDR_t, const char*)) dlsym( h
+andle, "Perl_newXS" );
  return (*imp)(my_perl, name, subaddr, filename);
}

#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
...

  return result;
}

aaa -MFcntl=:flock -E "say 1+LOCK_NB"
Undefined subroutine &Fcntl::LOCK_NB called at -e line 1.