owl@azdaja:~/c/shadow# gcc -o promenipass promenipass.c -lshadow \
 -I/sources/shadow-4.0.2 -I/sources/shadow-4.0.2/lib \
 -I/sources/shadow-4.0.2/libmisc

/lib/libshadow.a(commonio.o): In function ec_lock_count':
commonio.o(.text+0x5f3): undefined reference to scd_flush_cache'
commonio.o(.text+0x5ff): undefined reference to scd_flush_cache'
collect2: ld returned 1 exit status

source
_________________________________________________________

promenipass.c

// thiese are the include lines from passwd.c
#include <config.h>
#include "prototypes.h"
#include "defines.h"
#include <sys/types.h>
#include <time.h>
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <pwd.h>
#include "pwauth.h"
#include "shadowio.h"
#include "pwio.h"
#include "getdef.h"

int main(void) {
struct spwd *sp;

if ( lckpwdf() )  {
    printf ("Shadow fajl nije zakljucan\n");
    exit(1);
}
sp = getspnam("owl");
// just for test I'm not encrypting it
sp->sp_pwdp="encpass";

spw_update(sp);

if ( ulckpwdf() )
    printf ("Now u'r in trouble\n");
return 1;
}