-std=c99 my anus

[code]$cat test.c
#include <stdlib.h>
#include <string.h>

int main(void) {
    char *foo;
    foo = strdup("bar");
    free(foo);
    return 0;
}
$gcc test.c
$gcc -std=c99 test.c
test.c: In function 'main':
test.c:6: warning: implicit declaration of function 'strdup'
test.c:6: warning: assignment makes pointer from integer without a cast[code]
What the heck is this, /prog/? Is there some shit around strdup() in c99?

At least compile it properly:

gcc -x c -std=c99 -v -Q -pipe -pass-exit-codes -pedantic -Wall -Wextra -Wfatal-errors -g3 -o test test.c