Add definition of free and setenv, Michael Weber <xmw@gentoo.org> Oct 18th, 2010

--- pam_fprint-0.2/src/pam_fprint.c
+++ pam_fprint-0.2/src/pam_fprint.c
@@ -22,6 +22,7 @@
 #include <sys/types.h>
 #include <pwd.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include <fprint.h>