Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -1,11 +1,12 @@
 AC_INIT(pwgen.c)
 AC_PREREQ(2.50)
+AC_CONFIG_HEADERS(config.h)
 AC_PROG_CC
 AC_PROG_INSTALL
 AC_PATH_PROG(MV, mv, mv)
 AC_PATH_PROG(RM, rm, rm)
 AC_PATH_PROG(SED, sed, sed)
 AC_PATH_PROG(PERL, perl, perl)
-AC_CHECK_FUNCS(getopt_long)
+AC_CHECK_FUNCS(arc4random arc4random_uniform getopt_long pledge)
 AC_CHECK_HEADERS(getopt.h)
 AC_OUTPUT(Makefile)