Index: shadow-4.5/configure.ac
===================================================================
--- shadow-4.5.orig/configure.ac
+++ shadow-4.5/configure.ac
@@ -36,7 +36,7 @@ AC_HEADER_STDC
 	utmpx.h termios.h termio.h sgtty.h sys/ioctl.h syslog.h paths.h \
 	utime.h ulimit.h sys/capability.h sys/resource.h gshadow.h lastlog.h \
 	locale.h rpc/key_prot.h netdb.h acl/libacl.h attr/libattr.h \
-	attr/error_context.h)
+	attr/error_context.h crypt.h)

 dnl shadow now uses the libc's shadow implementation
 AC_CHECK_HEADER([shadow.h],,[AC_MSG_ERROR([You need a libc with shadow.h])])
Index: shadow-4.5/lib/defines.h
===================================================================
--- shadow-4.5.orig/lib/defines.h
+++ shadow-4.5/lib/defines.h
@@ -4,6 +4,8 @@
 #ifndef _DEFINES_H_
 #define _DEFINES_H_
 
+#include "config.h"
+
 #if HAVE_STDBOOL_H
 # include <stdbool.h>
 #else
@@ -94,6 +96,10 @@ char *strchr (), *strrchr (), *strtok ()
 # include <unistd.h>
 #endif
 
+#if HAVE_CRYPT_H
+# include <crypt.h>		/* crypt(3) may be defined in here */
+#endif
+
 #if TIME_WITH_SYS_TIME
 # include <sys/time.h>
 # include <time.h>
