From dce50cd6c9d53b18449b0aa44400c0ca03d7645b Mon Sep 17 00:00:00 2001
From: Kevin Ryde <user42@zip.com.au>
Date: Sat, 21 Feb 2004 21:17:40 +0000
Subject: [PATCH] (crypt): Test with AC_SEARCH_LIBS, for the benefit of HP-UX. 
 Define HAVE_CRYPT rather than HAVE_LIBCRYPT.  Reported by Andreas Voegele.

---
 configure.in | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/configure.in b/configure.in
index 8150bff71..799ebb0ee 100644
--- a/configure.in
+++ b/configure.in
@@ -1,7 +1,7 @@
 dnl   configuration script for Guile
 dnl   Process this file with autoconf to produce configure.
 dnl
-dnl  Copyright (C) 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
+dnl  Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004 Free Software Foundation, Inc.
 dnl
 dnl  This file is part of GUILE
 dnl
@@ -270,7 +270,23 @@ AC_CHECK_FUNCS(ctermid ftime fchown getcwd geteuid gettimeofday lstat mkdir mkno
 
 AC_CHECK_HEADERS(crypt.h sys/resource.h sys/file.h)
 AC_CHECK_FUNCS(chroot flock getlogin cuserid getpriority setpriority getpass sethostname gethostname)
-AC_CHECK_LIB(crypt, crypt)
+
+# crypt() may or may not be available, for instance in some countries there
+# are restrictions on cryptography.
+#
+# crypt() might be in libc (eg. OpenBSD), or it might be in a separate
+# -lcrypt library (eg. Debian GNU/Linux).
+#
+# On HP-UX 11, crypt() is in libc and there's a dummy libcrypt.a.  We must
+# be careful to avoid -lcrypt in this case, since libtool will see there's
+# only a static libcrypt and decide to build only a static libguile.
+#
+# AC_SEARCH_LIBS lets us add -lcrypt to LIBS only if crypt() is not in the
+# libraries already in that list.
+#
+AC_SEARCH_LIBS(crypt, crypt,
+  [AC_DEFINE(HAVE_CRYPT,1,
+             [Define to 1 if you have the `crypt' function.])])
 
 ### Some systems don't declare some functions.  On such systems, we
 ### need to at least provide our own K&R-style declarations.