From 201640b4b9b7ea1f6b171cb43ed033e315fcbbc1 Mon Sep 17 00:00:00 2001
From: Seungha Son <seungha.son@samsung.com>
Date: Tue, 23 Nov 2021 15:07:51 +0900
Subject: [PATCH] Fix build when crypt() is not part of crypt_libs

 * configure.ac: Don't set empty -l option in crypt check

 upstream :
  https://github.com/linux-pam/linux-pam/commit/01e0038fa55581c4afc9d63b6180d2ea77ba2940

Change-Id: Ibcab19d61f8f3c074b48e696b17b5a7ebf233b91
Signed-off-by: Seungha Son <seungha.son@samsung.com>
(cherry picked from commit 5b0f078ec372f810b832d0f261c68826fb97d4f9)
---
 configure.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.in b/configure.in
index ae762a2..385f065 100644
--- a/configure.in
+++ b/configure.in
@@ -400,7 +400,7 @@ AS_IF([test "x$ac_cv_header_xcrypt_h" = "xyes"],
   [crypt_libs="crypt"])
 
 BACKUP_LIBS=$LIBS
-AC_SEARCH_LIBS([crypt],[$crypt_libs], LIBCRYPT="-l$ac_lib", LIBCRYPT="")
+AC_SEARCH_LIBS([crypt],[$crypt_libs], LIBCRYPT="${ac_lib:+-l$ac_lib}", LIBCRYPT="")
 AC_CHECK_FUNCS(crypt_r crypt_gensalt_r)
 LIBS=$BACKUP_LIBS
 AC_SUBST(LIBCRYPT)
-- 
2.7.4