commit af15c71bfbfab2e732159f06bb024aa77a489246
Author: Tobias Brunner <tobias@strongswan.org>
Date:   Mon Mar 3 17:14:26 2014 +0100

    configure: Fix autoreconf with older autotools
    
    Older autoconf versions (e.g. on CentOS 6.5) produce an empty else block
    for the removed empty argument, which the shell then trips over when
    executing ./configure.
    
    Fixes #536.

diff --git a/configure.ac b/configure.ac
index 8a925c2..ec189c9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -528,8 +528,7 @@ AC_CHECK_FUNC(
 			 AC_MSG_FAILURE([qsort_r has unknown semantics])])
 		])
 		CFLAGS="$save_CFLAGS"
-	],
-	[]
+	]
 )
 
 AC_CHECK_FUNCS(prctl mallinfo getpass closefrom getpwnam_r getgrnam_r getpwuid_r)