diff --git a/configure.ac b/configure.ac
index f6df57a57d684b59264cc6638ec890fe0e703c90..feb6b7b47e5c8202880f1f0c652333c3bb5372ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ(2.52)
-AC_INIT([albert], [1.2-pre1], [dani@mathematik.uni-freiburg.de])
+AC_INIT([albert], [1.2-pre2], [dani@mathematik.uni-freiburg.de])
 
 AC_CONFIG_SRCDIR([ALBERT/src/Common/albert.h])
 AM_MAINTAINER_MODE
@@ -64,7 +64,7 @@ AC_PREFIX_DEFAULT([`pwd`])
 AC_CHECK_LIB([m],[main],,
              [AC_MSG_ERROR([no math library, exiting...!])] )
 
-AC_CHECK_FUNCS([alarm pow sqrt strdup strchr strstr],,
+AC_CHECK_FUNCS([alarm pow sqrt strdup strchr strstr unsetenv],,
 	       [AC_MSG_ERROR([Sorry, these are needed..])])
 
 AC_FUNC_MALLOC