--- configure.in	2007-05-18 04:08:26.000000000 -0400
+++ configure.in.new	2008-02-27 14:42:21.000000000 -0500
@@ -91,13 +91,6 @@
 
 AC_LANG([C++])
 
-AC_PATH_CLN(1.1.0, [
-     	LIBS="$LIBS $CLN_LIBS"
-     	CPPFLAGS="$CPPFLAGS $CLN_CPPFLAGS"
-  	AC_DEFINE(HAVE_LIBCLN,1,[If CLN can be used])
-], AC_MSG_ERROR([No suitable installed version of CLN could be found.]))
-
-
 PKG_CHECK_MODULES(GLIB, [
 	glib-2.0
 	libxml-2.0 >= 2.3.8
@@ -105,6 +98,21 @@
 AC_SUBST(GLIB_CFLAGS)
 AC_SUBST(GLIB_LIBS)
 
+PKG_CHECK_MODULES(CLN, [ cln >= 1.2 ],
+                  [have_recent_cln=yes], [have_recent_cln=no])
+AC_SUBST(CLN_CPPFLAGS)
+AC_SUBST(CLN_LIBS)
+
+if test "$have_recent_cln" = "yes" ; then
+   AC_DEFINE(HAVE_LIBCLN12, 1, [Define if CLN can be used])
+else
+   AC_PATH_CLN(1.1.0, [
+  	AC_DEFINE(HAVE_LIBCLN11,1,[If CLN can be used])
+   ], AC_MSG_ERROR([No suitable installed version of CLN could be found.]))
+fi
+LIBS="$LIBS $CLN_LIBS"
+CPPFLAGS="$CPPFLAGS $CLN_CPPFLAGS"
+
 dnl  --------------------------------
 dnl | check for readline            |-----------------------------------------
 dnl  --------------------------------
--- libqalculate/Number.cc	2007-05-18 04:03:22.000000000 -0400
+++ libqalculate/Number.cc.new	2008-02-27 14:56:11.000000000 -0500
@@ -9,6 +9,8 @@
     (at your option) any later version.
 */
 
+#include "config.h"
+
 #include "support.h"
 
 #include "Number.h"
@@ -28,6 +30,7 @@
 
 using namespace cln;
 
+#ifdef HAVE_LIBCLN11
 void cln::cl_abort() {
 	CALCULATOR->error(true, "CLN Error: see terminal output (probably too large or small floating point number)", NULL);
 	if(CALCULATOR->busy()) {
@@ -36,6 +39,7 @@
 		exit(0);
 	}
 }
+#endif
 
 string printCL_I(cl_I integ, int base = 10, bool display_sign = true, BaseDisplay base_display = BASE_DISPLAY_NORMAL, bool lower_case = false) {
 	if(base == BASE_ROMAN_NUMERALS) {