diff -ru calcurse-2.3~/configure.ac calcurse-2.3/configure.ac
--- calcurse-2.3~/configure.ac	2008-10-25 14:55:46.000000000 +0200
+++ calcurse-2.3/configure.ac	2008-10-25 14:55:57.000000000 +0200
@@ -56,7 +56,7 @@
 #-------------------------------------------------------------------------------
 #                                                            Compilation options
 #-------------------------------------------------------------------------------
-CFLAGS="-O2 -Wall -g"
+CFLAGS += "-Wall -g"
 #-------------------------------------------------------------------------------
 #                                                               Create Makefiles
 #-------------------------------------------------------------------------------