--- Makefile.in.orig	1997-06-04 18:09:59.000000000 +0200
+++ Makefile.in	2008-04-22 17:31:33.000000000 +0200
@@ -59,14 +59,12 @@
 # Tiny bundled executable uses shared versions of tcl/tk libraries
  TINY_BLIBS = $(LIBS)
 
-       OPTF = -O
-
-   CXXFLAGS = $(OPTF)
     CXXINCS = -I. -I$(srcdir) -I$(srcdir)/calendar \
               -I$(srcdir)/types -I$(srcdir)/time \
-              $(X_CFLAGS) -I@TCL_INCDIR@ -I@TK_INCDIR@
+	      -I$(prefix)/include \
+              $(X_CFLAGS) -I@TCL_INCDIR@ -I@TK_INCDIR@ \
 
-     CFLAGS = $(OPTF) -I. -I$(srcdir) $(X_CFLAGS)
+     CFLAGS += -I. -I$(srcdir) $(X_CFLAGS)
 
 OBJS = cal_tcl.o dateeditor.o dispatch.o ical.o ical_tcl.o \
        item_tcl.o object.o time_tcl.o @LIBOBJS@