diff -ur old/makefile new/makefile
--- old/makefile	2004-07-28 12:39:17.000000000 +0200
+++ new/makefile	2006-03-16 13:22:46.000000000 +0100
@@ -59,4 +59,4 @@
 	make
 
 clean:
-	-rm *.o *% $(EJECUTABLE) h1.pov h1.png
+	-rm -f *.o *% $(EJECUTABLE) h1.pov h1.png
diff -ur old/POVRayFileWriter.C new/POVRayFileWriter.C
--- old/POVRayFileWriter.C	2004-08-05 12:57:57.000000000 +0200
+++ new/POVRayFileWriter.C	2006-03-16 13:21:12.000000000 +0100
@@ -21,6 +21,7 @@
 
 #include "POVRayFileWriter.H"
 #include <fstream>
+#include <cmath>
 
 namespace H3DC
 {