diff -Nupr grass-6.3.0/imagery/i.atcorr/Output.h~ grass-6.3.0/imagery/i.atcorr/Output.h
--- grass-6.3.0/imagery/i.atcorr/Output.h~  2009-04-29 20:49:42.000000000 +0000
+++ grass-6.3.0/imagery/i.atcorr/Output.h   2009-04-29 20:49:50.000000000 +0000
@@ -1,6 +1,7 @@
 #ifndef MY_OUTPUT_H
 #define MY_OUTPUT_H
 
+#include <cstdio>
 #include <iostream>
 #include <sstream>
 #include <string>