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--- camfr/primitives/section/sectiondisp.cpp~	2007-07-18 09:48:46.000000000 +0100
+++ camfr/primitives/section/sectiondisp.cpp	2008-07-02 11:18:24.000000000 +0100
@@ -20,7 +20,8 @@
 using std::cout;
 using std::cerr;
 using std::endl;
-
+#include <complex>
+using std::abs;
 #include "../../util/vectorutil.h"
 
 /////////////////////////////////////////////////////////////////////////////