--- 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 +using std::abs; #include "../../util/vectorutil.h" /////////////////////////////////////////////////////////////////////////////