Compare.cpp not compilable

[Kornel Benko]

with gcc 4.4.
...
/usr/src/lyx/lyx-devel/src/Compare.cpp: In member function ‘int 
lyx::Compare::Impl::find_middle_snake(const lyx::DocRangePair&, lyx::DocPair&)’:
/usr/src/lyx/lyx-devel/src/Compare.cpp:643: error: ‘ceil’ was not declared in 
this scope
make[2]: *** [src/CMakeFiles/lyx.dir/usr/src/lyx/lyx-devel/src/Compare.o] Error 
1
make[2]: *** Waiting for unfinished jobs....
...

        Kornel

Index: src/Compare.h
===================================================================
--- src/Compare.h	(Revision 32931)
+++ src/Compare.h	(Arbeitskopie)
@@ -17,6 +17,7 @@
 #include "support/FileName.h"
 
 #include <string>
+#include <cmath>
 
 #include <QObject>
 #include <QThread>

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