#ifdef R__HAVE_CONFIG
#include "RConfigure.h"
#endif 

Having this conditional caused RConfigure.h to be missing from the .d
files and hence these files would not be recompiled after re-configuring
using --prefix.


git-svn-id: http://root.cern.ch/svn/root/trunk@20411 27541ba8-7e3a-0410-8455-c3a389f83636