[Scribus] How to include /usr/X11R6/lib64 in library search path (scribus 1.3.5svn)

[Reinhard Zwirnmann]

Hi there,

I'm trying to compile a new version of scribus 1.3.5svn. The compiler / linker 
is looking for the x11 libs in /usr/lib64 instead of /usr/X11R6/lib64, where 
they are installed (at least for both my openSUSE distros).

The german error code looks like this:
CMakeFiles/Makefile2:1747: Warnung: Die Befehle f?r das 
Ziel ?scribus/styles/CMakeFiles/scribus_styles_lib.dir/clean? werden 
?berschrieben
CMakeFiles/Makefile2:1645: Warnung: Alte Befehle f?r das 
Ziel ?scribus/styles/CMakeFiles/scribus_styles_lib.dir/clean? werden 
ignoriert
make[2]: *** Keine Regel vorhanden, um das Target ?/usr/lib64/libSM.so?,
  ben?tigt von ?scribus/scribus?, zu erstellen.  Schluss.
make[1]: *** [scribus/CMakeFiles/scribus.dir/all] Fehler 2
make: *** [all] Fehler 2

How can I tell the compiler or cmake or whatever to look in /usr/X11R6/lib64, 
too?

Thanks for an answer,
Reinhard