Andy Piper <andy(a)xemacs.org&gt; writes: No, this is the case that breaks. I am not exactly sure what you mean here. This works. The problem is that xlwgauge.c (and others) use c) in this case. Yes. Breaks Note that people who have overwritten the headers typically also have overwritten lixXaw.so. We are trying to never get into c). We want d) Note that e) is what people used to do, but modern installations all use d). we need to do something like this Check for libXaw3d.so If found FOUND_XAW3D = yes LIBXAW3D = libXaw3d.so else FOUND_XAW3D = no Check for libXaw.so If found Check for existance of threeDClassRec if found # Xaw.so is actually Xaw3D FOUND_XAW3D = yes FOUND_XAW = no if not set LIBXAW3D = libXaw3d.so else FOUND_XAW = yes LIBXAWNORMAL = libXaw.so Check for ThreeD_P in Xaw3D/<something>.h if found if FOUND_XAW3D == yes HAVE_XAW3D = yes INCLXAW3D = Xaw3D else check in X11/Xaw/<something.h> if found if FOUND_XAW3D == yes HAVE_XAW3D = yes INCLXAW3D = X11/Xaw else #error else HAVE_XAW3D = no HAVE_XAW = yes INCLXAWBORMAL = X11/Xaw/ ....process user options if HAVE_XAW3D = yes INCLXAW = INCLXAW3D LIBXAW = LIMLXAW3D else if HAVE_XAW = yes INCLXAW = INCLXAWNORMAL LIBXAW = LIMLXAWNORMAL and then make sure we include from INCLXAW and link with LIBXAW Jan