Martin Buchholz <martin(a)xemacs.org&gt; writes: I can think of four things. 1. Link an executable with -lXaw. Then call ldd on it to see where it is getting Xaw.so from. -L this directory. 2. Find some Athena 3D/normal Athena incompatibility test that works at run tune. Compile a small program with this test and link it with -lXaw. Observe. 3. Try finding Xaw3D in configure. If found "ln -s .../libXaw3D.so ./libXaw.so"[1]. Compile a program that uses a function specific to Xaw3D. Link it with -LXaw. Remove the symbolic link. Run the program. If it succeeds then the runtime libXaw.so is Xaw3d. 4. Default to --with-athena=3d if it is found, if somebody selects --with-athena=plain rant about making sure libXaw.so.X is plain Xaw. Jan