missing library?

[Mike Morasky <mikem@xxxxxxxxxxxx>]

I've finally managed to compile oiv on a ppc linux system and it works great
but I am failing at some of the "apps" due to the following errors:

usr/bin/g++         -I/usr/X11R6/include -I.
-I../../../lib/database/include -I../../../lib/interaction/include
-I../../../lib/nodekits/include -I../../../libSoXt/include -fPIC
-O -DNDEBUG   -c ivinfo.c++
/usr/bin/g++    -L/usr/X11R6/lib -L//usr/lib  ivinfo.o
-lInventor  -o ivinfo
/usr/bin/../lib/libGL.so.1: undefined reference to `XShmDetach'
/usr/bin/../lib/libGL.so.1: undefined reference to `XShmCreateImage'
/usr/bin/../lib/libGL.so.1: undefined reference to `XShmPutImage'
/usr/bin/../lib/libGL.so.1: undefined reference to `XShmAttach'
/usr/bin/../lib/libGL.so.1: undefined reference to `XShmQueryVersion'
collect2: ld returned 1 exit status

I've traced these calls to XShm.h but am unsure which library they should be
loaded from and why they aren't being resolved.

Can anyone point me in the right direction?

thanks
mike