libXpm not found?

[Matthew Formica <mformica@mac.com>]

Hey,

I'm using WindowMaker and trying to build libdockapp on my Quadra 610 with
potato, and the ./configure file is failing in its check for
XpmCreatePixmapFromData, claiming that libXpm was not found.  However,
libXpm.so.4 (pointing to libXpm.so.4.11) is in /usr/X11R6/lib, and
/etc/ld.so.conf contains /usr/X11R6/lib, so I don't see how it's not finding
it.  Anyone else run into this problem, or have any ideas for how to fix my
setup so that the configure will work?

Matthew Formica