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I hit the same problem. Here's what I did to get it to
compile on my redhat-9.0 system:

--- Makefile.generic 2002-07-05 07:20:58.000000000 -0700
+++ Makefile 2003-11-02 21:38:23.000000000 -0800
@@ -6,8 +6,8 @@
motif_includes = -I/usr/local/include

# X and Motif libraries and locations.
-xlib = -L/opt/X11R6/lib -lXpm -lXmu -lXp -lXext
-lXt -lX11
-motif = -L/usr/local/lib -lXm
+xlib = -L/usr/X11R6/lib -lXpm -lXmu -lXp -lXext
-lXt -lX11
+motif = -lXm
thread = -lpthread