[wmx] cant make wmx-5

I would like to run wmx-5 on my newly set-up Red Hat 5.2 Linux machine.
Is this possible? (The README said "Unix" and I assumed "almost Linux")
I have been able to set up my X server and run fvwm so far.
How can I tell if my "X server and libraries are R4 or newer and support the
SHape extension?" I just read the README distributed with the "wmx-5" release
and am trying to install it, but have run into some trouble.
I get the followind "error file" when I pipe the output of the "make" command:


makedepend -- -g -O2 -I/usr/include -I/usr/openwin/include -- *.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Border.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Buttons.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Channel.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Client.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Config.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Events.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Main.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Manager.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Menu.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Rotated.C
g++ -c -g -O2 -I/usr/include -I/usr/openwin/include Session.C
test -f wmx && mv -f wmx wmx.old || true
g++ -o wmx Border.o Buttons.o Channel.o Client.o Config.o Events.o Main.o Manager.o Menu.o Rotated.o Session.o -L/usr/X11/lib -lXpm -lXext -lX11 -lXmu -lSM -lICE -lm
/usr/bin/ld: cannot open -lXpm: No such file or directory
collect2: ld returned 1 exit status
make: *** [wmx] Error 1


Any help would be appreciated,
Jon Hofmann