developer's libs missing?

[Seth Arnold <sarnold@willamette.edu>]

Greetings folks! [Apologies for not returning after winter break; my
senior project is taking too much of time.]

I am trying to compile plex86 on my Debian unstable system with XFree86
4.0.2-7, kernel 2.4.2 SMP (on dual celerons), glibc 2.2.2-1. I get an
error message saying it cannot find libX11 [1].

I asked on the plex86 list if I was missing an obvious library since I
thought I had all the right packages installed. I think the xlibs-dev
package is missing some required header files: specifically, libX11.h.
$ dpkg -L xlibs-dev  | grep -i libx11
/usr/X11R6/lib/libX11.a
/usr/X11R6/lib/libX11.so

Shouldn't there be some header files included with this package? If I
missed a package, could someone swing the clue-bat this direction and
help me out? Thanks. :)

[1]:
$ make
make -C user   CC="gcc" CFLAGS="-g -O2 -Wall -Wstrict-prototypes"
LDFLAGS=""
make[1]: Entering directory `/tmp/plex86/user'
make -C plugins 
make[2]: Entering directory `/tmp/plex86/user/plugins'
make -C bochs   
make[3]: Entering directory `/tmp/plex86/user/plugins/bochs'
c++ -shared -o plugin-bochs.so io.o pc_system.o state_file.o \
                 iodev/libiodev.a gui/libgui.a \
                   -lX11
/usr/bin/ld: cannot find -lX11
collect2: ld returned 1 exit status
make[3]: *** [plugin-bochs.so] Error 1
make[3]: Leaving directory `/tmp/plex86/user/plugins/bochs'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/tmp/plex86/user/plugins'
make[1]: *** [ALL] Error 2
make[1]: Leaving directory `/tmp/plex86/user'
make: *** [all] Error 2

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