libxpm4-dev virtual package weirdness?

["Kevin B. McCarty" <kmccarty@Princeton.EDU>]

Thought I would ask here before filing a bug, since there must be some
good reason for this oddness...

Why is libxpm4-dev a virtual package provided by libxaw7-dev and
libxaw8-dev?  Both of those depend upon libxpm-dev, which is the real
package that includes libXpm.so and libXpm.a.  Is there some reason that
libxpm-dev is not the package providing libxpm4-dev?

Thanks in advance for resolving this mystery,

-- 
Kevin B. McCarty <kmccarty@princeton.edu>   Physics Department
WWW: http://www.princeton.edu/~kmccarty/    Princeton University
GPG: public key ID 4F83C751                 Princeton, NJ 08544