Detecting XPM on non-X11 Platforms
configure is not detecting the XPM library for a mingw32 build.
After a little investigation, I found that the configure script needs to be
modified so that it defines the symbol XPM_NUMBERS before trying to find
out which version of XPM is installed. Defining this symbol comments out
all of the XPM header except the version number declarations.
Craig Lanning