Issue with apcupsd and gd.h missing?

[Eric Sheesley]

When trying to do a portupgrade of apcupsd I received the following error:

checking for gd2/gd.h... no
configure: error: Found system GD library but no header file.
                                 Please find the file gd.h in your system
                                 include directories and report its location
                                 to apcupsd-users at lists.sourceforge.net

The system is Freebsd 7.1.  I checked and gd.h does exist so I'm a bit
confused as to what is going on.  The file is located in
/usr/local/include, a path that it appears the port checks.  Anyone else
experiencing this?

Any suggestions on how to fix it?

gd is installed.