This installation requires GTK for windows to be in the path.
Available from http://www.gimp.org/~tml/gimp/win32//downloads.html .
You will need to make several small changes to the GTK installation,
including copying libgdk-0.dll to gdk-1.3.dll, and libgtk-0.dll to
gtk-1.3.dll in the same directory.  You can not rename the files!
You must create new copies with the new names.  Freepascal looks
for g*k-1.3....  But, the libraries themselves look for libg*k-0....

A sample configuration file is included, as the file gpc_config.dat.
You may put it anywhere, just specificy the full path and name of the
file from the command line or batch file that calls gpcalendar.  The
default place is in the root (c:\) directory on Windows, and you
will not need to specify the path if it is there.