Two different versions for gtk for mplayer, gnucash -- any way to resolve?

[Oliver Iberien]

The pkg_add version of gnucash (1.8.11) wants gtk-1.2.10_13, but the mplayer 
port version (no package?) wants 1.2.10_15. I am very new to FreeBSD and the 
ports system and would like to have both programs.  Is there some way to 
circumvent this persnicketyness --access to older versions, perhaps? or is it 
just a choice between one and the other?

Even with the newer gtk, the mplayer compiles fails with: