What's the rationale behind dropping fink-libxt for system-libxt?

I have tried linking to Fink's libxt - and get the following error:

"Error: attempt to add non-widget child "ccontourform" to parent "Downloads/slp.mon.mean.nc" which supports only widgets

When I link against the system libxt, it just works. This is on Apple Silicon, MacOS 15.6, Xcode 16.4. I have tried rebuilding Fink's libxt, and linking against libxt-flat instead, but get the same result.

I have just changed computer at work, and have bootstrapped Fink, highlighting a few bugs in other packages when building on Apple Silicon with the latest Xcode. I'll submit these separately in a moment!

IIRC, that runtime error is a result of having a dependency mix'n'match libxt providers (ABI incompat of shared structs, or static vs shared, and maybe even breaks during X11 updates...something like that). The goal of having fink's own libxt was to enable packages to be fully self-consistent.

So something somewhere along the linking way from ncview is probably using system/X11-libxt?