As I mentioned before, gcc 4.2 in gcc trunk has had libgfortran's
sover bumped from .1 to .2 creating a rift with the current gcc4
package in 10.4 unstable. There will be one other conflict in gcc 4.2
shortly. The current gcc4 uses an unapproved patch to create a
new __Unwind_GetIPInfo symbol which isn't present in release
libgcc.10.4 shared library. The appropriate fix is about to be
introduced into gcc trunk (of testing for __Unwind_GetIPInfo in
the versioning information before trying to use it in libstdc++, etc).

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26792

This will mean that the released gcc 4.2 will not have or use
the __Unwind_GetIPInfo symbol when built with the 10.4 
MACOSX_DEPLOYMENT_TARGET (as fink 10.4 does). This is yet another
reason to have a new gcc4 release and force all packages that
build against gcc4 to be version bumped for rebuilding against
the new gcc4.
               Jack

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