zziplib uses LDFLAGS="--export-dynamic". Linker flags starting with -- are actually silently ignored on linker command lines. 4.6 just doesn't accept them. See http://gcc.gnu.org/PR46410 or http://gcc.gnu.org/PR47390.
Created attachment 261773 [details, diff] zziplib-0.13.60-gcc46.patch
Given comments in those bugs, it seems that -export-all-symbols should be fixed too.
are you talking about in zziplib or gcc?
i tweaked the patch to apply against configure (since we're avoiding running autotools atm) and added to the tree. cheers !
Actually this bug makes the linking of zziplib fail on prefix/darwin/macos/10.5/x64, with gcc-4.2.1.