Are you sure there is a problem, or are you just worried?
The only gcc-specific stuff I know of is inserted by the "gnuify" script. Some versions of the Unix build setup would automatically select whether to run gnuify depending on whether gcc was the C compiler being used. If this is no longer happening, you can hack the makefiles and try to make them compile and link "interp.c" instead of "gnu-interp.c".
But, really the build scripts should be fixed -- again -- if they are insisting on running gnuify.
(I confess I haven't looked at this code in a year or two, but I don't get the impression it is changing very much lately!)
-Lex