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