I've changed the Racket CGC implementation --- which is mostly used only to build the normal Racket variant --- to use SGC by default, instead of the Boehm GC. The intent of the switch is to make the more portable GC the default.
If you have an existing build in a repo checkout, then `make` is likely to fail, because the makefile dependencies are not precise enough to deal with the switch. You can discard your old build directory, or it might work to simply delete <builddir>/racket/libmzgc.a If you're using CGC and want to continue using the Boehm GC, then provide `--disable-sgc` to `configure`. I've tuned SGC to bring its performance closer to the Boehm GC, but it's still slower. _________________________ Racket Developers list: http://lists.racket-lang.org/dev
