not 486 gc/dbg_mlc.c --> GC_ADD_CALLER not implemented for K&R C not 514 gc/dbg_mlc.c --> GC_ADD_CALLER not implemented for K&R C not 542 gc/dbg_mlc.c --> GC_ADD_CALLER not implemented for K&R C not 63 gc/dyn_load.c --> above. Additional SVR4 variants might not be too not 294 gc/include/private/gc_locks.h --> We currently assume that if gcc is not used, we are not 943 gc/include/private/gcconfig.h Linux Sparc/a.out not supported not 2533 gc/os_dep.c --> architecture not supported