-EXTRA_DIST += add_gc_prefix.c gcname.c if_mach.c if_not_there.c \
- hpux_test_and_clear.s gc.mak MacOS.c \
- MacProjects.sit.hqx mach_dep.c setjmp_t.c \
- threadlibs.c AmigaOS.c \
+EXTRA_DIST += extra/add_gc_prefix.c extra/gc.c extra/gcname.c \
+ extra/if_mach.c extra/if_not_there.c hpux_test_and_clear.s gc.mak \
+ extra/MacOS.c MacProjects.sit.hqx mach_dep.c extra/setjmp_t.c \
+ extra/threadlibs.c extra/AmigaOS.c \