Wonderful, it is still finding real bugs!
It's even obvious by inspection!
> To reproduce, start micropolis, click "play this map" and click a few
> times on different menus on the top left. The backtrace:
>
> #0 0x0000138f1af215ea in thrkill () at <stdin>:2
> #1 0x0000138f1af27889 in *_libc_abort () at
> /usr/src/lib/libc/stdlib/abort.c:52
> #2 0x0000138f1af816c8 in *_libc_memcpy (dst0=0x0, src0=0x6, length=0) at
> /usr/src/lib/libc/string/memcpy.c:65
> #3 0x0000138c9a13c7f7 in Tk_UnshareEvents (tkwin=0x138f73fd2200,
> groupId=Variable "groupId" is not available.
> ) at tkshare.c:189
> #4 0x0000138c9a14a9dd in MenuWidgetCmd (clientData=0x138f790e5b00,
> interp=0x138eeb7fdc00, argc=2, argv=0x7f7ffffda380)
> at tkmenu.c:821
>
> Patch below makes the game playable again for me.
>
> ok?
>
> Index: Makefile
> ===================================================================
> RCS file: /var/cvs/ports/games/micropolis/Makefile,v
> retrieving revision 1.17
> diff -u -p -r1.17 Makefile
> --- Makefile 11 Mar 2013 11:07:39 -0000 1.17
> +++ Makefile 18 Mar 2017 05:59:29 -0000
> @@ -3,7 +3,7 @@
> COMMENT= city-building simulation
>
> DISTNAME= micropolis-20080211
> -REVISION= 4
> +REVISION= 5
> WRKDIST= ${WRKDIR}/micropolis
>
> CATEGORIES= games
> Index: patches/patch-src_tk_tkshare_c
> ===================================================================
> RCS file: patches/patch-src_tk_tkshare_c
> diff -N patches/patch-src_tk_tkshare_c
> --- /dev/null 1 Jan 1970 00:00:00 -0000
> +++ patches/patch-src_tk_tkshare_c 18 Mar 2017 05:59:05 -0000
> @@ -0,0 +1,14 @@
> +$OpenBSD$
> +
> +fix backwards memcpy
> +--- src/tk/tkshare.c.orig Sat Mar 18 06:51:20 2017
> ++++ src/tk/tkshare.c Sat Mar 18 06:51:40 2017
> +@@ -186,7 +186,7 @@ Tk_UnshareEvents(tkwin, groupId)
> + continue;
> + }
> + if ((i+1) < groupPtr->numWindows) {
> +- memcpy((VOID *) (groupPtr->windows + i),
> ++ memmove((VOID *) (groupPtr->windows + i),
> + (VOID *) (groupPtr->windows + i + 1),
> + (groupPtr->numWindows - (i+1))*sizeof(Tk_Window *));
> + }
>
