I've copied this patch from FreeBSD ports[1], and submitted it to what appears[2] to be the new upstream on gitlab.com[3].
This fixes the build for me on -current amd64. Apologies if this isn't formatted correctly---I'm unsure how to represent "mkdir mail/mlmmj/patches" using cvs diff, but otherwise this applies cleanly for me on a fresh checkout. [1] https://svnweb.freebsd.org/ports/head/mail/mlmmj/files/patch-gcc10?view=markup&pathrev=562279 [2] https://marc.info/?l=mlmmj&m=161122707912991&w=2 [3] https://gitlab.com/mlmmj/mlmmj diff -u -p -r1.21 Makefile --- Makefile 12 Jul 2019 20:47:30 -0000 1.21 +++ Makefile 14 Feb 2021 01:31:22 -0000 @@ -3,6 +3,7 @@ COMMENT= mailing list manager DISTNAME= mlmmj-1.3.0 +REVISION= 1 CATEGORIES= mail HOMEPAGE= http://mlmmj.org/ diff -u -p -N /dev/null patches/patch-include_mlmmj_h --- /dev/null Sat Feb 13 20:32:13 2021 +++ patches/patch-include_mlmmj_h Sat Feb 13 20:25:12 2021 @@ -0,0 +1,22 @@ +diff --git include/mlmmj.h include/mlmmj.h +index include/mlmmj.h 100644 +--- include/mlmmj.h ++++ include/mlmmj.h +@@ -81,7 +81,7 @@ enum subtype { + SUB_NONE /* For when an address is not subscribed at all */ + }; + +-char *subtype_strs[7]; /* count matches enum above; defined in subscriberfuncs.c */ ++extern char *subtype_strs[7]; /* count matches enum above; defined in subscriberfuncs.c */ + + enum subreason { + SUB_REQUEST, +@@ -92,7 +92,7 @@ enum subreason { + SUB_SWITCH + }; + +-char * subreason_strs[6]; /* count matches enum above; defined in subscriberfuncs.c */ ++extern char * subreason_strs[6]; /* count matches enum above; defined in subscriberfuncs.c */ + + void print_version(const char *prg); +
