Index: usr.sbin/config/config.y
===================================================================
--- usr.sbin/config/config.y
+++ usr.sbin/config/config.y
@@ -18,6 +18,7 @@
 %token	HINTS
 %token	IDENT
 %token	MAXUSERS
+%token	PROFILE
 %token	OPTIONS
 %token	NOOPTION
 %token	MAKEOPTIONS
@@ -191,6 +192,13 @@
 	System_spec
 		|
 	MAXUSERS NUMBER { maxusers = $2; } |
+	PROFILE NUMBER {
+		/* compatibility shim */
+		warnx(
+		    "%s:%d: WARNING: This version of config(8) does not support profiling directives.",
+		    yyfile, yyline);
+		warnx("WARNING: This will turn into an error when FreeBSD 13.x is no longer supported.\n");
+	} |
 	ENV ID { newenvvar($2, true); } |
 	ENVVAR ENVLINE { newenvvar($2, false); } |
 	HINTS ID {
Index: usr.sbin/config/lang.l
===================================================================
--- usr.sbin/config/lang.l
+++ usr.sbin/config/lang.l
@@ -78,6 +78,7 @@
 	{ "nomakeoption", NOMAKEOPTION },
 	{ "nomakeoptions", NOMAKEOPTION },
 	{ "maxusers",	MAXUSERS },
+	{ "profile",	PROFILE },
 	{ "option",	OPTIONS },
 	{ "options",	OPTIONS },
 	{ "nooption",	NOOPTION },
Index: usr.sbin/config/mkmakefile.c
===================================================================
--- usr.sbin/config/mkmakefile.c
+++ usr.sbin/config/mkmakefile.c
@@ -552,6 +552,14 @@
 			continue;
 		}
 		nreqs++;
+		if (eq(wd, "profiling-routine")) {
+			warn(
+			    "%s: WARNING: profiling-routine: this version of config(8) does not support profiling directives.",
+			    fname);
+			warnx(
+			    "WARNING: This will turn into an error when FreeBSD 13.x is no longer supported.\n");
+			continue;
+		}
 		if (std)
 			errout("standard entry %s has optional inclusion specifier %s!\n",
 			       this, wd);