Index: libexec/rc/rc.subr
===================================================================
--- libexec/rc/rc.subr
+++ libexec/rc/rc.subr
@@ -1036,6 +1036,9 @@
 		     _postcmd=\$${rc_arg}_postcmd
 
 		if [ -n "$_cmd" ]; then
+			set -a
+			eval $_env
+			set +a
 			_run_rc_precmd || return 1
 			_run_rc_doit "$_cmd $rc_extra_args" || return 1
 			_run_rc_postcmd
Index: share/man/man8/rc.subr.8
===================================================================
--- share/man/man8/rc.subr.8
+++ share/man/man8/rc.subr.8
@@ -29,7 +29,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd January 5, 2019
+.Dd August 12, 2019
 .Dt RC.SUBR 8
 .Os
 .Sh NAME
@@ -561,7 +561,18 @@
 with.
 This will be passed as arguments to the
 .Xr env 1
-utility.
+utility if
+.Va command
+is set.
+In the other case, however,
+when
+.Ar argument Ns Va _cmd
+is defined instead,
+the contents of
+.Va ${name}_env
+the will be evaluated with
+.Xr sh 1
+eval and variables set there will be exported.
 .It Va ${name}_env_file
 A file to source for environmental variables to run
 .Va command