Index: head/Mk/bsd.options.mk
===================================================================
--- head/Mk/bsd.options.mk
+++ head/Mk/bsd.options.mk
@@ -100,6 +100,8 @@
 #				get enabled too.
 # ${opt}_PREVENTS		When opt is enabled, if any options in PREVENTS are
 #				also enabled, it will produce an error.
+# ${opt}_PREVENTS_MSG		Provides a message explaining why the options
+#				cannot be selected together.
 #
 # ${opt}_USE=	FOO=bar		When option is enabled, it will  enable
 #				USE_FOO+= bar
Index: head/Mk/bsd.port.mk
===================================================================
--- head/Mk/bsd.port.mk
+++ head/Mk/bsd.port.mk
@@ -5049,6 +5049,9 @@
 	@${ECHO_MSG} "====> Two or more enabled options conflict with each other"
 .  for prevents in ${OPTIONS_WRONG_PREVENTS}
 	@${ECHO_MSG} "=====> Option ${prevents} conflicts with ${OPTIONS_WRONG_PREVENTS_${prevents}} (select only one)"
+.    if defined(${prevents}_PREVENTS_MSG)
+	@${ECHO_MSG} "======> ${${prevents}_PREVENTS_MSG}"
+.    endif
 .  endfor
 .endif
 .if !empty(OPTIONS_WRONG_MULTI) || !empty(OPTIONS_WRONG_SINGLE) || !empty(OPTIONS_WRONG_RADIO) || !empty(OPTIONS_WRONG_PREVENTS)