--- gcc/config/i386/t-kbsdsunix.orig	2020-03-04 19:30:00.000000000 +1100
+++ gcc/config/i386/t-kbsdsunix	2020-09-22 11:56:45.205890000 +1000
@@ -0,0 +1,5 @@
+MULTIARCH_DIRNAME = $(call if_multiarch,i386-kbsdsunix-gnu)
+
+# MULTILIB_OSDIRNAMES are set in t-linux64.
+KBSDSUNIX_OS = $(filter kbsdsunix%, $(word 3, $(subst -, ,$(target))))
+MULTILIB_OSDIRNAMES := $(filter-out mx32=%,$(subst linux,$(KBSDSUNIX_OS),$(MULTILIB_OSDIRNAMES)))