--- libstdc++-v3/configure.host.orig	2020-03-04 19:30:03.000000000 +1100
+++ libstdc++-v3/configure.host	2020-09-09 22:17:15.146139000 +1000
@@ -222,6 +222,10 @@
     os_include_dir="os/generic"
     atomicity_dir="cpu/generic"
     ;;
+  bsdsunix*)
+    # Plain BSD attempts to share BSDSUniX files.
+    os_include_dir="os/bsd/bsdsunix"
+    ;;
   bsd*)
     # Plain BSD attempts to share FreeBSD files.
     os_include_dir="os/bsd/freebsd"
@@ -258,6 +262,9 @@
   dragonfly*)
     os_include_dir="os/bsd/dragonfly"
     ;;
+  bsdsunix*)
+    os_include_dir="os/bsd/bsdsunix"
+    ;;
   freebsd*)
     os_include_dir="os/bsd/freebsd"
     ;;
@@ -363,6 +370,9 @@
 	;;
     esac
     ;;
+  arm*-*-bsdsunix*)
+     port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
+     ;;
   arm*-*-freebsd*)
      port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
      ;;