--- libstdc++-v3/configure.host.orig	2015-06-24 09:59:28 UTC
+++ libstdc++-v3/configure.host
@@ -237,6 +237,9 @@ case "${host_os}" in
     os_include_dir="os/generic"
     atomicity_dir="cpu/generic"
     ;;
+  bsdsunix*)
+    os_include_dir="os/bsd/bsdsunix"
+    ;;
   bsd*)
     # Plain BSD attempts to share FreeBSD files.
     os_include_dir="os/bsd/freebsd"
@@ -368,7 +371,7 @@ case "${host}" in
 	;;
     esac
     ;;
-  arm*-*-freebsd*)
+  arm*-*-bsdsunix*|arm*-*-freebsd*)
      port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
      ;;
   powerpc*-*-darwin*)