Index: gas/configure.tgt
--- gas/configure.tgt.orig
+++ gas/configure.tgt
@@ -127,6 +127,7 @@ case ${generic_target} in
     case ${cpu}-${os} in
       aarch64*-linux-gnu_ilp32)		arch=aarch64:32 ;;
     esac ;;
+  aarch64-*-openbsd*)			fmt=elf;;
 
   alpha-*-*vms*)			fmt=evax ;;
   alpha-*-osf*)				fmt=ecoff ;;
@@ -153,6 +154,7 @@ case ${generic_target} in
   arm-*-uclinux*)			fmt=elf  em=linux ;;
   arm-*-nacl*)				fmt=elf  em=nacl ;;
   arm-*-netbsdelf*)			fmt=elf  em=nbsd ;;
+  arm-*-openbsd*)			fmt=elf  em=nbsd ;;
   arm-*-nto*)				fmt=elf ;;
   arm-wince-pe | arm-*-wince | arm*-*-mingw32ce* | arm*-*-cegcc*)
 					fmt=coff em=wince-pe ;;