diff -ruN binutils-2.21.1/bfd/config.bfd binutils-2.21.1-ros/bfd/config.bfd
--- binutils-2.21.1/bfd/config.bfd	2011-04-01 05:02:42.000000000 -0700
+++ binutils-2.21.1-ros/bfd/config.bfd	2013-06-07 15:54:19.380916665 -0700
@@ -519,6 +519,9 @@
   i[3-7]86-*-aros*)
     targ_defvec=bfd_elf32_i386_vec
     ;;
+  i[3-7]86-*-ros*)
+    targ_defvec=bfd_elf32_i386_vec
+    ;;
   i[3-7]86-*-chorus*)
     targ_defvec=bfd_elf32_i386_vec
     ;;
@@ -611,6 +614,11 @@
     targ_archs="$targ_archs bfd_powerpc_arch bfd_rs6000_arch"
     want64=true
     ;;
+  x86_64-*-ros*)
+    targ_defvec=bfd_elf64_x86_64_vec
+    targ_selvecs="bfd_elf32_i386_vec bfd_elf64_l1om_vec"
+    want64=true
+    ;;
   x86_64-*-dicos*)
     targ_defvec=bfd_elf64_x86_64_vec
     targ_selvecs="bfd_elf32_i386_vec bfd_elf64_l1om_vec"
diff -ruN binutils-2.21.1/config.sub binutils-2.21.1-ros/config.sub
--- binutils-2.21.1/config.sub	2010-06-01 10:53:40.000000000 -0700
+++ binutils-2.21.1-ros/config.sub	2013-06-07 15:48:57.128626160 -0700
@@ -1297,7 +1297,7 @@
 	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -auroraux* | -solaris* \
 	      | -sym* | -kopensolaris* \
 	      | -amigaos* | -amigados* | -msdos* | -newsos* | -unicos* | -aof* \
-	      | -aos* | -aros* \
+	      | -aos* | -aros* | -ros* \
 	      | -nindy* | -vxsim* | -vxworks* | -ebmon* | -hms* | -mvs* \
 	      | -clix* | -riscos* | -uniplus* | -iris* | -rtu* | -xenix* \
 	      | -hiux* | -386bsd* | -knetbsd* | -mirbsd* | -netbsd* \
diff -ruN binutils-2.21.1/configure binutils-2.21.1-ros/configure
--- binutils-2.21.1/configure	2011-06-27 00:39:00.000000000 -0700
+++ binutils-2.21.1-ros/configure	2013-06-07 15:48:57.148626299 -0700
@@ -6701,6 +6701,10 @@
   *-*-mingw* | *-*-cygwin ) RPATH_ENVVAR=PATH ;;
   *) RPATH_ENVVAR=LD_LIBRARY_PATH ;;
 esac
+# Override RPATH_ENVVAR, courtesy of Gentoo.  See this thread for more info:
+# http://www.cygwin.com/ml/binutils/2010-02/msg00266.html
+# http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo/src/patchsets/binutils/2.20/08_all_binutils-RPATH_ENVVAR-smack.patch?view=markup&revision=1.1
+RPATH_ENVVAR="cant_touch_this_nah_nah_nah"
 
 # On systems where the dynamic library environment variable is PATH,
 # gcc/ will put dynamic libraries into a subdirectory to avoid adding
diff -ruN binutils-2.21.1/gas/configure.tgt binutils-2.21.1-ros/gas/configure.tgt
--- binutils-2.21.1/gas/configure.tgt	2011-04-01 05:02:42.000000000 -0700
+++ binutils-2.21.1-ros/gas/configure.tgt	2013-06-07 16:00:33.913598069 -0700
@@ -180,6 +180,7 @@
   i386-*-beos*)				fmt=elf ;;
   i386-*-coff)				fmt=coff ;;
   i386-*-elf)				fmt=elf ;;
+  i386-*-ros)				fmt=elf ;;
   i386-*-kaos*)				fmt=elf ;;
   i386-*-bsd*)				fmt=aout em=386bsd ;;
   i386-*-netbsd0.8)			fmt=aout em=386bsd ;;
diff -ruN binutils-2.21.1/ld/configure.tgt binutils-2.21.1-ros/ld/configure.tgt
--- binutils-2.21.1/ld/configure.tgt	2011-04-01 05:03:54.000000000 -0700
+++ binutils-2.21.1-ros/ld/configure.tgt	2013-06-07 16:02:52.954598409 -0700
@@ -245,6 +245,10 @@
 x86_64-*-elf*)		targ_emul=elf_x86_64
 			targ_extra_emuls="elf_i386 elf_l1om"
 			;;
+i[3-7]86-*-ros)	targ_emul=elf_i386 ;;
+x86_64-*-ros*)		targ_emul=elf_x86_64
+			targ_extra_emuls="elf_i386 elf_l1om"
+			;;
 i[3-7]86-*-kaos*)	targ_emul=elf_i386 ;;
 i[3-7]86-*-freebsdaout* | i[3-7]86-*-freebsd[12].* | i[3-7]86-*-freebsd[12])
 			targ_emul=i386bsd ;;