ld/configure.tgt: Also add stanza for x86_64-*-elf.
     targ_selvecs="i386_elf32_vec iamcu_elf32_vec l1om_elf64_vec k1om_elf64_vec"
     want64=true
     ;;
-  x86_64-*-elf*)
+  x86_64-*-elf* | x86_64-*-rtems*)
     targ_defvec=x86_64_elf64_vec
     targ_selvecs="i386_elf32_vec iamcu_elf32_vec x86_64_elf32_vec l1om_elf64_vec k1om_elf64_vec"
     want64=true
 
        gdb_target_obs="amd64-tdep.o i386-tdep.o i387-tdep.o \
                        dicos-tdep.o i386-dicos-tdep.o amd64-dicos-tdep.o"
        ;;
+x86_64-*-elf* | x86_64-*-rtems*)
+       gdb_target_obs="amd64-tdep.o i386-tdep.o i387-tdep.o i386bsd-tdep.o"
+        ;;
 x86_64-*-linux*)
        # Target: GNU/Linux x86-64
        gdb_target_obs="amd64-tdep.o amd64-linux-tdep.o i386-tdep.o \
 
                        targ_extra_emuls=elf_i386 ;;
 i[3-7]86-*-elf*)       targ_emul=elf_i386
                        targ_extra_emuls=elf_iamcu ;;
-x86_64-*-elf*)         targ_emul=elf_x86_64
+x86_64-*-elf* | x86_64-*-rtems*)
+                       targ_emul=elf_x86_64
                        targ_extra_emuls="elf_i386 elf_iamcu elf32_x86_64 elf_l1om elf_k1om"
                        targ_extra_libpath="elf_i386 elf_iamcu elf32_x86_64 elf_l1om elf_k1om"
                        tdir_elf_i386=`echo ${targ_alias} | sed -e 's/x86_64/i386/'`