diff -urN gdb-8.2.1.orig/gdb/configure.tgt gdb-8.2.1/gdb/configure.tgt
--- gdb-8.2.1.orig/gdb/configure.tgt	2019-01-04 12:34:10.301072023 +0100
+++ gdb-8.2.1/gdb/configure.tgt	2019-01-04 12:35:21.948388220 +0100
@@ -732,6 +732,10 @@
 x86_64-*-rtems*)
 	gdb_target_obs="${amd64_tobjs} ${i386_tobjs} i386-bsd-tdep.o"
 	;;
+x86_64-*-*)
+	# Target: amd64
+	gdb_target_obs="amd64-tdep.o i386-tdep.o i387-tdep.o"
+	;;
 xtensa*-*-linux*)
 	# Target: GNU/Linux Xtensa
 	gdb_target_obs="xtensa-linux-tdep.o symfile-mem.o linux-tdep.o"