diff --git a/util/xcompile/xcompile b/util/xcompile/xcompile
index 97dd7c4004..07bcde7a6d 100755
--- a/util/xcompile/xcompile
+++ b/util/xcompile/xcompile
@@ -128,6 +128,10 @@ detect_special_flags() {
 	testcc "$GCC"      "$CFLAGS_GCC -Wno-unused-but-set-variable " &&
 		CFLAGS_GCC="$CFLAGS_GCC -Wno-unused-but-set-variable "
 
+	# Check for an operational -m32/-m64
+	testcc "$GCC"      "$CFLAGS_GCC -m$TWIDTH " &&
+		CFLAGS_GCC="$CFLAGS_GCC -m$TWIDTH "
+
 	# Use bfd linker instead of gold if available:
 	testcc "$GCC"      "$CFLAGS_GCC -fuse-ld=bfd" &&
 		CFLAGS_GCC="$CFLAGS_GCC -fuse-ld=bfd" && LINKER_SUFFIX='.bfd'
@@ -201,7 +205,7 @@ EOF
 }
 
 # Architecture definitions
-SUPPORTED_ARCHITECTURES="arm arm64 mipsel riscv x86"
+SUPPORTED_ARCHITECTURES="arm arm64 mipsel riscv x64 x86"
 
 arch_config_arm() {
 	TARCH="arm"
@@ -229,6 +233,14 @@ arch_config_riscv() {
 	TABI="elf"
 }
 
+arch_config_x64() {
+	TARCH="x86_64"
+	TBFDARCHS="x86-64"
+	TCLIST="x86_64"
+	TWIDTH="64"
+	TABI="elf"
+}
+
 arch_config_x86() {
 	TARCH="x86_32"
 	TBFDARCHS="i386"