diff --git a/configure/os/CONFIG.Common.darwin-x86_64 b/configure/os/CONFIG.Common.darwin-x86_64
new file mode 100644
index 000000000..4a92a2be8
--- /dev/null
+++ b/configure/os/CONFIG.Common.darwin-x86_64
@@ -0,0 +1,19 @@
+# CONFIG.Common.darwin-x86
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Definitions for darwin-x86 target builds
+# Sites may override these definitions in CONFIG_SITE.Common.darwin-x86
+#-------------------------------------------------------
+
+#
+# To build universal binaries, configure ARCH_CLASS
+# in the file CONFIG_SITE.Common.darwin-x86
+
+# Include definitions common to all Darwin targets
+include $(CONFIG)/os/CONFIG.darwinCommon.darwinCommon
+
+ARCH_DEP_CFLAGS +=   -m64
+ARCH_DEP_LDFLAGS +=  -m64
+
diff --git a/configure/os/CONFIG.darwin-x86_64.Common b/configure/os/CONFIG.darwin-x86_64.Common
new file mode 100644
index 000000000..6d2ac9c36
--- /dev/null
+++ b/configure/os/CONFIG.darwin-x86_64.Common
@@ -0,0 +1,11 @@
+# CONFIG.darwin-x86.Common
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Definitions for darwin-x86 host builds
+# Sites may override these definitions in CONFIG_SITE.darwin-x86.Common
+#-------------------------------------------------------
+
+#Include definitions common to unix hosts
+include $(CONFIG)/os/CONFIG.UnixCommon.Common