diff --git a/configure b/configure
index 0e028ff..3656e62 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 65033 .
+# From configure.in Revision: 65061 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for python 2.6.
 #
@@ -4667,7 +4667,7 @@
 
 
 		BASECFLAGS="${UNIVERSAL_ARCH_FLAGS} -isysroot ${UNIVERSALSDK} ${BASECFLAGS}"
-		tgt=`sw_vers -productVersion | sed 's/\(10\.0-9*\).*/\1/'`
+		tgt=`sw_vers -productVersion | sed 's/\(10\.[0-9]*\).*/\1/'`
 		if test "${UNIVERSALSDK}" != "/" -a "${tgt}" '>' '10.4' ; then
 			CFLAGS="${UNIVERSAL_ARCH_FLAGS} -isysroot ${UNIVERSALSDK} ${CFLAGS}"
 		fi
diff --git a/configure.in b/configure.in
index 67d7f96..0c96c5a 100644
--- a/configure.in
+++ b/configure.in
@@ -925,7 +925,7 @@
 
 
 		BASECFLAGS="${UNIVERSAL_ARCH_FLAGS} -isysroot ${UNIVERSALSDK} ${BASECFLAGS}"
-		tgt=`sw_vers -productVersion | sed 's/\(10\.[0-9]*\).*/\1/'`
+		tgt=`sw_vers -productVersion | sed 's/\(10\.[[0-9]]*\).*/\1/'`
 		if test "${UNIVERSALSDK}" != "/" -a "${tgt}" '>' '10.4' ; then
 			CFLAGS="${UNIVERSAL_ARCH_FLAGS} -isysroot ${UNIVERSALSDK} ${CFLAGS}"
 		fi