Issue #21811: Anticipated fixes to 2.7 configure for OS X 10.10 Yosemite.

diff -r 1868460b751f configure.ac
--- a/configure.ac	Thu Jun 19 14:35:59 2014 -0700
+++ b/configure.ac	Thu Jun 19 14:36:20 2014 -0700
@@ -1149,8 +1149,14 @@
 
 	    # Calculate the right deployment target for this build.
 	    #
-	    cur_target=`sw_vers -productVersion | sed 's/\(10\.[[0-9]]*\).*/\1/'`
-	    if test ${cur_target} '>' 10.2; then
+		cur_target_major=`sw_vers -productVersion | \
+				sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
+		cur_target_minor=`sw_vers -productVersion | \
+				sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
+		cur_target="${cur_target_major}.${cur_target_minor}"
+		if test ${cur_target_major} -eq 10 && \
+		   test ${cur_target_minor} -ge 3
+		then
 		    cur_target=10.3
 		    if test ${enable_universalsdk}; then
 			    if test "${UNIVERSAL_ARCHS}" = "all"; then
@@ -1993,15 +1999,14 @@
 		# Use -undefined dynamic_lookup whenever possible (10.3 and later).
 		# This allows an extension to be used in any Python
 
-		if test ${MACOSX_DEPLOYMENT_TARGET} '>' 10.2
+		dep_target_major=`echo ${MACOSX_DEPLOYMENT_TARGET} | \
+				sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
+		dep_target_minor=`echo ${MACOSX_DEPLOYMENT_TARGET} | \
+				sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
+		if test ${dep_target_major} -eq 10 && \
+		   test ${dep_target_minor} -le 2
 		then
-			if test "${enable_universalsdk}"; then
-				LDFLAGS="${UNIVERSAL_ARCH_FLAGS} -isysroot ${UNIVERSALSDK} ${LDFLAGS}"
-			fi
-			LDSHARED='$(CC) -bundle -undefined dynamic_lookup'
-			LDCXXSHARED='$(CXX) -bundle -undefined dynamic_lookup'
-			BLDSHARED="$LDSHARED"
-		else
+			# building for OS X 10.0 through 10.2
 			LDSHARED='$(CC) -bundle'
 			LDCXXSHARED='$(CXX) -bundle'
 			if test "$enable_framework" ; then
@@ -2015,6 +2020,14 @@
 				LDSHARED="$LDSHARED "'-bundle_loader $(BINDIR)/python$(VERSION)$(EXE)'
 				LDCXXSHARED="$LDCXXSHARED "'-bundle_loader $(BINDIR)/python$(VERSION)$(EXE)'
 			fi
+		else
+			# building for OS X 10.3 and later
+			if test "${enable_universalsdk}"; then
+				LDFLAGS="${UNIVERSAL_ARCH_FLAGS} -isysroot ${UNIVERSALSDK} ${LDFLAGS}"
+			fi
+			LDSHARED='$(CC) -bundle -undefined dynamic_lookup'
+			LDCXXSHARED='$(CXX) -bundle -undefined dynamic_lookup'
+			BLDSHARED="$LDSHARED"
 		fi
 		;;
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