diff -r 78a3d3700233 configure
--- a/configure	Sun Jul 03 19:11:13 2016 -0400
+++ b/configure	Tue Jul 05 19:15:27 2016 +0800
@@ -5330,7 +5318,7 @@
 
 EOF
 
-if $CPP conftest.c >conftest.out 2>/dev/null; then
+if $CPP $CPPFLAGS conftest.c >conftest.out 2>/dev/null; then
   PLATFORM_TRIPLET=`grep -v '^#' conftest.out | grep -v '^ *$' | tr -d ' 	'`
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: $PLATFORM_TRIPLET" >&5
 $as_echo "$PLATFORM_TRIPLET" >&6; }
diff -r 78a3d3700233 configure.ac
--- a/configure.ac	Sun Jul 03 19:11:13 2016 -0400
+++ b/configure.ac	Tue Jul 05 19:15:27 2016 +0800
@@ -859,7 +859,7 @@
 
 EOF
 
-if $CPP conftest.c >conftest.out 2>/dev/null; then
+if $CPP $CPPFLAGS conftest.c >conftest.out 2>/dev/null; then
   PLATFORM_TRIPLET=`grep -v '^#' conftest.out | grep -v '^ *$' | tr -d ' 	'`
   AC_MSG_RESULT([$PLATFORM_TRIPLET])
 else