Note Makefile.native differences

.travis.yml

@@ -21,7 +21,7 @@ script:
   make clean;
   make;
   make clean;
-  make -f Makefile.native;
+  make -f scripts/make_native/Makefile.native;
 
 before_deploy:
   - unset CFLAGS

scripts/make_native/Makefile.native

@@ -1,3 +1,10 @@
+# This Makefile optimizes native builds. It
+#   - enables -O3 optimization
+#   - builds for native architecture (-march=native)
+#   - does not have debug build option
+#
+# NOTE: This file is used in Travis CI for stricter test builds
+
 VERSION = 1.3
 
 PREFIX ?= /usr/local