Fixes #317 also add comment about CMake path
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 5a99442..433e546 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,6 +1,7 @@
 cmake_minimum_required(VERSION 3.4.1)
 
-# TODO: Remove this line and inherit it from the host environment
+# Usually this file is called from run_tests.sh which requires the $ANDROID_NDK variable to be set so there's no need
+# to set it here. Comments below are left in intentionally in case they're useful in future.
 # This may work on Mac OS.
 # set(ANDROID_NDK $ENV{HOME}/Library/Android/sdk/ndk-bundle)
 # This may work on Linux.
@@ -17,9 +18,6 @@
 add_subdirectory(${OBOE_DIR} ./oboe-bin)
 include_directories(${OBOE_DIR}/include)
 
-# include android headers
-include_directories(${ANDROID_NDK}/sysroot/usr/include)
-
 # Build the test binary
 add_executable(testOboe
         testUtilities.cpp