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
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index 63faafa..cdf4816 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -16,7 +16,7 @@
 # Script to build and run the Oboe tests on an attached Android device or emulator
 #
 # Prerequisites: 
-# - CMake on PATH. This is usually found in $ANDROID_HOME/cmake/bin. 
+# - CMake on PATH. This is usually found in $ANDROID_HOME/cmake/<version>/bin.
 # - ANDROID_NDK environment variable is set to your Android NDK location
 # e.g. $HOME/Library/Android/sdk/ndk-bundle
 # - Android device or emulator attached and accessible via adb
@@ -59,8 +59,9 @@
 fi
 
 if [ ! $(type -P ${CMAKE}) ]; then
-	echo "${CMAKE} was not found on your path. You can install it using Android Studio using Tools->Android->SDK Manager->SDK Tools."
-	exit 1
+    echo "${CMAKE} was not found on your path. You can install it using Android Studio using Tools->Android->SDK Manager->SDK Tools."
+    echo "Once done you will need to add ${HOME}/Library/Android/sdk/cmake/<current_version>/bin to your path."
+    exit 1
 fi 
 
 # Get the device ABI