I had set the ANDROID_NDK_HOME as /Users/Shajilshocker/Documents/Android/NDK/android-ndk-r10b using a mac osx application called Enviro
Well, this is actually not enough to make the system aware of the path. You must add this path to the PATH system variable. In your case, all you have to do is to add the following line to your terminal configuration file (which should be under your home directory, named .bashrc if you kept the default terminal, full path: ~/.bashrc):
export PATH=$PATH:/Users/Shajilshocker/Documents/Android/NDK/android-ndk-r10b
What this line does is actually adding the path to your Android NDK directory to the PATH variable. You export a variable named PATH with its current content plus the directory of your NDK.
Step by step:
.bashrcbash, then enter)