This error was shown when I build a android application program in Eclipse:
14:43:33 **** Incremental Build of configuration Default for project com.***.NDKD
//goto Preference → Android → NDK and choose your ndk location
or
in your hidden .bashrc file add this below line
export NDK_PATH=/home/padmakumar/android-ndk-r7b
If your NDK location is already set, the builder in the toolchain editor may be wrong. Go to project properties, C/C++ Build | Tool Chain Editor and select Android Builder as current builder.
The path for ndk-build is not set in your case. Open your .bashsrc file ( from root folder, it will be in hidden format, so Edit Menu and selection Show Hidden Files ) with Editor, go to last line and add following code,
NDK_HOME=/opt/android-ndk-r8
export NDK_HOME
Now restart your Computer and try again. For more information see my this answer.