Build errors while trying to set up OpenCV4Android

Question

I am trying to run an OpenCV4Android in my eclipse. I am working on Linux(CentOS 6). I have done everything mentioned in this link but I am still getting build errors. I have also set the NDK path in preferences hat is not mentioned in the tutorial and tried a lot more things. When I try to build the library project the console gives:

"Cannot run program "/ndk-build": Unknown reason
 Error: Program "/ndk-build" is not found in PATH"

All the projects also have build errors and the src and gen folders in openCV4 Library is not created and the build path shows:

"Unable to get system library for the project"

When i try to change the project properties I get an error saying the page contains invalid values and I cannot change the android api version. Plz help. Have been trying to set this up since 3 days now. Thank you.

Waqas Khalid Obeidy · Accepted Answer · 2013-07-29 05:56:01Z

1

First Clean and Build you library Project alone and then try cleaning all your projects. In order to solve the "Cannot run program "/ndk-build": Unknown reason Error: Program "/ndk-build" is not found in PATH" error, Try the following steps:

Head to the project's properties. If you're using Windows, the shortcut is Alt + Enter; or simply right-click the project name to find its properties.

Go to the C/C++ Build section; under Builder Settings tab in Build command: text box you're likely to find something similar to that below, if it's empty then type in the similar text - namely: ${NDKROOT}/ndk-build.cmd where NDKROOT, as its name implies, refers to the path where your NDK root folder exists.

Now you must inform eclipse what NDKROOT equates to; as in, where is the NDK root path. You can do this by heading to (in your project's properties) C/C++ Build > Environment > press Add…

Now add your environment variable named NDKROOT (the Name) with the relevant path (Value). Note that you're to repeat this per NDK project. You would get a window similar to that below.

Press OK to the New variable input window and then OK again to the properties window.

Hopefully this will help!

answered Jul 29, 2013 at 5:56

Waqas Khalid Obeidy

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Manthan Shah Over a year ago

hey thanks..but I am still getting an error saying "Resource '/OpenCV Library - @OPENCV_VERSION@/bin' does not exist." the console gives the following messsage "/home/Manthan/Softwares/Android/android-ndk-r8e/ndk-build clean jni/Android.mk:6: OpenCV.mk: No such file or directory Android NDK: WARNING: Unsupported source file extensions in jni/Android.mk for module opencv_java make: *** No rule to make target `OpenCV.mk'. Stop. Android NDK: /OpenCV Library "

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