Building OpenCV 2.4.5 in android ADT: "ndk-build" not found in PATH
android, opencv
Solution
Apparently, the command that your Eclipse tries to run (when using the `${NDKROOT}/ndk-build.cmd` version) is `C:\\android\\android-ndk-r8d-windows\\ndk-build.cmd`, which is apparently correct.
The problem is that your `ndk-build.cmd` is not a windows command file. And it should be. I just downloaded the Windows version of the ndk-r8e and the ndk-build.cmd file is copied here.
Try to download the ndk again or to modify your cmd file.
Problem
I'm trying to follow this OpenCV document to import OpenCV sample projects into the android ADT, and am getting the now infamous "Program "C:\android\android-ndk-r8d-windows\ndk-build" not found in PATH" error. My OS is Windows 7 and I use cygwin for any Linux-like commands. Please note: I already downloaded the NDK package, and already set the value of NDKROOT to be my NDK root folder. I setup NDKROOT both as a system-wide environmental variable, and as an ADT's C/C++ Build environment variable, as shown below: In my NDK root folder, I made identical copies of the file "ndk-build.cmd", and renamed them as "ndk-build" and "ndk-build.sh" respectively. I chmod+x to all three ndk-build* files. Now what happens is really puzzling: If I specify the C/C++ Build command to be ${NDKROOT}/ndk-build or ${NDKROOT}/ndk-build.sh, I get the error "Program "C:\android\android-ndk-r8d-windows\ndk-build" not found in PATH". However, if I specify it to be ${NDKROOT}/ndk-build.cmd, ADT apparently finds it, but tries to run it as a Windows command, not as a bash script, as shown below: The only way I can build a project, is to open a cygwin terminal, cd to the sample project folder, and run the script (either ndk-build or ndk-build.sh), like this: I googled around for a solution. Although there are lots of "ndk-build.cmd not found in PATH" questions, I have not seen a case like mine. What is happening? I might also post my question to the openCV forum.