Last week I tried to build OpenCV java module so I could use it for clj-drone so I could have more fun with AR Drone 2.0. I couldn't figure out why the java module is set unavailable after cmake. This happens on both Ubuntu 12.04 and OS X 10.9. I have seen some issues regarding properly setting the JAVA_HOME and the cmake JNI file being incorrect. I tried to look at this angle, seeing why the JNI interface would not work.
However it seems "ant" is a required component and not just a recommended install as indicated by the docs. So after a "brew install ant" and "apt-get install ant" cmake is able to properly set the Java OpenCV module. I never had ant for years in my system, right now only using mvn, sbt and lein.
OpenCV 2.4.5 built just fine on Ubuntu, OSX seems to be having some c++ compile issue...
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