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You're probably missing a link to libtegra_hal.a. In my case OpenCV builds and installs to: platforms/build_android_arm/install, so the lib is located at platforms/build_android_arm/install/sdk/native/3rdparty/libs/armeabi-v7a/libtegra_hal.a.
Adding -L"<opencv-dir>/platforms/build_android_arm/install/sdk/native/3rdparty/libs" -ltegra_hal, should do it.
