the built jar has no main manifest atttribute.

[fovea1959]

I built on Ubuntu using

./gradlew jar

which completes and produces build/lib/opencv-installer-2.0.0.jar. running the jar per the readme produces:

wegscd@wegscd-hotbox:~/src/opencv-installer/build/libs$ java -jar opencv-installer-2.0.0.jar -h
no main manifest attribute, in opencv-installer-2.0.0.jar

[fovea1959]

Found the correct command: ./gradlew fatJar.

Suggest putting build instructions in README.