JitPack.io does not pull up the library! Why?

Question

I have an old 12 year old project that I want to redo. I added Gradle to the project. Now I need to add a library from GitHub to the project (using Gradle), and I saw such a thing as JitPack. I configured and ran everything, but the library still doesn't pull up. What is the problem?

Gradle:

plugins {
    id 'java'
}

group 'org.opensourcephysics.cabrillo'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
    maven { url 'https://jitpack.io' }
}

dependencies {
    compile 'com.github.OpenSourcePhysics:osp:master-SNAPSHOT'
    testCompile group: 'junit', name: 'junit', version: '4.12'
}

Library from GitHub:

All my libraries:

Answer 1

What JitPack does is build your project and leverage the artifact on the fly when gradle asks for it. But for this to happen JitPack need to build the project in the repository you're asking for.

JitPack supports project such as gradle project, maven projects etc... check this link for a more detailed list of supported projects.

The repository you're trying to use OpenSourcePhysics/osp doesn't have a build script or anything like that, which makes it impossible for JitPack to build it and provide the artifact resulting for the build.