AWT missing about jscipopt

[kkofler]

There is kinda a bug in the JSCIP CMakeLists.txt here because it does not opt out of requiring AWT, which CMake's FindJNI.cmake unfortunately defaults to requiring:

    set(JNI_FIND_COMPONENTS AWT JVM)
    # For compatibility purposes, if no components are specified both are
    # considered required.
    set(JNI_FIND_REQUIRED_AWT TRUE)
    set(JNI_FIND_REQUIRED_JVM TRUE)

But you are missing not only the AWT JNI library, but also the Java headers (JAVA_INCLUDE_PATH, JAVA_INCLUDE_PATH2), or at least CMake cannot find them. Please make sure you install a full JDK (in distribution packages, that usually means installing the -devel or -dev subpackage of the Java/OpenJDK package) and not just the JRE parts. (And while theoretically a headless version should be sufficient, in practice, you will currently need AWT at build time, see above. There used to also be a runtime dependency on the AWT library, but I already fixed that part in commit 49e832b, so AWT is no longer required at runtime.)

I am keeping this open because of the unnecessary AWT build-time dependency, but this is mostly a user error.

[kkofler]

Depending on how you installed Java, you may also have to set the JAVA_HOME environment variable. But it should not be necessary for an installation from GNU/Linux distribution packages of OpenJDK.

[kkofler]

The AWT library is no longer required after commit 468efd0. But you will need to fix your missing Java includes for JSCIP to actually build.