From Magnus' review mail:

* In Awt2dLibraries.gmk, for libsplashscreen, the logic for the three included external graphics libraries (gif, jpeg and png) is highly asymmetric, which make it hard to understand. It seems likely that at least the libjpeg handling is broken.


Ideally the external jpeg code should be moved to a subdir of libjavajpeg (like libpng and giflib are in libsplashscreen). This makes it more straightforward to write similar make logic for it. I also believe libsplashscreen does not correctly adhere to the --with-libjpeg flag.