On s390x, creating the splash screen image (which runs a headless gimp, which runs plugins) hangs, as well as running tests which involve plugins. Strace shows the GIMP process hanging attempting to communicate with the plugin process.

This is hard to debug for me, 1) because access to s390x hardware is limited and 2) my knowledge about (supposedly) endianness issues together with interprocess communication is next to non-existent.

Not building on s390x at all is acceptable, users of the package are by and large on other (non mainframe) architectures.

Reproducible: Always

Steps to Reproduce:
Build gimp on s390x.
Actual Results:  
Building the splash image hangs and/or running the test suite hangs.

Expected Results:  
Building the splash screen image as well as running the test suite succeeds.