Failed self test on Hurd

[Peter <peter@pblackman.plus.com>]

Hi,

duma is FTBFS on Hurd because a self test fails.
https://buildd.debian.org/status/fetch.php?pkg=duma&arch=hurd-i386&ver=2.5.21-2&stamp=1633376424&raw=0 
<https://buildd.debian.org/status/fetch.php?pkg=duma&arch=hurd-i386&ver=2.5.21-2&stamp=1633376424&raw=0>

That part of the build log reads

.
Testing DUMA (static library):
./dumatest
GNUmakefile:373: recipe for target 'test' failed
make[1]: *** [test] Killed

dh_auto_test: error: make -j1 test returned exit code 2
debian/rules:8: recipe for target 'binary-arch' failed
make: *** [binary-arch] Error 255
dpkg-buildpackage: error: debian/rules binary-arch subprocess returned exit status 2

I'm wondering what Error 255 means on Hurd, and whether this could be anything to do with threading?
Also it might be useful to know the output of "uname -s" is on Hurd, as the makefile branches on the value.

Cheers,
Peter