Bug#829215: opam: FTBFS on hurd ("lockf" failed: Operation not supported)

[Ralf Treinen <treinen@pps.univ-paris-diderot.fr>]

Source: opam
Version: 1.2.2-5

Hello, opam fails to compile on hurd-i386 [1]:

Fatal error:
# opam-version    1.2.2
# os              unix
/«PKGBUILDDIR»/src/opam: "lockf" failed: Operation not supported
Backtrace:
  Called from file "core/opamSystem.ml", line 619, characters 2-8
  Called from file "core/opamFilename.ml", line 322, characters 13-52
  Called from file "client/opamArg.ml", line 1301, characters 4-53
Makefile:97: recipe for target 'upload' failed
make[4]: *** [upload] Error 1
make[4]: Leaving directory '/«PKGBUILDDIR»/tests'

(apparently during make tests local)

-Ralf.

[1]
https://buildd.debian.org/status/fetch.php?pkg=opam&arch=hurd-i386&ver=1.2.2-5&stamp=1458386255