Bug#921657: xvfb-run: -e /dev/stderr does not work

[Thorsten Glaser <tg@mirbsd.de>]

Package: xvfb
Version: 2:1.20.3-1
Severity: minor

+ xvfb-run -a -e /dev/stderr -s '-screen 0 1024x768x24 -fbdir /var/tmp' -- ctest -O ctest.log -j8 --output-on-failure
/usr/bin/xvfb-run: 159: /usr/bin/xvfb-run: cannot create /dev/stderr: Permission denied
/usr/bin/xvfb-run: 82: /usr/bin/xvfb-run: cannot create /dev/stderr: Permission denied
+ rv=2


This could probably worked around by opening the error file
early, onto a higher file descriptor.