Bug#892215: libxcb FTBFS: KeyError: 'eventstruct'

[Helmut Grohne <helmut@subdivi.de>]

Source: libxcb
Version: 1.12-1
Severity: serious
Justification: FTBFS
User: helmutg@debian.org
Usertags: rebootstrap

Since a few days(?), libxcb FTBFS. The build ends with:

| make[1]: Entering directory '/<<PKGBUILDDIR>>/build'
| Making all in src
| make[2]: Entering directory '/<<PKGBUILDDIR>>/build/src'
| /usr/bin/python ../../src/c_client.py   -c "libxcb 1.12" -l "X Version 11" \
|         -s "3" -p /usr/lib/python2.7/dist-packages \
|          \
|         /usr/share/xcb/xproto.xml
| Traceback (most recent call last):
|   File "../../src/c_client.py", line 3294, in <module>
|     from xcbgen.state import Module
|   File "/usr/lib/python2.7/dist-packages/xcbgen/state.py", line 7, in <module>
|     from xcbgen import matcher
|   File "/usr/lib/python2.7/dist-packages/xcbgen/matcher.py", line 12, in <module>
|     from xcbgen.xtypes import *
|   File "/usr/lib/python2.7/dist-packages/xcbgen/xtypes.py", line 1221, in <module>
|     class EventStruct(Union):
|   File "/usr/lib/python2.7/dist-packages/xcbgen/xtypes.py", line 1239, in EventStruct
|     out = __main__.output['eventstruct']
| KeyError: 'eventstruct'
| make[2]: *** [Makefile:1290: xproto.c] Error 1
| make[2]: Leaving directory '/<<PKGBUILDDIR>>/build/src'
| make[1]: *** [Makefile:787: all-recursive] Error 1
| make[1]: Leaving directory '/<<PKGBUILDDIR>>/build'
| dh_auto_build: cd build && make -j1 returned exit code 2
| make: *** [debian/rules:17: build-arch] Error 2
| dpkg-buildpackage: error: debian/rules build-arch subprocess returned exit status 2

libxcb wasn't uploaded in a while. Very likely, the cause lies
elsewhere. The earliest failure I have seen was Tue, 6 Mar 2018 06:31:35
(UTC), so it should be close to the dinstall prior to that. Could it be
the xcb-proto/1.13-1 upload?

Helmut