net-libs/telepathy-glib-0.24.1-r1 fails to build with python 3.6

Beim Kompilieren von Gnome trat ein Fehler auf:

make: *** [Makefile:398: all] Error 2 ERROR: net-libs/telepathy-glib-0.24.1-r1::gentoo failed (compile phase):emake failed

/usr/bin/python3.6 ../tools/xincludator.py account.xml > _gen/tp-spec-account.xml.tmp
/usr/bin/python3.6 ../tools/xincludator.py account-manager.xml > _gen/tp-spec-account-manager.xml.tmp
/usr/bin/python3.6 ../tools/xincludator.py call-content.xml > _gen/tp-spec-call-content.xml.tmp
/usr/bin/python3.6 ../tools/xincludator.py call-content-media-description.xml > _gen/tp-spec-call-content-media-description.xml.tmp
/usr/bin/python3.6 ../tools/xincludator.py call-stream.xml > _gen/tp-spec-call-stream.xml.tmp
Traceback (most recent call last):
  File "../tools/xincludator.py", line 45, in <module>
    stdout.write(xml)
UnicodeEncodeError: 'ascii' codec can't encode character '\xa9' in position 293: ordinal not in range(128)
Traceback (most recent call last):
  File "../tools/xincludator.py", line 45, in <module>
    stdout.write(xml)
UnicodeEncodeError: 'ascii' codec can't encode character '\xa9' in position 393: ordinal not in range(128)
make[2]: *** [Makefile:1929: _gen/tp-spec-account-manager.xml] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: *** [Makefile:1929: _gen/tp-spec-call-content-media-description.xml] Error 1
Traceback (most recent call last):
  File "../tools/xincludator.py", line 45, in <module>
    stdout.write(xml)
UnicodeEncodeError: 'ascii' codec can't encode character '\xa9' in position 269: ordinal not in range(128)
Traceback (most recent call last):
  File "../tools/xincludator.py", line 45, in <module>
    stdout.write(xml)
UnicodeEncodeError: 'ascii' codec can't encode character '\xa9' in position 327: ordinal not in range(128)
make[2]: *** [Makefile:1929: _gen/tp-spec-account.xml] Error 1
make[2]: *** [Makefile:1929: _gen/tp-spec-call-content.xml] Error 1
Traceback (most recent call last):
  File "../tools/xincludator.py", line 45, in <module>
    stdout.write(xml)
UnicodeEncodeError: 'ascii' codec can't encode character '\xa9' in position 324: ordinal not in range(128)
make[2]: *** [Makefile:1929: _gen/tp-spec-call-stream.xml] Error 1
make[2]: Leaving directory '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/work/telepathy-glib-0.24.1/telepathy-glib'
make[1]: *** [Makefile:468: all-recursive] Error 1
make[1]: Leaving directory '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/work/telepathy-glib-0.24.1'
make: *** [Makefile:398: all] Error 2
 * ERROR: net-libs/telepathy-glib-0.24.1-r1::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=net-libs/telepathy-glib-0.24.1-r1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=net-libs/telepathy-glib-0.24.1-r1::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/work/telepathy-glib-0.24.1'
 * S: '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/work/telepathy-glib-0.24.1'

>>> Failed to emerge net-libs/telepathy-glib-0.24.1-r1, Log file:

>>>  '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/temp/build.log'

 * Messages for package net-libs/telepathy-glib-0.24.1-r1:

 * ERROR: net-libs/telepathy-glib-0.24.1-r1::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=net-libs/telepathy-glib-0.24.1-r1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=net-libs/telepathy-glib-0.24.1-r1::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/work/telepathy-glib-0.24.1'
 * S: '/var/tmp/portage/net-libs/telepathy-glib-0.24.1-r1/work/telepathy-glib-0.24.1'
localhost /ho

Der Fehler wird auf folgender Seite beschrieben: https://bugs.gentoo.org/702338
Bei mir wurde das Problem durch Änderung der make.conf behoben:

localhost /home/michi # nano -w /etc/portage/make.conf 
# This sets the language of build output to English.
# Please keep this setting intact when reporting bugs.

L10N="de"
LC_CTYPE=de_DE.UTF-8