I don't know the impact and to be confirmed,
but on my Slackware15.0 x86_64 VM
glibc 2.34 is missing colord-kde-icc-importer
Code:
# ldd /usr/bin/colord-kde-icc-importer | grep "not found"
/usr/bin/colord-kde-icc-importer: /lib64/libc.so.6: version 'GLIBC_2.34' not found (required by /usr/bin/colord-kde-icc-importer)
Of course, glibc on stable is 2.33