See https://integration.wikimedia.org/ci/job/debian-glue/
The Debian glue job do spam a serie of:
Build output
enable_eatmydata
+ echo 'EXTRAPACKAGES="$EXTRAPACKAGES eatmydata"'
+ echo 'export LD_PRELOAD="${LD_PRELOAD:+$LD_PRELOAD:}libeatmydata.so"'
+ echo '# builtin support available with pbuilder >=0.225 (otherwise ignored):'
+ echo EATMYDATA=yes
…
ERROR: ld.so: object 'libeatmydata.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.That happens early in the build since eatmydata is enabled before eatmydata extra package get installed. LD_PRELOAD should be set later.