If you grep for MM100toEMU(), you get a number of hits in oox and sc. This function was added for the OOXML export as somebody didn't notice that oox::drawingml::convertHmmToEmu() already exists. The later function is inline and is in a global header, so should be available everywhere.
Once all usage is converted, MM100toEMU() should be removed from include/oox/export/utils.hxx.
Juan Picca committed a patch related to this issue.
It has been pushed to "master":
fdo#88826: replace MM100toEMU() by convertHmmToEmu()
It will be available in 4.5.0.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.
Migrating Whiteboard tags to Keywords: (EasyHack DifficultyBeginner SkillCpp TopicCleanup)