Autotools build system have been dropped. Meson is the only supported build system in HarfBuzz going forward. See https://github.com/harfbuzz/harfbuzz/releases/tag/9.0.0
Sounds like what needs to be done :) From IRC, I asked if there were any objections: 12:38:00 am - cloph_away: […] not really / wanted to look into meson anyway for the cairo update or rather to not having to deal with libtool anymore 12:39:50 am - cloph_away: but that would involve adding meson to lode for mac for example amongst other things
Khaled Hosny committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/71ed0680be1d1f7af7478a81d0a72027bffe8d61 tdf#161981, tdf#157922, tdf#163892 Upgrade HarfBuzz to 11.0.1 It will be available in 25.8.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.