Problem:

CMake Error at /usr/lib64/cmake/harfbuzz/harfbuzz-config.cmake:1:
 Parse error.  Expected a command name, got unquoted argument with text
 "@PACKAGE_INIT@".
Call Stack (most recent call first):
 cmake/MapnikFindPackage.cmake:20 (find_package)
 CMakeLists.txt:184 (mapnik_find_package)

Cause:

mock -r epel10-x86_64 with el10 packages from centos-stream-10:

<mock-chroot> sh-5.2# rpm -qf /usr/lib64/cmake/harfbuzz/harfbuzz-config.cmake
harfbuzz-devel-8.4.0-5.el10.x86_64

Verified also present in rhel 10b. But it was supposedly fixed in harfbuzz-8.4.0-2, see bz#2279802, bz#2277316 and discussion at https://lists.fedoraproject.org/archives/list/i18n-bugs@lists.fedoraproject.org/thread/AGH7J77CAI2W56DRJT5N62QJU25DNDWE/ .