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The oniguruma-devel package contains the file /usr/include/oniguruma.h. This file contains C function prototypes, which use the type UChar instead of OnigUChar. This is a bug and leads to a compilation problem for e.g. hhvm. This bug has been fixed in the devel branch of oniguruma (by replacing UChar by OnigUChar). Here are some existing bug reports (other systems, but same bug): https://www.bountysource.com/issues/37408475-onig-error-unknown-type-name-uchar https://github.com/hhvm/homebrew-hhvm/issues/50 Only Fedora 25's oniguruma is affected by this issue.
6.1.2 is already in testing. https://bodhi.fedoraproject.org/updates/FEDORA-2016-30d7ef83f9
Closing this.