Your package rubygem-nifti failed to build from source in current rawhide.
For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1254311 [details]
Created attachment 1254312 [details]
Created attachment 1254313 [details]
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle.
Changing version to '26'.
ilgrad's rubygem-nifti-0.0.2-6.fc27 completed http://koji.fedoraproject.org/koji/buildinfo?buildID=916679