One or more directories are not included within this
package and/or its sub-packages:

=> rkward-0.5.0b-7.fc10.i386 (rawhide-development-i386)
/usr/lib/R/library/rkward

[...]

Further information:

https://fedoraproject.org/wiki/Packaging/ReviewGuidelines

MUST: A package must own all directories that it creates. If it does not
create a directory that it uses, then it should require a package which
does create that directory.

https://fedoraproject.org/wiki/Packaging/Guidelines#FileAndDirectoryOwnership
https://fedoraproject.org/wiki/Packaging/UnownedDirectories