checking for rpath... yes
checking for KDE... configure: error:
in the prefix, you've chosen, are no KDE headers installed. This will fail.
So, check this please and use another prefix!

!!! ERROR: media-video/kplayer-0.5.3 failed.
!!! Function kde_src_compile, Line 2183, Exitcode 1
!!! died running ./configure, kde_src_compile:configure
!!! If you need support, post the topmost build error, NOT this status message.