Tests fail without gdk-pixbuf compiled with jpeg support:
=GdkPixbuf-LOG **: gdk_pixbuf_from_pixdata() called on: at t/GdkPixbuf.t line 185.
GdkPixbuf-LOG **: Encoding rle at t/GdkPixbuf.t line 185.
GdkPixbuf-LOG **: Dimensions: 4 x 5 at t/GdkPixbuf.t line 185.
GdkPixbuf-LOG **: Rowstride: 16, Length: 91 at t/GdkPixbuf.t line 185.
GdkPixbuf-LOG **: Copy pixels == true at t/GdkPixbuf.t line 185.
Image type 'jpeg' is not supported at t/GdkPixbuf.t line 200.
t/GdkPixbuf.t ...................... Dubious, test returned 255 (wstat 65280, 0xff00)
Package-Manager: Portage-2.3.6, Repoman-2.3.2
virtual/perl-ExtUtils-MakeMaker
>=dev-perl/ExtUtils-Depends-0.300.0
>=dev-perl/ExtUtils-PkgConfig-1.30.0
+ test? ( x11-libs/gdk-pixbuf[jpeg] )
"
src_test(){