empty dirs in glib-2.0

["Kövesdi György" <kgy@teledigit.eu>]

Hi,

Compiling the Angstrom Linux, in the file openembedded-core/meta/recipes-
core/glib-2.0/glib-2.0_2.30.2.bb (a85f283ffae5407b23532ce2262142ee2d986af2) 
there are the followings:

do_install_append() {
  # remove some unpackaged files
  rm -f ${D}${libdir}/gdbus-2.0/codegen/*.pyc
  rm -f ${D}${libdir}/gdbus-2.0/codegen/*.pyo
  # and empty dirs
  rmdir ${D}${libdir}/gio/modules/
  rmdir ${D}${libdir}/gio/
}

I have problems with the "empty dirs" section: the directory is not empty and 
therefore the installation fails here.
I replaced it with "rm -rf ..." and now it worx but i do not sure it is a good 
solution.
Why these directories are expected to be empty? What does it mean if they are 
not?

Thanx in advance
Gyorgy Kovesdi