no graphics on a Dell Vostro 131

so, it's my great-grandma and has since recent update of the glib package
the following problem when trying to start the DE or even lightdm, sddm,
cdm... the reference output of X is:

ld-elf.so.1: /usr/local/lib/libglib-2.0.so0: Undefined symbol
"eventfd_at_FBSD1_6"

what I did so far:

a) make kernel and userspace
b) trying to compile devel/glib20 with an error something like cant't find
textbook.xsl to be downloaded although there.
c) trying to rebuild the linker, errors on compile: the above error
message.

When trying to add hald to /etc/rc.conf I get the same error message! Is
the linker dead or is it the new version 2.66.7_1 of glib?

what to do now?
slim works but doesn't start any session (Plasma, GNOME, XFCE4). Starting
plasma manually: same error.

Any help appreciated,

Lizbeth