Gnome evolution hanging at startup

Hi,
I do not know what BLFS stands for, but you already provided the
Evolution versions, thus no problem with that.

Try to run Evolution from a terminal, it can write runtime warnings on
the console. Ideally install debug info packages for the evolution,
evolution-data-server, glib2 and gtk3 at least and then run Evolution
under gdb, like this:

gdb evolution --ex r

and when the Evolution is stuck, press Ctrl+C in the terminal with the
gdb and issue “t a a bt” command in there. It’ll print backtraces for
all threads, showing what the process is waiting for.

You can quit gdb with “q” command.
Bye,
Milan