Edit: Looks like it's no longer possible. The configure file from version 2.92 says:
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##
##
## MANDATORY for the GTK+ client
##
##
GTK_MINIMUM=3.4.0
GLIB_MINIMUM=2.32.0
GIO_MINIMUM=2.26.0
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##
##
## MANDATORY for the GTK+ client
##
##
GTK2_MINIMUM=2.22.0
GTK3_MINIMUM=3.2.0
GLIB_MINIMUM=2.28.0
GIO_MINIMUM=2.26.0
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--with-gtk=2