OK. So IOW the only thing I probably did that helped was to add DEPEND (but
gtkglarea2.0-devel shouldn't be in it).
DEPEND="
ocaml
ocaml-compiler-libs
libgtk2.0-devel
libgtkgl2.0-devel
libgtksourceview2.0-devel
libglade2.0-devel
librsvg2-devel
libgnomeui2-devel
libgtkspell-devel
"