gtkdoc-fixxref and different install locations

[Stefan Kost <kost imn htwk-leipzig de>]

hi hi,

in my Makefile.am for the gtk-dco I use e.g.
FIXXREF_OPTIONS=--extra-dir=../glib --extradir=../gobject

when a user installs a package locally, fixxref of couse fails to resolve the
cross-references. Wouldn't it make sense to support something like GTK_DOC_PATH
and if that is set try every path-entry to find the index.

Stefan
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