[MacPorts] #38819: librsvg: should call gdk-pixbuf-query-loaders --update-cache

[MacPorts]

#38819: librsvg: should call gdk-pixbuf-query-loaders --update-cache
-----------------------+--------------------------------
 Reporter:  gui_dos@…  |      Owner:  macports-tickets@…
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.1.3
 Keywords:             |       Port:  librsvf
-----------------------+--------------------------------
 If you don't update the loaders cache, trying to build gnome-themes-
 standard (#38635)
 fails with the error:
 {{{
 gtk.gresource.xml: Error on line 41 char 1: Error processing input file
 with to-pixdata:
 failed to load "./assets/dnd-counter.svg": Couldn't recognize the image
 file format for file './assets/dnd-counter.svg'
 }}}

 It can be solved by adding:
 {{{
 post-activate {
     system "${prefix}/bin/gdk-pixbuf-query-loaders --update-cache"
 }
 }}}

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Ticket URL: <https://trac.macports.org/ticket/38819>
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