Replication with fltk.1.4.x + Linux (SciLinux 7 in my case):

1. ./configure --enable-localpng
2. make
3. `test/native-filechooser
4. Click "Pick File"
5. Application core dumps with these errors:

(native-filechooser:15756): GdkPixbuf-WARNING **: 13:34:20.782: Bug! loader 'png' didn't set an error on failure
(native-filechooser:15756): Gtk-WARNING **: 13:34:20.782: Could not load a pixbuf from icon theme.
This may indicate that pixbuf loaders or the mime database could not be found.
(native-filechooser:15756): GdkPixbuf-WARNING **: 13:34:20.782: Bug! loader 'png' didn't set an error on failure
**
Gtk:ERROR:gtkiconhelper.c:494:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /usr/share/icons/Adwaita/16x16/status/image-missing.png: Internal error: Image loader module ?png? failed to complete an operation, but didn?t give a reason for the failure (gdk-pixbuf-error-quark, 5)
Abort (core dumped)

I assume this is due to a difference in GTK's version of PNG and FLTK's.

Works fine if --enable-localpng is not used.

Apparently the GTK file browser doesn't like to be linked with FLTK's PNG library.

I'm not sure if this is avoidable, but it's very deadly for the app.

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