[Bug-ssw] gtk3 - Minimum Version is at least 3.20

[Friedrich Beckmann]

Hi John,

i tried to compile the spreadsheet widget on debian jessie with gtk3 3.14.5. I noticed the following problems:

./.libs/libspread-sheet-widget.so: undefined reference to `gtk_widget_class_set_css_name'

./.libs/libspread-sheet-widget.so: undefined reference to `gtk_widget_get_allocated_size'

./.libs/libspread-sheet-widget.so: undefined reference to `gtk_container_class_install_child_properties'

collect2: error: ld returned 1 exit status

https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-class-get-css-name -> 3.20

https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-get-allocated-size -> 3.20

https://developer.gnome.org/gtk3/stable/GtkContainer.html#gtk-container-class-install-child-properties -> 3.18

I guess you need to increase the minimum required gtk3 version number to 3.20 in your configure.ac file.

Fritz