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GtkSourceView 3.24 is the latest stable GtkSourceView 3 version. Before continuing this porting guide, you should use the 3.24 version without using any deprecated API.
      For GtkSourceView 4, the pkg-config name is:
      gtksourceview-4
    
To compile a program that uses GtkSourceView 4, you can for example use the following command:
      $ gcc hello.c `pkg-config --cflags --libs gtksourceview-4` -o hello
    
All the deprecated APIs have been removed.
          Only <gtksourceview/gtksource.h> can be included
          directly. There were already warnings about it in GtkSourceView 3. The
          warnings have been changed to errors.
        
Only the version 2 of the GtkSourceView language definition file format is supported (for *.lang files, used for syntax highlighting). The support for the version 1 has been dropped.
          gtk_source_completion_item_new2() has been renamed to
          gtk_source_completion_item_new().
        
          gtk_source_search_context_forward2() has been renamed to
          gtk_source_search_context_forward().
        
          gtk_source_search_context_forward_finish2() has been renamed to
          gtk_source_search_context_forward_finish().
        
          gtk_source_search_context_backward2() has been renamed to
          gtk_source_search_context_backward().
        
          gtk_source_search_context_backward_finish2() has been renamed to
          gtk_source_search_context_backward_finish().
        
          gtk_source_search_context_replace2() has been renamed to
          gtk_source_search_context_replace().
        
The GtkSourceSearchContext:settings property is now construct-only.
          The API of the
          GtkSourceView::move-lines
          keybinding signal has been simplified: the copy parameter
          was deprecated and has been removed; and the count
          parameter has been replaced by the down boolean.
        
In order to have a better *.gir file and have less metadata to generate the *.vapi for Vala, the following change has been made:
          gtk_source_completion_show() has been renamed to
          gtk_source_completion_start().
          The function conflicted with the
          GtkSourceCompletion::show signal.
          Note that in Vala this doesn't require code changes because the method
          was already renamed to start() in GtkSourceView 3.
        
Other changes in 3.99.7:
For i18n initialization, the gtk_source_init() function now needs to be called. There is also the gtk_source_finalize() function which is convenient when using memory debugging tools.