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Both GtkSourceView 3 and GtkSourceView 4 depend on GTK+ 3. GtkSourceView 5 depends on GTK+ 4. Before porting an application to GTK+ 4, it is therefore recommended to first port to GtkSourceView 4 and then to GTK+ 4 and GtkSourceView 5.
GtkSourceView 3.24 is the latest stable GtkSourceView 3 version. You should use this 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
When porting to GtkSourceView 4, instead of doing everything in one step, you can compile intermediate 3.99.x tarballs of GtkSourceView, so that you can compile your code regularly and run the tests. Not doing all at once in one big commit, but instead doing smaller and testable commits.
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.