2.5. Include the C Header Files

The CCode attribute cheader_filename defines the comma separated list of headers to include in the generated C. For example,

[CCode (cheader_filename = "libfoo/foo.h")]
namespace Foo {
    // bindings

Try to apply headers to namespaces or containing types. Applying it to an outer context prevents having to repeat it in the inner context.

A library will often have a single header that includes a number of sub-headers. For an example see the https://gitlab.gnome.org/GNOME/glib/-/blob/main/glib/glib.h header. In these cases only the main header file needs to be included.