https://gitlab.gnome.org/GNOME/libgda/-/issues/255

Index: libgda/Gda-6.0-custom.vala
--- libgda/Gda-6.0-custom.vala.orig
+++ libgda/Gda-6.0-custom.vala
@@ -92,7 +92,10 @@ namespace Gda {
 	[CCode (cheader_filename = "libgda.h", copy_function = "g_boxed_copy", free_function = "g_boxed_free", type_id = "gda_sql_statement_get_type ()")]
 	[Compact]
 	public class SqlStatement {
+#if VALA_0_54
+#else
 		public static Gda.SqlStatementContentsInfo get_contents_infos (Gda.SqlStatementType type);
+#endif
 	}
 
 }