https://gitlab.gnome.org/GNOME/libgit2-glib/-/merge_requests/40 (modified to drop const changes, dep increase)

From a76fdf96c3af9ce9d21a3985c4be8a1aa6eea661 Mon Sep 17 00:00:00 2001
From: Dominique Leuenberger <dimstar@opensuse.org>
Date: Fri, 5 Apr 2024 10:28:16 +0200
Subject: [PATCH] build: Fix build against, and require, libgit2 1.8.0

---
 libgit2-glib/ggit-clone-options.c        | 1 +
 libgit2-glib/ggit-cred-ssh-interactive.c | 2 +-
 libgit2-glib/ggit-remote-callbacks.h     | 1 +
 libgit2-glib/ggit-repository.c           | 4 ++--
 libgit2-glib/ggit-types.h                | 3 ++-
 meson.build                              | 2 +-
 6 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/libgit2-glib/ggit-clone-options.c b/libgit2-glib/ggit-clone-options.c
index b47fdb1..30c7d86 100644
--- a/libgit2-glib/ggit-clone-options.c
+++ b/libgit2-glib/ggit-clone-options.c
@@ -19,6 +19,7 @@
  */
 
 #include <git2.h>
+#include <git2/sys/errors.h>
 #include <gio/gio.h>
 
 #include "ggit-clone-options.h"
diff --git a/libgit2-glib/ggit-remote-callbacks.h b/libgit2-glib/ggit-remote-callbacks.h
index 3005ff4..2340712 100644
--- a/libgit2-glib/ggit-remote-callbacks.h
+++ b/libgit2-glib/ggit-remote-callbacks.h
@@ -24,6 +24,7 @@
 
 #include <glib-object.h>
 #include <git2.h>
+#include <git2/sys/errors.h>
 #include <libgit2-glib/ggit-cred.h>
 
 G_BEGIN_DECLS
diff --git a/libgit2-glib/ggit-types.h b/libgit2-glib/ggit-types.h
index 7e28975..2a2ed99 100644
--- a/libgit2-glib/ggit-types.h
+++ b/libgit2-glib/ggit-types.h
@@ -355,7 +355,8 @@ typedef enum
 	GGIT_CONFIG_LEVEL_XDG         = 3,
 	GGIT_CONFIG_LEVEL_GLOBAL      = 4,
 	GGIT_CONFIG_LEVEL_LOCAL       = 5,
-	GGIT_CONFIG_LEVEL_APP         = 6,
+	GGIT_CONFIG_LEVEL_WORKTREE    = 6,
+	GGIT_CONFIG_LEVEL_APP         = 7,
 	GGIT_CONFIG_LEVEL_HIGHEST     = -1
 } GgitConfigLevel;