gnu: lua-lgi: Fix build.

* gnu/packages/patches/lua-lgi-fix-pango.patch: New file.
* gnu/packages/patches/lua-lgi-fix-ref.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register them here.
* gnu/packages/lua.scm (make-lua-lgi)[patches]: Add them here.

gnu/local.mk

@@ -1869,6 +1869,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/lua-5.4-liblua-so.patch			\
   %D%/packages/patches/lua-5.4-search-paths.patch		\
   %D%/packages/patches/lua-5.x-search-path-helpers.patch	\
+  %D%/packages/patches/lua-lgi-fix-pango.patch			\
+  %D%/packages/patches/lua-lgi-fix-ref.patch			\
   %D%/packages/patches/luanti-paths.patch			\
   %D%/packages/patches/lugaru-fix-sound.patch			\
   %D%/packages/patches/luit-posix.patch				\

gnu/packages/lua.scm

@@ -982,6 +982,8 @@ describing the commented declarations and functions.")
              (url "https://github.com/pavouk/lgi")
              (commit version)))
        (file-name (git-file-name name version))
+       (patches (search-patches "lua-lgi-fix-ref.patch"
+                                "lua-lgi-fix-pango.patch"))
        (sha256
         (base32 "03rbydnj411xpjvwsyvhwy4plm96481d7jax544mvk7apd8sd5jj"))))
     (build-system gnu-build-system)

gnu/packages/patches/lua-lgi-fix-pango.patch

@@ -0,0 +1,19 @@
+Upstream-Status: https://github.com/lgi-devs/lgi/pull/342
+---
+ tests/pango.lua | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/tests/pango.lua b/tests/pango.lua
+index e20a6799..ea00b903 100644
+--- a/tests/pango.lua
++++ b/tests/pango.lua
+@@ -35,7 +35,6 @@ function pango.glyphstring()
+       local offset = items[i].offset
+       local length = items[i].length
+       local analysis = items[i].analysis
+-      local pgs = Pango.GlyphString()
+-      Pango.shape(string.sub(s,1+offset), length, analysis, pgs)
++      local pgs = Pango.shape(string.sub(s,1+offset), length, analysis)
+       -- Pull out individual glyphs with pgs.glyphs
+       local glyphs = pgs.glyphs
+       check(type(glyphs) == 'table')

gnu/packages/patches/lua-lgi-fix-ref.patch

@@ -0,0 +1,44 @@
+GLib 2.86 removed the GObject.TypeClass.ref() function, replacing it
+with GObject.TypeClass.get()—this commit makes it so .get() is used in
+GLib >= 2.86, while still preserving the old behaviour on GLib < 2.86.
+
+Upstream-Status: known issue <https://github.com/lgi-devs/lgi/issues/346>
+---
+ LuaGObject/ffi.lua | 15 ++++++++++++---
+ 1 file changed, 12 insertions(+), 3 deletions(-)
+
+diff --git a/LuaGObject/ffi.lua b/LuaGObject/ffi.lua
+index 799f68e5..0695b0be 100644
+--- a/lgi/ffi.lua
++++ b/lgi/ffi.lua
+@@ -76,18 +76,27 @@ end
+ 
+ -- Creates new enum/flags table with all values from specified gtype.
+ function ffi.load_enum(gtype, name)
+-   local GObject = core.repo.GObject
++   local GLib, GObject = core.repo.GLib, core.repo.GObject
+    local is_flags = GObject.Type.is_a(gtype, GObject.Type.FLAGS)
+    local enum_component = component.create(
+       gtype, is_flags and enum.bitflags_mt or enum.enum_mt, name)
+-   local type_class = GObject.TypeClass.ref(gtype)
++   local type_class
++   -- GLib >= 2.86 deprecates GObject.TypeClass.ref() in favour of .get()
++   if GLib.check_version(2, 86, 0) then
++      type_class = GObject.TypeClass.ref(gtype)
++   else
++      type_class = GObject.TypeClass.get(gtype)
++   end
+    local enum_class = core.record.cast(
+       type_class, is_flags and GObject.FlagsClass or GObject.EnumClass)
+    for i = 0, enum_class.n_values - 1 do
+       local val = core.record.fromarray(enum_class.values, i)
+       enum_component[core.upcase(val.value_nick):gsub('%-', '_')] = val.value
+    end
+-   type_class:unref()
++   -- For GLib versions below 2.86, type_class was ref'd and needs to be unref'd
++   if GLib.check_version(2, 86, 0) then
++      type_class:unref()
++   end
+    return enum_component
+ end
+