Only in libpeas-1.30.0: change-to-lua53.patch
diff -ur libpeas-1.30.0/libpeas/peas-utils.c libpeas-1.30.0.new/libpeas/peas-utils.c
--- libpeas-1.30.0/libpeas/peas-utils.c	2021-03-19 21:24:38.792421600 -0300
+++ libpeas-1.30.0.new/libpeas/peas-utils.c	2021-06-30 15:15:43.698337701 -0300
@@ -35,7 +35,7 @@
 };
 
 static const gchar *all_plugin_loader_modules[] = {
-  "cloader", "lua51loader", "pythonloader", "python3loader"
+  "cloader", "lua53loader", "pythonloader", "python3loader"
 };
 
 static const gint conflicting_plugin_loaders[PEAS_UTILS_N_LOADERS][2] = {
diff -ur libpeas-1.30.0/loaders/lua5.3/meson.build libpeas-1.30.0.new/loaders/lua5.3/meson.build
--- libpeas-1.30.0/loaders/lua5.3/meson.build	2021-03-19 21:24:38.792421600 -0300
+++ libpeas-1.30.0.new/loaders/lua5.3/meson.build	2021-06-30 15:12:48.122339674 -0300
@@ -1,39 +1,39 @@
-lua51_loader_name = 'lua51loader'
+lua53_loader_name = 'lua53loader'
 
-lua51_lgi_version = lua51_lgi_dep.version()
-lua51_lgi_version_arr = lua51_lgi_version.split('.')
-lua51_lgi_version_major = lua51_lgi_version_arr[0].to_int()
-lua51_lgi_version_minor = lua51_lgi_version_arr[1].to_int()
-lua51_lgi_version_micro = lua51_lgi_version_arr[2].to_int()
+lua53_lgi_version = lua53_lgi_dep.version()
+lua53_lgi_version_arr = lua53_lgi_version.split('.')
+lua53_lgi_version_major = lua53_lgi_version_arr[0].to_int()
+lua53_lgi_version_minor = lua53_lgi_version_arr[1].to_int()
+lua53_lgi_version_micro = lua53_lgi_version_arr[2].to_int()
 
-lua51_loader_c = files(
+lua53_loader_c = files(
   'peas-lua-internal.c',
   'peas-lua-utils.c',
   'peas-plugin-loader-lua.c',
 )
 
-subdir('resources') # Declares 'lua51_loader_res'
+subdir('resources') # Declares 'lua53_loader_res'
 
-lua51_loader_deps = [
+lua53_loader_deps = [
   libpeas_dep,
-  lua51_dep,
-  lua51_lgi_dep,
+  lua53_dep,
+  lua53_lgi_dep,
   luajit_dep,
 ]
 
-lua51_loader_c_args = [
+lua53_loader_c_args = [
   '-DHAVE_CONFIG_H',
-  '-DLGI_MAJOR_VERSION=@0@'.format(lua51_lgi_version_major),
-  '-DLGI_MINOR_VERSION=@0@'.format(lua51_lgi_version_minor),
-  '-DLGI_MICRO_VERSION=@0@'.format(lua51_lgi_version_micro),
+  '-DLGI_MAJOR_VERSION=@0@'.format(lua53_lgi_version_major),
+  '-DLGI_MINOR_VERSION=@0@'.format(lua53_lgi_version_minor),
+  '-DLGI_MICRO_VERSION=@0@'.format(lua53_lgi_version_micro),
 ]
 
-lua51_loader_sha = shared_module(
-  lua51_loader_name,
-  lua51_loader_c + lua51_loader_res,
+lua53_loader_sha = shared_module(
+  lua53_loader_name,
+  lua53_loader_c + lua53_loader_res,
   include_directories: rootdir,
-  dependencies: lua51_loader_deps,
-  c_args: lua51_loader_c_args,
+  dependencies: lua53_loader_deps,
+  c_args: lua53_loader_c_args,
   install: true,
   install_dir: join_paths(
     pkglibdir,
diff -ur libpeas-1.30.0/loaders/lua5.3/peas-lua-utils.c libpeas-1.30.0.new/loaders/lua5.3/peas-lua-utils.c
--- libpeas-1.30.0/loaders/lua5.3/peas-lua-utils.c	2021-03-19 21:24:38.792421600 -0300
+++ libpeas-1.30.0.new/loaders/lua5.3/peas-lua-utils.c	2021-06-30 15:13:49.362338986 -0300
@@ -196,7 +196,7 @@
    *
    * https://bugzilla.gnome.org/show_bug.cgi?id=673101
    */
-  resource_path = g_strconcat ("/org/gnome/libpeas/loaders/lua5.1/",
+  resource_path = g_strconcat ("/org/gnome/libpeas/loaders/lua5.3/",
                                name, NULL);
   lua_resource = g_resources_lookup_data (resource_path,
                                           G_RESOURCE_LOOKUP_FLAGS_NONE,
diff -ur libpeas-1.30.0/loaders/lua5.3/resources/meson.build libpeas-1.30.0.new/loaders/lua5.3/resources/meson.build
--- libpeas-1.30.0/loaders/lua5.3/resources/meson.build	2021-03-19 21:24:38.793421700 -0300
+++ libpeas-1.30.0.new/loaders/lua5.3/resources/meson.build	2021-06-30 15:17:58.952336181 -0300
@@ -1,4 +1,4 @@
-lua51_loader_res = gnome.compile_resources(
+lua53_loader_res = gnome.compile_resources(
   'peas-lua-resources',
   'peas-lua.gresource.xml',
   export: true,
diff -ur libpeas-1.30.0/loaders/lua5.3/resources/peas-lua.gresource.xml libpeas-1.30.0.new/loaders/lua5.3/resources/peas-lua.gresource.xml
--- libpeas-1.30.0/loaders/lua5.3/resources/peas-lua.gresource.xml	2021-03-19 21:24:38.793421700 -0300
+++ libpeas-1.30.0.new/loaders/lua5.3/resources/peas-lua.gresource.xml	2021-06-30 15:14:37.225338448 -0300
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <gresources>
-  <gresource prefix="/org/gnome/libpeas/loaders/lua5.1">
+  <gresource prefix="/org/gnome/libpeas/loaders/lua5.3">
     <file alias="internal.lua">peas-lua-internal.lua</file>
     <file alias="strict.lua">peas-lua-strict.lua</file>
   </gresource>
diff -ur libpeas-1.30.0/loaders/meson.build libpeas-1.30.0.new/loaders/meson.build
--- libpeas-1.30.0/loaders/meson.build	2021-03-19 21:24:38.793421700 -0300
+++ libpeas-1.30.0.new/loaders/meson.build	2021-06-30 15:08:33.044342541 -0300
@@ -1,5 +1,5 @@
-if build_lua51_loader == true
-  subdir('lua5.1')
+if build_lua53_loader == true
+  subdir('lua5.3')
 endif
 
 if build_python2_loader == true
diff -ur libpeas-1.30.0/meson.build libpeas-1.30.0.new/meson.build
--- libpeas-1.30.0/meson.build	2021-03-19 21:24:38.795421600 -0300
+++ libpeas-1.30.0.new/meson.build	2021-06-30 15:04:59.718344939 -0300
@@ -135,24 +135,24 @@
 endif
 
 pygobject_dep = dependency('pygobject-3.0', version: pygobject_req, required: false)
-lua51_dep = dependency('lua51', version: lua_req, required: false)
-if not lua51_dep.found()
-  lua51_dep = dependency('lua-5.1', version: lua_req, required: false)
+lua53_dep = dependency('lua53', version: lua_req, required: false)
+if not lua53_dep.found()
+  lua53_dep = dependency('lua-5.3', version: lua_req, required: false)
 endif
 luajit_dep = dependency('luajit', version: luajit_req, required: false)
 lua_lgi_found = false
 lua_lgi_ver = 'not found'
-lua51_prg = find_program('lua5.1', required: false)
-if not lua51_prg.found()
-  lua51_prg = find_program('lua51', required: false)
+lua53_prg = find_program('lua5.3', required: false)
+if not lua53_prg.found()
+  lua53_prg = find_program('lua53', required: false)
 endif
 luajit_prg = find_program('luajit', required: false)
 xmllint_prg = find_program('xmllint', required: false)
 
 if cc.get_id() == 'msvc'
   if luajit_prg.found()
-    # luajit has lua51.lib as its import library
-    lua_names = ['lua51']
+    # luajit has lua53.lib as its import library
+    lua_names = ['lua53']
   else
     lua_names = ['lua53', 'lua52', 'lua51']
   endif
@@ -160,17 +160,17 @@
   lua_headers = ['lua.h', 'lualib.h', 'lauxlib.h']
   # On Windows, the lua program may be named as lua.exe
   foreach lua: lua_names + ['lua']
-    if not lua51_prg.found() and not luajit_prg.found()
-      lua51_prg = find_program(lua, required: false)
+    if not lua53_prg.found() and not luajit_prg.found()
+      lua53_prg = find_program(lua, required: false)
     endif
-    if lua51_prg.found()
+    if lua53_prg.found()
       if lua != 'lua'
-        lua51_dep = cc.find_library(lua, has_headers: lua_headers, required: false)
+        lua53_dep = cc.find_library(lua, has_headers: lua_headers, required: false)
       endif
     endif
   endforeach
 
-  if not lua51_dep.found() and not luajit_dep.found()
+  if not lua53_dep.found() and not luajit_dep.found()
     foreach lualib: lua_names
       if luajit_prg.found()
         if not luajit_dep.found()
@@ -178,9 +178,9 @@
         endif
       endif
 
-      if lua51_prg.found()
-        if not lua51_dep.found()
-          lua51_dep = cc.find_library(lualib, has_headers: lua_headers, required: false)
+      if lua53_prg.found()
+        if not lua53_dep.found()
+          lua53_dep = cc.find_library(lualib, has_headers: lua_headers, required: false)
         endif
       endif
     endforeach
@@ -189,7 +189,7 @@
 
 lua_found = false
 
-if (luajit_dep.found() and luajit_prg.found()) or (lua51_dep.found() and lua51_prg.found())
+if (luajit_dep.found() and luajit_prg.found()) or (lua53_dep.found() and lua53_prg.found())
   lua_found = true
 endif
 
@@ -197,13 +197,13 @@
     if luajit_prg.found()
         lua_prg = luajit_prg
     else
-        lua_prg = lua51_prg
+        lua_prg = lua53_prg
     endif
     lua_lgi_check = run_command(lua_prg, ['-e', 'print(require("lgi")._VERSION)'])
     if lua_lgi_check.returncode() == 0
         lua_lgi_ver = lua_lgi_check.stdout().strip()
         if lua_lgi_ver.version_compare(lua_lgi_req)
-            lua51_lgi_dep = declare_dependency(version: lua_lgi_ver)
+            lua53_lgi_dep = declare_dependency(version: lua_lgi_ver)
             lua_lgi_found = true
         endif
     endif
@@ -284,10 +284,10 @@
   generate_gir = false
 endif
 
-build_lua51_loader = get_option('lua51')
-lua51_found = (luajit_dep.found() or lua51_dep.found()) and lua_lgi_found
-if build_lua51_loader and not lua51_found
-  build_lua51_loader = false
+build_lua53_loader = get_option('lua53')
+lua53_found = (luajit_dep.found() or lua53_dep.found()) and lua_lgi_found
+if build_lua53_loader and not lua53_found
+  build_lua53_loader = false
 endif
 
 build_python2_loader = get_option('python2')
@@ -333,7 +333,7 @@
   '     Glade catalog: @0@'.format(install_glade_catalog),
   '     GTK+ widgetry: @0@'.format(build_gtk_widgetry),
   '     Introspection: @0@'.format(generate_gir),
-  '   Lua 5.1 support: @0@'.format(build_lua51_loader),
+  '   Lua 5.3 support: @0@'.format(build_lua53_loader),
   '  Python 2 support: @0@'.format(build_python2_loader),
   '  Python 3 support: @0@'.format(build_python3_loader),
   '',
diff -ur libpeas-1.30.0/meson_options.txt libpeas-1.30.0.new/meson_options.txt
--- libpeas-1.30.0/meson_options.txt	2021-03-19 21:24:38.795421600 -0300
+++ libpeas-1.30.0.new/meson_options.txt	2021-06-30 15:05:36.437344526 -0300
@@ -1,6 +1,6 @@
-option('lua51',
+option('lua53',
        type: 'boolean', value: true,
-       description: 'Enable Lua 5.1 support (requires lua-lgi)')
+       description: 'Enable Lua 5.3 support (requires lua-lgi)')
 
 option('python2',
        type: 'boolean', value: false,
diff -ur libpeas-1.30.0/peas-demo/plugins/meson.build libpeas-1.30.0.new/peas-demo/plugins/meson.build
--- libpeas-1.30.0/peas-demo/plugins/meson.build	2021-03-19 21:24:38.796421800 -0300
+++ libpeas-1.30.0.new/peas-demo/plugins/meson.build	2021-06-30 15:23:02.830332766 -0300
@@ -1,6 +1,6 @@
 subdir('helloworld')
 
-if build_lua51_loader == true
+if build_lua53_loader == true
   subdir('luahello')
 endif
 
diff -ur libpeas-1.30.0/tests/libpeas/extension-lua.c libpeas-1.30.0.new/tests/libpeas/extension-lua.c
--- libpeas-1.30.0/tests/libpeas/extension-lua.c	2021-03-19 21:24:38.804421700 -0300
+++ libpeas-1.30.0.new/tests/libpeas/extension-lua.c	2021-06-30 15:17:06.569336770 -0300
@@ -154,9 +154,9 @@
   PeasPluginInfo *info;
 
   testing_util_push_log_hook ("Error loading plugin "
-                              "'extension-lua51-nonexistent'*");
+                              "'extension-lua53-nonexistent'*");
 
-  info = peas_engine_get_plugin_info (engine, "extension-lua51-nonexistent");
+  info = peas_engine_get_plugin_info (engine, "extension-lua53-nonexistent");
 
   g_assert (!peas_engine_load_plugin (engine, info));
 }
diff -ur libpeas-1.30.0/tests/libpeas/meson.build libpeas-1.30.0.new/tests/libpeas/meson.build
--- libpeas-1.30.0/tests/libpeas/meson.build	2021-03-19 21:24:38.805421600 -0300
+++ libpeas-1.30.0.new/tests/libpeas/meson.build	2021-06-30 15:17:31.160336493 -0300
@@ -8,8 +8,8 @@
 
 libpeas_tests_c_args = ['-UG_DISABLE_ASSERT', '-UG_DISABLE_CAST_CHECKS']
 
-if build_lua51_loader == true
-  libpeas_tests_sources += [['extension-lua', [lua51_dep, luajit_dep]]]
+if build_lua53_loader == true
+  libpeas_tests_sources += [['extension-lua', [lua53_dep, luajit_dep]]]
 endif
 
 if build_python3_loader == true
diff -ur libpeas-1.30.0/tests/libpeas/plugins/extension-lua/extension-lua53.gschema.xml libpeas-1.30.0.new/tests/libpeas/plugins/extension-lua/extension-lua53.gschema.xml
--- libpeas-1.30.0/tests/libpeas/plugins/extension-lua/extension-lua53.gschema.xml	2021-03-19 21:24:38.806421800 -0300
+++ libpeas-1.30.0.new/tests/libpeas/plugins/extension-lua/extension-lua53.gschema.xml	2021-06-30 15:21:12.575334005 -0300
@@ -1,5 +1,5 @@
 <schemalist>
-  <schema id="extension-lua51" path="/org/gnome/libpeas/tests/extension-lua51/">
+  <schema id="extension-lua53" path="/org/gnome/libpeas/tests/extension-lua53/">
     <key name="a-setting" type="s">
       <default>'Blah'</default>
       <summary>Just a setting.</summary>
diff -ur libpeas-1.30.0/tests/libpeas/plugins/extension-lua/extension-lua53.plugin libpeas-1.30.0.new/tests/libpeas/plugins/extension-lua/extension-lua53.plugin
--- libpeas-1.30.0/tests/libpeas/plugins/extension-lua/extension-lua53.plugin	2021-03-19 21:24:38.806421800 -0300
+++ libpeas-1.30.0.new/tests/libpeas/plugins/extension-lua/extension-lua53.plugin	2021-06-30 15:21:35.198333750 -0300
@@ -1,7 +1,7 @@
 [Plugin]
-Module=extension-lua51
-Loader=lua5.1
-Name=Extension lua5.1
-Description=This plugin is for the lua5.1 PeasExtension tests.
+Module=extension-lua53
+Loader=lua5.3
+Name=Extension lua5.3
+Description=This plugin is for the lua5.3 PeasExtension tests.
 Authors=Garrett Regier
 Copyright=Copyright © 2014 Garrett Regier
diff -ur libpeas-1.30.0/tests/libpeas/plugins/extension-lua/meson.build libpeas-1.30.0.new/tests/libpeas/plugins/extension-lua/meson.build
--- libpeas-1.30.0/tests/libpeas/plugins/extension-lua/meson.build	2021-03-19 21:24:38.806421800 -0300
+++ libpeas-1.30.0.new/tests/libpeas/plugins/extension-lua/meson.build	2021-06-30 15:22:18.678333262 -0300
@@ -1,9 +1,9 @@
 extension_lua_name = 'extension-lua'
 
 extension_lua_plugin_data = [
-  'extension-lua51.gschema.xml',
-  'extension-lua51.lua',
-  'extension-lua51.plugin',
+  'extension-lua53.gschema.xml',
+  'extension-lua53.lua',
+  'extension-lua53.plugin',
 ]
 
 custom_target(
diff -ur libpeas-1.30.0/tests/libpeas/plugins/extension-lua53-nonexistent.plugin libpeas-1.30.0.new/tests/libpeas/plugins/extension-lua53-nonexistent.plugin
--- libpeas-1.30.0/tests/libpeas/plugins/extension-lua53-nonexistent.plugin	2021-03-19 21:24:38.806421800 -0300
+++ libpeas-1.30.0.new/tests/libpeas/plugins/extension-lua53-nonexistent.plugin	2021-06-30 15:18:23.696335903 -0300
@@ -1,7 +1,7 @@
 [Plugin]
-Module=extension-lua51-nonexistent
-Loader=lua5.1
-Name=Extension lua5.1 Nonexistent
+Module=extension-lua53-nonexistent
+Loader=lua5.3
+Name=Extension lua5.3 Nonexistent
 Description=This plugin is nonexistent.
 Authors=Garrett Regier
 Copyright=Copyright © 2014 Garrett Regier
diff -ur libpeas-1.30.0/tests/libpeas/plugins/meson.build libpeas-1.30.0.new/tests/libpeas/plugins/meson.build
--- libpeas-1.30.0/tests/libpeas/plugins/meson.build	2021-03-19 21:24:38.806421800 -0300
+++ libpeas-1.30.0.new/tests/libpeas/plugins/meson.build	2021-06-30 15:18:45.968335652 -0300
@@ -1,6 +1,6 @@
 libpeas_plugins_data = [
   'extension-c-nonexistent.plugin',
-  'extension-lua51-nonexistent.plugin',
+  'extension-lua53-nonexistent.plugin',
   'extension-python-nonexistent.plugin',
   'extension-python3-nonexistent.plugin',
   'info-missing-module.plugin',
@@ -24,7 +24,7 @@
 subdir('embedded')
 subdir('extension-c')
 
-if build_lua51_loader == true
+if build_lua53_loader == true
   subdir('extension-lua')
 endif