diff --git a/.gitmodules b/.gitmodules
index e69de29bb..41571085a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "subprojects/japan7-fonts"]
+	path = subprojects/japan7-fonts
+	url = https://github.com/odrling/japan7-fonts.git
diff --git a/meson.build b/meson.build
index fd558be4d..52c9fe7ad 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project('Aegisub', ['c', 'cpp'],
         license: 'BSD-3-Clause',
         meson_version: '>=0.56.0',
-        default_options: ['cpp_std=c++11', 'buildtype=debugoptimized'],
+        default_options: ['cpp_std=gnu++11', 'buildtype=debugoptimized'],
         version: '3.3.3')
 
 cmake = import('cmake')
diff --git a/subprojects/japan7-fonts b/subprojects/japan7-fonts
new file mode 160000
index 000000000..74ef0dea8
--- /dev/null
+++ b/subprojects/japan7-fonts
@@ -0,0 +1 @@
+Subproject commit 74ef0dea87e3c10bbf0b4df90b663b8868d9cbd5