--- PKGBUILD.old	2021-09-28 22:59:09.934096537 +0100
+++ PKGBUILD	2021-09-28 22:59:01.984444199 +0100
@@ -86,6 +86,9 @@
   echo "Installing modules..."
   make INSTALL_MOD_PATH="$pkgdir/usr" INSTALL_MOD_STRIP=1 modules_install
 
+  # remove mutable modules.* files. which are regenerated by depmod
+  rm "$modulesdir"/modules.!(builtin|builtin.modinfo|order)
+
   # remove build and source links
   rm "$modulesdir"/{source,build}
 }