diff -ur a/setup/Linux/oss/build/install.sh b/setup/Linux/oss/build/install.sh
--- a/setup/Linux/oss/build/install.sh	2023-07-12 14:59:51.253990790 +0000
+++ b/setup/Linux/oss/build/install.sh	2023-07-12 14:56:33.394164100 +0000
@@ -198,7 +198,8 @@
 
 if ! test -d /lib/modules/$UNAME/kernel/oss
 then
-  mkdir /lib/modules/$UNAME/kernel/oss
+  # --parents option required if extramodules does not exist.
+  mkdir --parents /lib/modules/$UNAME/kernel/oss
 fi
 
 if ! test -d /lib/modules/$UNAME/kernel/oss
diff -ur a/setup/Linux/oss/scripts/restore_drv.sh b/setup/Linux/oss/scripts/restore_drv.sh
--- a/setup/Linux/oss/scripts/restore_drv.sh	2023-07-12 14:47:07.254120802 +0000
+++ b/setup/Linux/oss/scripts/restore_drv.sh	2023-07-12 18:05:30.938684489 +0000
@@ -9,6 +9,7 @@
 /usr/sbin/soundoff
 
 rm -rf /lib/modules/`uname -r`/kernel/oss
+[ $(ls -A /lib/modules/`uname -r`/extramodules) ] || rmdir /lib/modules/`uname -r`/extramodules
 
 if test -x /sbin/chkconfig 
 then /sbin/chkconfig oss off > /dev/null 2>&1