From 8fc25247aaff633000bb151dc82ed5834f944522 Mon Sep 17 00:00:00 2001
From: Eric Hameleers <alien@slackware.com>
Date: Sun, 1 Oct 2017 11:17:41 +0200
Subject: iso2usb.sh: be gentle with old non-Slackware 32bit distros

---
 iso2usb.sh | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/iso2usb.sh b/iso2usb.sh
index dbf1a93..3f86775 100644
--- a/iso2usb.sh
+++ b/iso2usb.sh
@@ -632,8 +632,14 @@ if [ $REFRESH -eq 0 ]; then
   # features enabled by default.
   # Explicitly disable 64bit feature in the mke2fs command with '-O ^64bit';
   # otherwise, the syslinux bootloader (>= 6.03) will fail.
-  mkfs.ext4 -F -F -L "${LIVELABEL}" -m 0 -O ^64bit ${TARGET}3
-  tune2fs -c 0 -i 0 ${TARGET}3
+  # Note: older 32bit OS-es will trip over the '^64bit' feature so be gentle.
+  mkfs.ext4 -F -F -L "${LIVELABEL}" ${TARGET}3
+  if ! tune2fs -O '^64bit' ${TARGET}3 1>/dev/null 2>/dev/null ; then
+    FEAT_64BIT=""
+  else
+    FEAT_64BIT="-O '^64bit'"
+  fi
+  tune2fs -c 0 -i 0 -m 0 ${FEAT_64BIT} ${TARGET}3
 
 fi # End [ $REFRESH -eq 0 ]
 
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