The environment variable TMPDIR is optional and not always set. We could
test for it and fall back to /tmp/ or just use the tool mktemp.

Signed-off-by: Henning Schild <[email protected]>
---
 scripts/prepare-kernel.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/scripts/prepare-kernel.sh b/scripts/prepare-kernel.sh
index 8e960e8..333d11c 100755
--- a/scripts/prepare-kernel.sh
+++ b/scripts/prepare-kernel.sh
@@ -238,9 +238,9 @@ fi
 # Create an empty output patch file, and initialize the temporary tree.
 if test "x$output_patch" != "x"; then
 
-    temp_tree=$TMPDIR/prepare-kernel-$$
-    if ! mkdir $temp_tree; then
-       echo Temporary directory $temp_tree already exists, aborting.
+    temp_tree=`mktemp -d prepare-kernel-XXX --tmpdir`
+    if [ $? -ne 0 ]; then
+       echo Temporary directory could not be created.
        exit 1
     fi
 
-- 
2.4.10


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