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--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -53,7 +53,7 @@
# Try to respect $TMPDIR.
[ -"$TMPDIR"- = -""- ] &&
- export TMPDIR=/tmp/cabal-$(echo $(od -XN4 -An /dev/random)) && mkdir $TMPDIR
+ export TMPDIR=/tmp/cabal-$(echo $(od -tx2 -N4 -An /dev/random | tr -cd [0-9a-f])) && mkdir $TMPDIR
# Check for a C compiler, using user-set $CC, if any, first.
for c in $CC gcc clang cc icc; do
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