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GNU Patch < 2.6.1 has a race condition so we create a per-instance TMPDIR to avoid this. This was implemented by setting os.environ[TMPDIR] but at the end of do_patch the temporary directory is deleted but TMPDIR is not unset. In general this doesn't cause a problem but if do_patch is embedded in a larger function then TMPDIR is set to a directory that doesn't exist. Avoid this by removing TMPDIR from os.environ when the directory is deleted. (From OE-Core rev: 51ea4378864f1468df2ca282a84f78a17d6861aa) Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>