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Rémi Denis-Courmont authored
When the shell evaluates 'foo | bar', it returns the status of bar, not foo. 'foo' can fail silently: so long as 'bar' succeeds, make will not notice and will therefore not delete the target. So lets use 'tar cv(z|j|J)' instead of 'tar cv | (gzip|bzip2|xz)'.
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