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On macOS, wc -l always prepends the result with a tab, even when fed by stdin. But anyway, we should have used `grep -c -v`, which appears to be portable according to Autoconf's "Limitations of Usual Tools" section. Reported by Denis Excoffier. https://lists.gnu.org/r/bug-bison/2020-04/msg00009.html * tests/calc.at (_AT_CHECK_CALC): Use grep's -c instead.