Makefile: SYSEXITS: use /dev/null directly instead of in a pipe
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							@ -18,7 +18,7 @@ PREFIX ?= /usr/local
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MANDIR != [ $(PREFIX) = / ] && printf '/usr/share/man\n' \
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					MANDIR != [ $(PREFIX) = / ] && printf '/usr/share/man\n' \
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	|| printf '/share/man\n'
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						|| printf '/share/man\n'
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SYSEXITS != </dev/null cpp -M -include sysexits.h - | tr ' ' '\n' \
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					SYSEXITS != cpp -M -include sysexits.h /dev/null | tr ' ' '\n' \
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	| sed -n 's/sysexits\.h//p' || printf 'include\n'
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						| sed -n 's/sysexits\.h//p' || printf 'include\n'
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CC ?= cc
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					CC ?= cc
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