Use a default path in exec*p*() if PATH is unset?

[Thomas Wolff]

Am 10.04.2017 um 22:29 schrieb Christian Franke:
> A few years after https://cygwin.com/ml/cygwin/2014-09/msg00204.html
> I found another use case of an unset PATH variable:
>
> The configure script from mandoc (http://mdocml.bsd.lv/) uses this 
> interesting approach to query default CC command from make:
>
> CC=`printf "all:\\n\\t@echo \\\$(CC)\\n" | env -i make -sf -`
Why does it `env -i` at all? (And why does it prepend a \ to the output?)
It seems this scriptlet has an issue, rather than adapting core 
behaviour for it.
Thomas

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