[BUG] glibs tries to install bogus /usr/include/stdlib.h when "make check" is run twice

[Mike Frysinger]

On 14 Dec 2016 18:30, Florian Weimer wrote:
> Right.  In addition, we should guard against “make install” with
> DESTDIR="", so that developers do not corrupt their host system if the
> installed ld.so is incompatible with the new libc.so or vice versa.

make allows us to check whether DESTDIR is even defined, so we can
reject `make install` while still allowing `make install DESTDIR=`.

disallowing undefined DESTDIR sounds fine to me.
-mike
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