With GNU Make 4.0 on x86_64-unknown-linux-gnu I am unable to build
qemu 1.6.{0,1} because it fails with
AR libfdt/libfdt.a
ar: two different operation options specified
Makefile:234: recipe for target 'libfdt/libfdt.a' failed
If I try to build it with make V=1 the output shows it has
ARFLAGS=""
It builds if I export ARFLAGS="rv". If I have understood
the reply on the qemu-devel list correctly, qemu deliberately passes
empty ARFLAGS and relies on the following in 'info make' :
`ARFLAGS'
Flags to give the archive-maintaining program; default `rv'.
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