Comment 0 for bug 1579700

After updating from 14.04 to 16.04 I cannot compile bitcoin software. It seems autoreconf copies this file:

/usr/share/aclocal/libtool.m4

to generate local libtool executable. It sets ${AR_FLAGS=cru} inside libtool, but this setting does not work with ar that was supplied to me with 16.04 update. It seems ar was compiled with --enable-deterministic-archives option, which results in this error:

/usr/bin/ar: `u' modifier ignored since `D' is the default (see `U')

To fix this error one needs to set "Ucru" flags instead of "cru". But "cru" is set as system default for autoreconf for some reason.