Public bug reported:

After upgrading 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.

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: libtool

** Tags added: libtool

** Description changed:

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

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https://bugs.launchpad.net/bugs/1579700

Title:
  libtool.m4 and ar conflict

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