OPM/opm-core — pull request #21 by Ivarun (2012-08-23 12:36:47+00:00)
Title: Make configure.ac compatible with automake 1.12

Since automake 1.12 warnings in the category 'extra-portability' are
enabled with -Wall [1]. In automake 1.11.2 the AM_PROG_AR macro was
added and is required when compiling with extra-compatibility [2].

Don't know if you like the explanatory comments in configure.ac or if it's too wordy?

[1] http://lists.gnu.org/archive/html/automake/2012-04/msg00060.html
[2] http://lists.gnu.org/archive/html/automake/2011-12/msg00055.html