configure: Make autoconf fail if libtool is not installed.
authorBen Pfaff <blp@nicira.com>
Tue, 31 Dec 2013 22:20:01 +0000 (14:20 -0800)
committerBen Pfaff <blp@nicira.com>
Fri, 10 Jan 2014 18:50:53 +0000 (10:50 -0800)
commit32015a3fd30162d92350c94e756a9fb9e39025ca
tree68762f25010c2ff4b32f0a6180a854f73f4b6c01
parentb49c106ef00438b1c59876dad90d00e8d6e7b627
configure: Make autoconf fail if libtool is not installed.

Otherwise users get an error later like:
    ./configure: line 5093: syntax error near unexpected token
    `disable-shared' ./configure: line 5093: `LT_INIT(disable-shared)'
It's probably friendlier to make configuration fail earlier.

Signed-off-by: Ben Pfaff <blp@nicira.com>
configure.ac