which doesn't want GNU-levels of automake strictness so tell it to be "foreign".
(From OE-Core rev:
5007bfcd6d21beb1e4da2ad1a1fe0dbd1f48a2db)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
--- /dev/null
+diff --git a/configure.ac b/configure.ac
+index d974461..a20dfa8 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -2,2 +2,3 @@ dnl Process this file with autoconf to produce a configure script.
+-AC_INIT(which.c)
+-AM_INIT_AUTOMAKE(which, 2.20)
++AC_INIT([which],[2.20])
++AC_CONFIG_SRCDIR(which.c)
++AM_INIT_AUTOMAKE([foreign])
EXTRA_OECONF = "--disable-iberty"
SRC_URI = "${GNU_MIRROR}/which/which-${PV}.tar.gz \
+ file://automake.patch \
file://remove-declaration.patch"
SRC_URI[md5sum] = "95be0501a466e515422cde4af46b2744"