[PATCH] configure.ac: check for libnl-3 presence

[Daniel Mack <zonque gmail com>]

The versioning of libnl is an utter mess, and in some environment,
pkgconfig will fail to find headers and libraries due to newer .pc file
name confusion. Ship around this by checking for both libnl-1.pc and
libnl-3.0.pc.

Signed-off-by: Daniel Mack <zonque gmail com>
---
 configure.ac |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/configure.ac b/configure.ac
index 4e97904..106d221 100644
--- a/configure.ac
+++ b/configure.ac
@@ -312,7 +312,14 @@ else
 fi
 AC_DEFINE_UNQUOTED(NO_CONSOLEKIT, $no_ck, [Define to disable use of ConsoleKit])
 
-PKG_CHECK_MODULES(LIBNL, libnl-1 >= 1.0-pre8)
+has_libnl=no
+PKG_CHECK_MODULES(LIBNL, libnl-1 >= 1.0-pre8, has_libnl=yes, dummy=no)
+PKG_CHECK_MODULES(LIBNL, libnl-3.0, has_libnl=yes, dummy=no)
+
+if (test "${has_libnl}" = "no"); then
+	AC_MSG_ERROR(Netlink library is required)
+fi
+
 AC_SUBST(LIBNL_CFLAGS)
 AC_SUBST(LIBNL_LIBS)
 NM_LIBNL_CHECK
-- 
1.7.6