fix build if depenedencies are in distinct directories
diff --git a/configure.ac b/configure.ac
index 0b77531..018aa17 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,6 +18,7 @@
 PKG_CHECK_MODULES(OSMOCORE, libosmocore)
 PKG_CHECK_MODULES(OSMOGSM, libosmogsm)
 PKG_CHECK_MODULES(OSMOVTY, libosmovty)
+PKG_CHECK_MODULES(OSMONETIF, libosmo-netif)
 PKG_CHECK_MODULES(OSMOSIGTRAN, libosmo-sigtran)
 PKG_CHECK_MODULES(ASN1C, libasn1c)