Build with libyang

Change-Id: Ib2f0b94c7782b9ab4b52fdc46376e1339ed456c8
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4ec7140..1ba791a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -51,6 +51,9 @@
 find_package(spdlog REQUIRED)
 find_package(Boost REQUIRED)
 
+find_package(PkgConfig)
+pkg_check_modules(LIBYANG REQUIRED libyang-cpp>=0.15.111)
+
 # we don't need filename tracking, and we prefer to use header-only Boost
 add_definitions(-DBOOST_SPIRIT_X3_NO_FILESYSTEM)