ubox: CMake: fix json-c detection

Use PKG_SEARCH_MODULE() to detect json-c library,
otherwise the search fails, if both json-c and json
are not present in pkg-config database.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3522fe4..38709ec 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@ ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -g3 -Wmissing-declarations)
 OPTION(BUILD_LUA "build Lua plugin" ON)
 
 INCLUDE(FindPkgConfig)
-PKG_CHECK_MODULES(JSONC json-c)
+PKG_SEARCH_MODULE(JSONC json-c)
 IF(JSONC_FOUND)
   ADD_DEFINITIONS(-DJSONC)
   INCLUDE_DIRECTORIES(${JSONC_INCLUDE_DIRS})