CMake: test for the presence of Boost (Positioner)

owlps-positioner/CMakeLists.txt

@@ -1,4 +1,11 @@
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+# Make sure boost libraries are installed
+find_package(Boost 1.42.0 COMPONENTS program_options)
+if (NOT Boost_FOUND)
+  message(WARNING
+    "OwlPS Positioner dependency missing: Boost")
+  return()
+endif()
+include_directories(${Boost_INCLUDE_DIRS})
 
 set(EXTRA_LIBS ${EXTRA_LIBS} ${Boost_LIBRARIES} m)
 
@@ -9,6 +16,9 @@ if ("${GNU_SYSTEM}" OR ${CMAKE_SYSTEM_NAME} STREQUAL Linux)
   set(EXTRA_LIBS ${EXTRA_LIBS} rt)
 endif()
 
+# Enable C++11
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+
 set(OWLPS_POSITIONER_SRC_FILES
   src/accesspoint.cc
   src/accesspointsreadercsv.cc