Add ZMQ_PATH cmake variable for Windows.

CMakeLists.txt

@@ -15,6 +15,8 @@ set(LUA_NATIVE_OBJECTS_PATH ../LuaNativeObjects CACHE PATH
 				"Directory to LuaNativeObjects bindings generator.")
 set(USE_PRE_GENERATED_BINDINGS TRUE CACHE BOOL
 				"Set this to FALSE to re-generate bindings using LuaNativeObjects")
+set(ZMQ_PATH "" CACHE PATH
+				"Directory to libzmq. (by default use pkg-config to detect path)")
 
 set(COMMON_CFLAGS "${CFLAGS}")
 set(COMMON_LDFLAGS)
@@ -28,11 +30,25 @@ endif()
 set(COMMON_LIBS "${COMMON_LIBS};${LUA_LIBRARIES}")
 
 ## LibZMQ
-include(FindPkgConfig)
-pkg_search_module(ZMQ REQUIRED libzmq)
-set(COMMON_CFLAGS "${COMMON_CFLAGS} ${ZMQ_CFLAGS}")
-set(COMMON_LDFLAGS "${COMMON_LDFLAGS} ${ZMQ_LDFLAGS}")
-set(COMMON_LIBS "${COMMON_LIBS};${ZMQ_LIBRARIES}")
+if(WIN32)
+	## need ZMQ_PATH
+	if(IS_DIRECTORY "${ZMQ_PATH}")
+	else()
+		message(FATAL_ERROR "Please set the ZMQ_PATH CMake variable.")
+	endif()
+endif()
+if(IS_DIRECTORY ${ZMQ_PATH})
+	set(COMMON_CFLAGS "${COMMON_CFLAGS} -I${ZMQ_PATH}/include")
+	set(COMMON_LDFLAGS "${COMMON_LDFLAGS} -L${ZMQ_PATH}/lib")
+	set(COMMON_LIBS "${COMMON_LIBS};zmq")
+else()
+	## fallback to using pkg-config
+	include(FindPkgConfig)
+	pkg_search_module(ZMQ REQUIRED libzmq)
+	set(COMMON_CFLAGS "${COMMON_CFLAGS} ${ZMQ_CFLAGS}")
+	set(COMMON_LDFLAGS "${COMMON_LDFLAGS} ${ZMQ_LDFLAGS}")
+	set(COMMON_LIBS "${COMMON_LIBS};${ZMQ_LIBRARIES}")
+endif()
 
 ## LuaNativeObjects
 include(LuaNativeObjects)
@@ -63,6 +79,7 @@ add_library(lua-zmq MODULE ${LUA_ZMQ_SRC})
 target_link_libraries(lua-zmq ${COMMON_LIBS})
 set_target_properties(lua-zmq PROPERTIES PREFIX "")
 set_target_properties(lua-zmq PROPERTIES COMPILE_FLAGS "${COMMON_CFLAGS}")
+set_target_properties(lua-zmq PROPERTIES LINK_FLAGS "${COMMON_LDFLAGS}")
 set_target_properties(lua-zmq PROPERTIES OUTPUT_NAME zmq)
 
 install(TARGETS lua-zmq