(cmake) missing find_package(Threads) on UNIX

CMakeLists.txt

@@ -134,6 +134,11 @@ if (APPLE AND USE_TLS AND NOT USE_MBED_TLS)
   target_link_libraries(ixwebsocket "-framework foundation" "-framework security")
 endif()
 
+if (UNIX)
+  find_package(Threads)
+  target_link_libraries(ixwebsocket ${CMAKE_THREAD_LIBS_INIT})
+endif()
+
 if (USE_OPEN_SSL)
   find_package(OpenSSL REQUIRED)
   add_definitions(${OPENSSL_DEFINITIONS})

makefile

@@ -12,7 +12,7 @@ brew:
 	mkdir -p build && (cd build ; cmake -DUSE_TLS=1 -DUSE_WS=1 .. ; make -j install)
 
 ws:
-	mkdir -p build && (cd build ; cmake -DUSE_TLS=1 -DUSE_WS=1 -DUSE_MBED_TLS=1 .. ; make -j)
+	mkdir -p build && (cd build ; cmake -DUSE_TLS=1 -DUSE_WS=1 -DUSE_MBED_TLS=1 -DUSE_VENDORED_THIRD_PARTY=1 .. ; make -j)
 
 uninstall:
 	xargs rm -fv < build/install_manifest.txt