add pthread library.

CMakeLists.txt

@@ -1,6 +1,7 @@
 cmake_minimum_required(VERSION 3.1)
 
 PROJECT(MULTIVERSO)
+FIND_PACKAGE(Threads REQUIRED)
 
 SET(THIRD_PARTY ${PROJECT_SOURCE_DIR}/third_party)
 SET(THIRD_PARTY_INC ${THIRD_PARTY}/include)

src/multiverso/CMakeLists.txt

@@ -10,6 +10,6 @@ LINK_DIRECTORIES(${THIRD_PARTY_LIB})
 
 ADD_LIBRARY(multiverso ${MULTIVERSO_SRC})
 
-TARGET_LINK_LIBRARIES(multiverso mpich mpl zmq)
+TARGET_LINK_LIBRARIES(multiverso mpich mpl zmq pthread)
 
-SET_PROPERTY(TARGET multiverso PROPERTY CXX_STANDARD 11)
+SET_PROPERTY(TARGET multiverso PROPERTY CXX_STANDARD 11)

src/multiverso_server/CMakeLists.txt

@@ -14,4 +14,4 @@ ADD_EXECUTABLE(multiverso.server ${MULTIVERSO_SERVER_SRC})
 
 TARGET_LINK_LIBRARIES(multiverso.server mpich mpl zmq multiverso)
 
-SET_PROPERTY(TARGET multiverso.server PROPERTY CXX_STANDARD 11)
+SET_PROPERTY(TARGET multiverso.server PROPERTY CXX_STANDARD 11)