add back in MESSAGE package info in CMakeLists.txt

cmake/CMakeLists.txt

@@ -478,6 +478,32 @@ if(PKG_KIM)
   include_directories(${KIM_INCLUDE_DIRS})
 endif()
 
+if(PKG_MESSAGE)
+  option(MESSAGE_ZMQ "Use ZeroMQ in MESSAGE package" OFF)
+  file(GLOB_RECURSE cslib_SOURCES ${LAMMPS_LIB_SOURCE_DIR}/message/cslib/*.F
+      ${LAMMPS_LIB_SOURCE_DIR}/message/cslib/*.c ${LAMMPS_LIB_SOURCE_DIR}/message/cslib/*.cpp)
+  add_library(cslib STATIC ${cslib_SOURCES})
+
+  if(BUILD_MPI)
+    target_compile_definitions(cslib PRIVATE -DMPI_YES)
+  else()
+    target_compile_definitions(cslib PRIVATE -DMPI_NO)
+  endif()
+
+  if(MESSAGE_ZMQ)
+    target_compile_definitions(cslib PRIVATE -DZMQ_YES)
+    find_package(ZMQ REQUIRED)
+    target_include_directories(cslib PRIVATE ${ZMQ_INCLUDE_DIRS})
+    target_link_libraries(cslib PUBLIC ${ZMQ_LIBRARIES})
+  else()
+    target_compile_definitions(cslib PRIVATE -DZMQ_NO)
+    target_include_directories(cslib PRIVATE ${LAMMPS_SOURCE_DIR}/message/cslib/src/STUBS_ZMQ)
+  endif()
+
+  list(APPEND LAMMPS_LINK_LIBS cslib)
+  include_directories(${LAMMPS_LIB_SOURCE_DIR}/message/cslib/src)
+endif()
+
 if(PKG_MSCG)
   find_package(GSL REQUIRED)
   option(DOWNLOAD_MSCG "Download latte (instead of using the system's one)" OFF)