dfhack/plugins/labormanager/CMakeLists.txt

project(labormanager)
# A list of source files
set(PROJECT_SRCS
    labormanager.cpp
    joblabormapper.cpp
)
# A list of headers
set(PROJECT_HDRS
    labormanager.h
    joblabormapper.h
)
set_source_files_properties(${PROJECT_HDRS} PROPERTIES HEADER_FILE_ONLY TRUE)

# mash them together (headers are marked as headers and nothing will try to compile them)
list(APPEND PROJECT_SRCS ${PROJECT_HDRS})

dfhack_plugin(labormanager ${PROJECT_SRCS})