And some SCFG goodness.

src/sbbs3/scfg/CMakeLists.txt

+project(SCFG C)
+
+cmake_minimum_required(VERSION 2.8.11)
+
+macro(double_require_lib_dir TARGET LIB LIBDIR)
+	if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_LIST_DIR}")
+		if(NOT DEFINED ${LIBDIR}_DONE)
+			add_subdirectory(../../${LIBDIR} ${LIB})
+			set(${LIBDIR}_DONE TRUE)
+		endif()
+	endif()
+	add_dependencies(${TARGET} ${LIB})
+	target_include_directories(${TARGET} PRIVATE ../../${LIBDIR})
+	target_compile_definitions(${TARGET} PRIVATE $<TARGET_PROPERTY:${LIB},INTERFACE_COMPILE_DEFINITIONS>)
+	target_link_libraries(${TARGET} ${LIB})
+endmacro()
+
+macro(double_require_lib TARGET LIB)
+	double_require_lib_dir(${TARGET} ${LIB} ${LIB})
+endmacro()
+
+add_executable(scfg
+	scfg.c
+	scfgxtrn.c
+	scfgmsg.c
+	scfgnet.c
+	scfgnode.c
+	scfgsub.c
+	scfgsys.c
+	scfgxfr1.c
+	scfgxfr2.c
+	scfgchat.c
+	../scfgsave.c
+	../scfglib1.c
+	../scfglib2.c
+	../load_cfg.c
+	../nopen.c
+	../dat_rec.c
+	../userdat.c
+	../date_str.c
+	../str_util.c
+)
+target_include_directories(scfg PRIVATE ..)
+double_require_lib(scfg xpdev)
+double_require_lib_dir(scfg ciolib conio)
+double_require_lib(scfg uifc)
+double_require_lib(scfg smblib)
+target_compile_definitions(scfg PRIVATE SCFG)
+
+add_executable(makehelp makehelp.c)
+double_require_lib(makehelp xpdev)