redisversioning: make ninja happy with generated version header file

CMakeLists.txt

@@ -216,20 +216,18 @@ else()
     VERBATIM)
 endif()
 
-
-include_directories(${CMAKE_BINARY_DIR}/include/)
-
 set(SOUPER_KVSTORE_FILES
   lib/KVStore/KVStore.cpp
   include/souper/KVStore/KVStore.h
 )
 
-# All those components requiring version information need to mention {VERSION_TMP} as their
-# dependent.
+add_custom_command(OUTPUT ${VERSION_FILE} DEPENDS ${VERSION_TMP})
+add_custom_target(genver_h DEPENDS ${VERSION_FILE})
+include_directories(${CMAKE_BINARY_DIR}/include/)
+
 add_library(souperKVStore STATIC
-  ${SOUPER_KVSTORE_FILES}
-  ${VERSION_TMP}
-)
+  ${SOUPER_KVSTORE_FILES})
+add_dependencies(souperKVStore genver_h)
 
 set(SOUPER_INFER_FILES
   lib/Infer/InstSynthesis.cpp