updated build system

project.cmake

@@ -1,17 +1,9 @@
 set(CMAKE_CXX_FLAGS "-include common.hpp ${CMAKE_CXX_FLAGS}")
 
-if (PROJECT_IS_DARWIN)
-  configure_file(
-    ${CMAKE_SOURCE_DIR}/${PROJECT_NAME}/Info.plist.in
-    ${CMAKE_SOURCE_DIR}/${PROJECT_NAME}/Info.plist
-    @ONLY
-  )
-endif()
-
 add_project_library(lib${PROJECT_NAME} "" "" "${PROJECT_ADDITIONAL_SOURCES}")
 
 add_project_executable(${PROJECT_NAME} lib${PROJECT_NAME} lib${PROJECT_NAME})
-if (PROJECT_IS_DARWIN)
+if (PROJECT_IS_DARWIN AND EXISTS "${CMAKE_SOURCE_DIR}/${PROJECT_NAME}/Info.plist")
   set_target_properties(${PROJECT_NAME} PROPERTIES
     MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_SOURCE_DIR}/${PROJECT_NAME}/Info.plist
   )