--- a/m4/objc.m4.old
+++ b/m4/objc.m4
@@ -448,32 +448,32 @@
 
 # AC_LANG_SOURCE(Objective C)(BODY)
 # ---------------------------------
-m4_copy([AC_LANG_SOURCE(C)], [AC_LANG_SOURCE(Objective C)])
+m4_copy_force([AC_LANG_SOURCE(C)], [AC_LANG_SOURCE(Objective C)])
 
 
 # AC_LANG_PROGRAM(Objective C)([PROLOGUE], [BODY])
 # ------------------------------------------------
-m4_copy([AC_LANG_PROGRAM(C)], [AC_LANG_PROGRAM(Objective C)])
+m4_copy_force([AC_LANG_PROGRAM(C)], [AC_LANG_PROGRAM(Objective C)])
 
 
 # AC_LANG_CALL(Objective C)(PROLOGUE, FUNCTION)
 # ---------------------------------------------
-m4_copy([AC_LANG_CALL(C)], [AC_LANG_CALL(Objective C)])
+m4_copy_force([AC_LANG_CALL(C)], [AC_LANG_CALL(Objective C)])
 
 
 # AC_LANG_FUNC_LINK_TRY(Objective C)(FUNCTION)
 # --------------------------------------------
-m4_copy([AC_LANG_FUNC_LINK_TRY(C)], [AC_LANG_FUNC_LINK_TRY(Objective C)])
+m4_copy_force([AC_LANG_FUNC_LINK_TRY(C)], [AC_LANG_FUNC_LINK_TRY(Objective C)])
 
 
 # AC_LANG_BOOL_COMPILE_TRY(Objective C)(PROLOGUE, EXPRESSION)
 # -----------------------------------------------------------
-m4_copy([AC_LANG_BOOL_COMPILE_TRY(C)], [AC_LANG_BOOL_COMPILE_TRY(Objective C)])
+m4_copy_force([AC_LANG_BOOL_COMPILE_TRY(C)], [AC_LANG_BOOL_COMPILE_TRY(Objective C)])
 
 
 # AC_LANG_INT_SAVE(Objective C)(PROLOGUE, EXPRESSION)
 # ---------------------------------------------------
-m4_copy([AC_LANG_INT_SAVE(C)], [AC_LANG_INT_SAVE(Objective C)])
+m4_copy_force([AC_LANG_INT_SAVE(C)], [AC_LANG_INT_SAVE(Objective C)])