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-rw-r--r--ext/readline/extconf.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/readline/extconf.rb b/ext/readline/extconf.rb
index 7db62745f3..431ed213bb 100644
--- a/ext/readline/extconf.rb
+++ b/ext/readline/extconf.rb
@@ -9,5 +9,8 @@ have_library("ncurses", "tgetnum") or
if have_header("readline/readline.h") and
have_header("readline/history.h") and
have_library("readline", "readline")
+ if have_func("rl_filename_completion_function")
+ $CFLAGS += "-DREADLINE_42_OR_LATER"
+ end
create_makefile("readline")
end