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-rw-r--r--internal/serial.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/internal/serial.h b/internal/serial.h
index 118848d..f97a8dc 100644
--- a/internal/serial.h
+++ b/internal/serial.h
@@ -9,6 +9,8 @@
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
*/
+#include "ruby/config.h" /* for HAVE_LONG_LONG */
+#include "ruby/defines.h" /* for LONG_LONG */
#ifndef HAVE_LONG_LONG
# error need C99+