change type of result variables to ssize_t

[libserialport.git] / libserialport_internal.h

diff --git a/libserialport_internal.h b/libserialport_internal.h
index ecf8fe95fa51ce4b7993df81d39f873538a5718e..f1d0d8505494c7949af7e60c98589c74309e0a49 100644 (file)
--- a/libserialport_internal.h
+++ b/libserialport_internal.h
@@ -93,6 +93,9 @@
 #include <IOKit/serial/ioss.h>
 #include <sys/syslimits.h>
 #include <mach/mach_time.h>
+#if MAC_OS_X_VERSION_MAX_ALLOWED < 120000 /* Before macOS 12 */
+#define kIOMainPortDefault kIOMasterPortDefault
+#endif
 #endif
 #ifdef __linux__
 #include <dirent.h>