--- ./src/ath.h.orig	2022-12-04 14:31:01.000000000 -0800
+++ ./src/ath.h	2022-12-04 14:34:35.000000000 -0800
@@ -24,6 +24,13 @@
 #ifdef HAVE_STDINT_H
 #include <stdint.h>
 #endif
+
+/* this addition is needed by Tiger, but not newer systems */
+/* cf libassuan port */
+#if (__APPLE__ && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1050)
+#include <sys/select.h>
+#endif
+
 #ifdef HAVE_W32_SYSTEM
   /* fixme: Check how we did it in libgcrypt.  */
   struct msghdr { int dummy; };