1 files changed, 2 insertions, 0 deletions
diff --git a/histfile.c b/histfile.c
index dea8972..6e13b84 100644
--- a/histfile.c
+++ b/histfile.c
@@ -26,6 +26,8 @@
 #define READLINE_LIBRARY
 
 #if defined (__TANDEM)
+#  define _XOPEN_SOURCE_EXTENDED 1
+#  include <unistd.h>
 #  include <floss.h>
 #endif