diff --git a/supp.c b/supp.c
index ef9a62a..e942d64 100644
--- a/supp.c
+++ b/supp.c
@@ -116,9 +116,13 @@ extern int tgetnum P((const char *));
 
 #ifdef MORE_TERMINFO
 
+#ifdef PLAIN_CURSES
+#include <curses.h>
+#else
 #include <cursesX.h>
+#endif
 #include <term.h>
-extern void setupterm P((const char *, int, int));
+extern int setupterm P((const char *, int, int *));
 
 #else /* ! MORE_TERMINFO */