Include <sys/ioctl.h>, to keep gcc -Wall happy.
diff --git a/Modules/fcntlmodule.c b/Modules/fcntlmodule.c
index d08123a..842e436 100644
--- a/Modules/fcntlmodule.c
+++ b/Modules/fcntlmodule.c
@@ -42,6 +42,7 @@
 #include <sys/file.h>
 #endif
 
+#include <sys/ioctl.h>
 #include <fcntl.h>