1 files changed, 9 insertions, 3 deletions
diff --git a/newlib/libc/syscalls/sysfcntl.c b/newlib/libc/syscalls/sysfcntl.c
index 23e1d837a..4d1c57cc1 100644
--- a/newlib/libc/syscalls/sysfcntl.c
+++ b/newlib/libc/syscalls/sysfcntl.c
@@ -2,6 +2,7 @@
 /* only called from stdio/fdopen.c, so arg can be int. */
 
 #include <reent.h>
+#include <errno.h>
 
 int
 fcntl (fd, flag, arg)
@@ -9,9 +10,14 @@ fcntl (fd, flag, arg)
      int flag;
      int arg;
 {
-#ifdef REENTRANT_SYSCALLS_PROVIDED
+#ifdef HAVE_FCNTL
+# ifdef REENTRANT_SYSCALLS_PROVIDED
   return _fcntl_r (_REENT, fd, flag, arg);
-#else
+# else
   return _fcntl (fd, flag, arg);
-#endif
+# endif
+#else /* !HAVE_FCNTL */
+  errno = ENOSYS;
+  return -1;
+#endif /& !HAVE_FCNTL */
 }