@@ -, +, @@ 
 libmissing/m4/stdio_h.m4     | 4 ++--
 libmissing/m4/warn-on-use.m4 | 4 ++--
 libmissing/stdio.in.h        | 6 ++++--
 3 files changed, 8 insertions(+), 6 deletions(-)
--- a/libmissing/m4/stdio_h.m4	
+++ a/libmissing/m4/stdio_h.m4	
@@ -34,9 +34,9 @@ AC_DEFUN([gl_STDIO_H],
 
   dnl Check for declarations of anything we want to poison if the
   dnl corresponding gnulib module is not in use, and which is not
-  dnl guaranteed by C89.
+  dnl guaranteed by both C89 and C11.
   gl_WARN_ON_USE_PREPARE([[#include <stdio.h>
-    ]], [dprintf fpurge fseeko ftello getdelim getline popen renameat
+    ]], [dprintf fpurge fseeko ftello getdelim getline gets popen renameat
     snprintf vdprintf vsnprintf])
 ])
 
--- a/libmissing/m4/warn-on-use.m4	
+++ a/libmissing/m4/warn-on-use.m4	
@@ -18,8 +18,8 @@ dnl with or without modifications, as long as this notice is preserved.
 # some systems declare functions in the wrong header, then INCLUDES
 # should do likewise.
 #
-# If you assume C89, then it is generally safe to assume declarations
-# for functions declared in that standard (such as gets) without
+# It is generally safe to assume declarations for functions declared
+# in the intersection of C89 and C11 (such as printf) without
 # needing gl_WARN_ON_USE_PREPARE.
 AC_DEFUN([gl_WARN_ON_USE_PREPARE],
 [
--- a/libmissing/stdio.in.h	
+++ a/libmissing/stdio.in.h	
@@ -114,10 +114,12 @@ _GL_WARN_ON_USE (fflush, "fflush is not always POSIX compliant - "
 #endif
 
 /* It is very rare that the developer ever has full control of stdin,
-   so any use of gets warrants an unconditional warning.  Assume it is
-   always declared, since it is required by C89.  */
+   so any use of gets warrants an unconditional warning; besides, C11
+   removed it.  */
 #undef gets
+#if HAVE_RAW_DECL_GETS
 _GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
+#endif
 
 #if @GNULIB_FOPEN@
 # if @REPLACE_FOPEN@