--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2011-07-31  Bruno Haible  <bruno@clisp.org>
+
+	strings: Add support for Minix.
+	* lib/strings.in.h [Minix]: Include <sys/types.h> before <strings.h>.
+	* m4/strings_h.m4 (gl_HEADER_STRINGS_H_BODY): Likewise.
+	* doc/posix-headers/strings.texi: Document the Minix problem.
+
 2011-07-31  Bruno Haible  <bruno@clisp.org>
 
 	wctype-h: Add support for Minix.

--- a/doc/posix-headers/strings.texi
+++ b/doc/posix-headers/strings.texi
@@ -7,6 +7,9 @@
 
 Portability problems fixed by Gnulib:
 @itemize
+@item
+This header file is not self-contained on some platforms:
+Minix 3.1.8.
 @end itemize
 
 Portability problems not fixed by Gnulib:

--- a/lib/strings.in.h
+++ b/lib/strings.in.h
@@ -23,6 +23,12 @@
 #endif
 @PRAGMA_COLUMNS@
 
+/* Minix 3.1.8 has a bug: <sys/types.h> must be included before <strings.h>.
+   But avoid namespace pollution on glibc systems.  */
+#if defined __minix && !defined __GLIBC__
+# include <sys/types.h>
+#endif
+
 /* The include_next requires a split double-inclusion guard.  */
 #@INCLUDE_NEXT@ @NEXT_STRINGS_H@
 

--- a/m4/strings_h.m4
+++ b/m4/strings_h.m4
@@ -1,5 +1,5 @@
 # Configure a replacement for <strings.h>.
-# serial 4
+# serial 5
 
 # Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -20,7 +20,11 @@
 
   dnl Check for declarations of anything we want to poison if the
   dnl corresponding gnulib module is not in use.
-  gl_WARN_ON_USE_PREPARE([[#include <strings.h>
+  gl_WARN_ON_USE_PREPARE([[
+    /* Minix 3.1.8 has a bug: <sys/types.h> must be included before
+       <strings.h>.  */
+    #include <sys/types.h>
+    #include <strings.h>
     ]], [ffs strcasecmp strncasecmp])
 ])