--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2009-12-24  Bruno Haible  <bruno@clisp.org>
+
+	Reduce namespace pollution on glibc systems.
+	* lib/inttypes.in.h: Don't include <stdint.h> on glibc systems.
+	* lib/stdlib.in.h: Don't include <stdint.h>, <unistd.h> on glibc
+	systems.
+	* lib/unistd.in.h: Don't include <stdio.h>, <fcntl.h>, <stdlib.h>,
+	<getopt.h> on glibc systems.
+	* lib/fcntl.in.h: Don't include <sys/stat.h>, <unistd.h> on glibc
+	systems.
+	* lib/fcntl.c: Include <unistd.h> here instead.
+
 2009-12-24  Bruno Haible  <bruno@clisp.org>
 
 	* lib/stdlib.in.h (includes): Fix typo in today's commit.

--- a/lib/fcntl.c
+++ b/lib/fcntl.c
@@ -25,6 +25,7 @@
 #include <errno.h>
 #include <limits.h>
 #include <stdarg.h>
+#include <unistd.h>
 
 #if !HAVE_FCNTL
 # define rpl_fcntl fcntl

--- a/lib/fcntl.in.h
+++ b/lib/fcntl.in.h
@@ -25,8 +25,10 @@
 /* Special invocation convention.  */
 
 #include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
+#ifndef __GLIBC__ /* Avoid namespace pollution on glibc systems.  */
+# include <sys/stat.h>
+# include <unistd.h>
+#endif
 #@INCLUDE_NEXT@ @NEXT_FCNTL_H@
 
 #else
@@ -35,8 +37,10 @@
 #ifndef _GL_FCNTL_H
 
 #include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
+#ifndef __GLIBC__ /* Avoid namespace pollution on glibc systems.  */
+# include <sys/stat.h>
+# include <unistd.h>
+#endif
 /* The include_next requires a split double-inclusion guard.  */
 #@INCLUDE_NEXT@ @NEXT_FCNTL_H@
 

--- a/lib/inttypes.in.h
+++ b/lib/inttypes.in.h
@@ -36,8 +36,11 @@
 #if ! defined INTTYPES_H && ! defined _GL_JUST_INCLUDE_SYSTEM_INTTYPES_H
 #define INTTYPES_H
 
-/* Include <stdint.h> or the gnulib replacement.  */
-#include <stdint.h>
+/* Include <stdint.h> or the gnulib replacement.
+   But avoid namespace pollution on glibc systems.  */
+#ifndef __GLIBC__
+# include <stdint.h>
+#endif
 /* Get CHAR_BIT.  */
 #include <limits.h>
 

--- a/lib/stdlib.in.h
+++ b/lib/stdlib.in.h
@@ -49,8 +49,8 @@
 # include <random.h>
 #endif
 
-#if (@GNULIB_RANDOM_R@ || !@HAVE_STRUCT_RANDOM_DATA@ \
-     || defined GNULIB_POSIXCHECK)
+#if !@HAVE_STRUCT_RANDOM_DATA@ || (@GNULIB_RANDOM_R@ && !@HAVE_RANDOM_R@) \
+    || defined GNULIB_POSIXCHECK
 # include <stdint.h>
 #endif
 
@@ -67,9 +67,10 @@
 };
 #endif
 
-#if @GNULIB_MKSTEMP@ || @GNULIB_GETSUBOPT@ || defined GNULIB_POSIXCHECK
+#if (@GNULIB_MKSTEMP@ || @GNULIB_GETSUBOPT@ || defined GNULIB_POSIXCHECK) && ! defined __GLIBC__
 /* On MacOS X 10.3, only <unistd.h> declares mkstemp.  */
 /* On Cygwin 1.7.1, only <unistd.h> declares getsubopt.  */
+/* But avoid namespace pollution on glibc systems.  */
 # include <unistd.h>
 #endif
 

--- a/lib/unistd.in.h
+++ b/lib/unistd.in.h
@@ -34,20 +34,26 @@
 
 /* mingw doesn't define the SEEK_* or *_FILENO macros in <unistd.h>.  */
 /* Cygwin 1.7.1 declares symlinkat in <stdio.h>, not in <unistd.h>.  */
+/* But avoid namespace pollution on glibc systems.  */
 #if (!(defined SEEK_CUR && defined SEEK_END && defined SEEK_SET) \
-     || @GNULIB_SYMLINKAT@ || defined GNULIB_POSIXCHECK)
+     || (@GNULIB_SYMLINKAT@ || defined GNULIB_POSIXCHECK)) \
+    && ! defined __GLIBC__
 # include <stdio.h>
 #endif
 
 /* Cygwin 1.7.1 declares unlinkat in <fcntl.h>, not in <unistd.h>.  */
-#if @GNULIB_UNLINKAT@ || defined GNULIB_POSIXCHECK
+/* But avoid namespace pollution on glibc systems.  */
+#if (@GNULIB_UNLINKAT@ || defined GNULIB_POSIXCHECK) && ! defined __GLIBC__
 # include <fcntl.h>
 #endif
 
 /* mingw fails to declare _exit in <unistd.h>.  */
 /* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>.  */
 /* Solaris declares getcwd not only in <unistd.h> but also in <stdlib.h>.  */
-#include <stdlib.h>
+/* But avoid namespace pollution on glibc systems.  */
+#ifndef __GLIBC__
+# include <stdlib.h>
+#endif
 
 /* mingw declares getcwd in <io.h>, not in <unistd.h>.  */
 #if ((@GNULIB_GETCWD@ || defined GNULIB_POSIXCHECK) \
@@ -63,8 +69,9 @@
 # include <sys/types.h>
 #endif
 
-/* Get getopt(), optarg, optind, opterr, optopt.  */
-#if @GNULIB_UNISTD_H_GETOPT@ && !defined _GL_SYSTEM_GETOPT
+/* Get getopt(), optarg, optind, opterr, optopt.
+   But avoid namespace pollution on glibc systems.  */
+#if @GNULIB_UNISTD_H_GETOPT@ && !defined __GLIBC__ && !defined _GL_SYSTEM_GETOPT
 # include <getopt.h>
 #endif