Rely on <unistd.h> to declare 'environ',

as gnulib does this if the system doesn't.
* lib-src/emacsclient.c (environ): Remove decl.
* src/callproc.c, src/editfns.c, src/process.c (environ) [!USE_CRT_DLL]:
* src/emacs.c (environ) [DOUG_LEA_MALLOC]:
* src/vm-limit.c (environ) [ORDINARY_LINK]: Remove decl.
* src/vm-limit.c: Include <unistd.h>, for 'environ'.

lib-src/ChangeLog

+2012-08-19  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Rely on <unistd.h> to declare 'environ'.
+	* emacsclient.c (environ): Remove decl.
+
 2012-08-17  Juanma Barranquero  <lekktu@gmail.com>
 
 	* makefile.w32-in ($(BLD)/regex.$(O)): Update dependencies.

lib-src/emacsclient.c

@@ -1584,11 +1584,6 @@ main (int argc, char **argv)
   /* Send over our environment and current directory. */
   if (!current_frame)
     {
-#ifndef WINDOWSNT
-      /* This is defined in stdlib.h on MS-Windows.  It's defined in
-	 unistd.h on some POSIX hosts, but not all (Bug#10155).  */
-      extern char **environ;
-#endif
       int i;
       for (i = 0; environ[i]; i++)
         {

src/ChangeLog

 2012-08-19  Paul Eggert  <eggert@cs.ucla.edu>
+	Rely on <unistd.h> to declare 'environ',
+	as gnulib does this if the system doesn't.
+	* callproc.c, editfns.c, process.c (environ) [!USE_CRT_DLL]:
+	* emacs.c (environ) [DOUG_LEA_MALLOC]:
+	* vm-limit.c (environ) [ORDINARY_LINK]: Remove decl.
+	* vm-limit.c: Include <unistd.h>, for 'environ'.
+
 	* unexaix.c, unexcoff.c: Include "mem-limits.h".
 	(start_of_data): Remove decl; mem-limits.h provides it.

src/callproc.c

@@ -65,10 +65,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "nsterm.h"
 #endif
 
-#ifndef USE_CRT_DLL
-extern char **environ;
-#endif
-
 #ifdef HAVE_SETPGID
 #if !defined (USG)
 #undef setpgrp

src/editfns.c

@@ -58,10 +58,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "window.h"
 #include "blockinput.h"
 
-#ifndef USE_CRT_DLL
-extern char **environ;
-#endif
-
 #define TM_YEAR_BASE 1900
 
 #ifdef WINDOWSNT

src/emacs.c

@@ -642,10 +642,6 @@ argmatch (char **argv, int argc, const char *sstr, const char *lstr,
 static void
 malloc_initialize_hook (void)
 {
-#ifndef USE_CRT_DLL
-  extern char **environ;
-#endif
-
   if (initialized)
     {
       if (!malloc_using_checking)

src/process.c

@@ -1623,9 +1623,6 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
   /* Use volatile to protect variables from being clobbered by longjmp.  */
   volatile int forkin, forkout;
   volatile int pty_flag = 0;
-#ifndef USE_CRT_DLL
-  extern char **environ;
-#endif
 
   inchannel = outchannel = -1;
 

src/vm-limit.c

@@ -18,6 +18,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 #include <setjmp.h>
+#include <unistd.h> /* for 'environ', on AIX */
 #include "lisp.h"
 #include "mem-limits.h"
 
@@ -268,7 +269,6 @@ start_of_data (void)
    * is known to live at or near the start of the system crt0.c, and
    * we don't sweat the handful of bytes that might lose.
    */
-  extern char **environ;
   return ((POINTER) &environ);
 #else
   extern int data_start;