Solaris 9 doesn't have setenv and unsetenv so add compat versions, based

on code from Dagobert Michelsen.

compat.h

@@ -1,4 +1,4 @@
-/* $Id: compat.h,v 1.20 2009-11-08 22:51:34 tcunha Exp $ */
+/* $Id: compat.h,v 1.21 2010-05-19 21:31:37 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -184,6 +184,12 @@ int	vasprintf(char **, const char *, va_list);
 char		*fgetln(FILE *, size_t *);
 #endif
 
+#ifndef HAVE_SETENV
+/* setenv.c */
+int		 setenv(char *, char *, int);
+int		 unsetenv(char *);
+#endif
+
 #ifndef HAVE_GETOPT
 /* getopt.c */
 extern int	BSDopterr;

compat/setenv.c

@@ -0,0 +1,49 @@
+/* $Id: setenv.c,v 1.1 2010-05-19 21:31:39 nicm Exp $ */
+
+/*
+ * Copyright (c) 2010 Dagobert Michelsen
+ * Copyright (c) 2010 Nicholas Marriott <nicm@users.sourceforge.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "tmux.h"
+
+int
+setenv(const char *name, const char *value, unused int overwrite)
+{
+	char	buf[1024];
+
+	snprintf(buf, sizeof(buf), "%s=%s", name, value);
+	return (putenv(buf));
+}
+
+int
+unsetenv(const char *name)
+{
+	char  **envptr;
+	int	namelen;
+
+	namelen = strlen(name);
+	for (envptr = environ; *envptr != NULL; envptr++) {
+		if (strncmp(name, *envptr, namelen) == 0 &&
+		    ((*envptr)[namelen] == '=' || (*envptr)[namelen] == '\0'))
+			break;
+	}
+	for (; *envptr != NULL; envptr++)
+		*envptr = *(envptr + 1);
+	return (0);
+}

configure

@@ -1,5 +1,5 @@
 #!/bin/sh
-# $Id: configure,v 1.50 2010-04-23 07:29:39 nicm Exp $
+# $Id: configure,v 1.51 2010-05-19 21:31:38 nicm Exp $
 #
 # Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 #
@@ -70,6 +70,7 @@ case $TMUX_PLATFORM in
 #define HAVE_PATHS_H
 #define HAVE_PROGNAME
 #define HAVE_QUEUE_H
+#define HAVE_SETENV
 #define HAVE_SETPROCTITLE
 #define HAVE_STRCASESTR
 #define HAVE_STRLCAT
@@ -98,6 +99,7 @@ EOF
 #define HAVE_PATHS_H
 #define HAVE_PROGNAME
 #define HAVE_PTY_H
+#define HAVE_SETENV
 #define HAVE_STRCASESTR
 #define HAVE_STRSEP
 #define HAVE_U_INT
@@ -122,6 +124,7 @@ EOF
 	cat <<EOF >>$CONFIG_H
 #define HAVE_BZERO
 #define HAVE_DAEMON
+#define HAVE_SETENV
 EOF
 	cat <<EOF >>$CONFIG_MK
 LIBS+= -lcurses -levent
@@ -158,13 +161,15 @@ SRCS+= osdep-sunos.c \
 	compat/fgetln.c \
 	compat/forkpty-sunos.c \
 	compat/getopt.c \
+	compat/setenv.c \
 	compat/strcasestr.c \
 	compat/strsep.c \
 	compat/strtonum.c \
 	compat/vis.c \
 	compat/unvis.c \
 	compat/imsg-buffer.c \
-	compat/imsg.c
+	compat/imsg.c \
+	compat/setenv.c
 EOF
 	;;
 # ------------------------------------------------------------------------------
@@ -181,6 +186,7 @@ EOF
 #define HAVE_GETOPT
 #define HAVE_PATHS_H
 #define HAVE_PROGNAME
+#define HAVE_SETENV
 #define HAVE_STRCASESTR
 #define HAVE_STRLCAT
 #define HAVE_STRLCPY
@@ -213,6 +219,7 @@ EOF
 #define HAVE_LIBUTIL_H
 #define HAVE_PATHS_H
 #define HAVE_PROGNAME
+#define HAVE_SETENV
 #define HAVE_SETPROCTITLE
 #define HAVE_STRCASESTR
 #define HAVE_STRLCAT
@@ -242,6 +249,7 @@ EOF
 #define HAVE_PATHS_H
 #define HAVE_PROGNAME
 #define HAVE_SETPROCTITLE
+#define HAVE_SETENV
 #define HAVE_STRCASESTR
 #define HAVE_STRLCAT
 #define HAVE_STRLCPY