Use sysconfdir for the location of global tmux.conf (but default it to /etc),

based on changes from Dagobert Michelsen.

Makefile.am

@@ -15,7 +15,7 @@ dist-hook:
 	find $(distdir) -name .svn -type d|xargs rm -Rf
 
 # Preprocessor flags.
-CPPFLAGS += @XOPEN_DEFINES@
+CPPFLAGS += @XOPEN_DEFINES@ -DTMUX_CONF="\"$(sysconfdir)/tmux.conf\""
 
 # glibc as usual does things ass-backwards and hides useful things by default,
 # so everyone has to add this.
@@ -240,9 +240,10 @@ endif
 # Build tmux.1 in the right format.
 tmux.1: tmux.1.in
 	if test x@MANFORMAT@ = xmdoc; then \
-		cp tmux.1.in tmux.1; \
+		sed -e "s|@SYSCONFDIR@|$(sysconfdir)|g" tmux.1.in >tmux.1; \
 	else \
-		$(AWK) -fmdoc2man.awk <tmux.1.in >tmux.1; \
+		sed -e "s|@SYSCONFDIR@|$(sysconfdir)|g" tmux.1.in| \
+		$(AWK) -fmdoc2man.awk >tmux.1; \
 	fi
 
 # Update SF web site.

configure.ac

@@ -18,6 +18,9 @@ AC_PROG_CC
 AM_PROG_CC_C_O
 AC_PROG_INSTALL
 
+# Default tmux.conf goes in /etc not ${prefix}/etc.
+test "$sysconfdir" = '${prefix}/etc' && sysconfdir=/etc
+
 # Check for various headers. Alternatives included from compat.h.
 AC_CHECK_HEADERS(
 	[ \

server.c

@@ -170,13 +170,13 @@ server_start(int lockfd, char *lockfile)
 	cfg_references = 1;
 	ARRAY_INIT(&cfg_causes);
 
-	if (access(SYSTEM_CFG, R_OK) == 0) {
-		if (load_cfg(SYSTEM_CFG, cfg_cmd_q, &cause) == -1) {
-			xasprintf(&cause, "%s: %s", SYSTEM_CFG, cause);
+	if (access(TMUX_CONF, R_OK) == 0) {
+		if (load_cfg(TMUX_CONF, cfg_cmd_q, &cause) == -1) {
+			xasprintf(&cause, "%s: %s", TMUX_CONF, cause);
 			ARRAY_ADD(&cfg_causes, cause);
 		}
 	} else if (errno != ENOENT) {
-		xasprintf(&cause, "%s: %s", SYSTEM_CFG, strerror(errno));
+		xasprintf(&cause, "%s: %s", TMUX_CONF, strerror(errno));
 		ARRAY_ADD(&cfg_causes, cause);
 	}
 	if (cfg_file != NULL) {

tmux.1.in

@@ -122,7 +122,7 @@ Specify an alternative configuration file.
 By default,
 .Nm
 loads the system configuration file from
-.Pa /etc/tmux.conf ,
+.Pa @SYSCONFDIR@/tmux.conf ,
 if present, then looks for a user configuration file at
 .Pa ~/.tmux.conf .
 .Pp
@@ -3705,12 +3705,12 @@ was renamed to
 .Ar name .
 .El
 .Sh FILES
-.Bl -tag -width "/etc/tmux.confXXX" -compact
+.Bl -tag -width "@SYSCONFDIR@/tmux.confXXX" -compact
 .It Pa ~/.tmux.conf
 Default
 .Nm
 configuration file.
-.It Pa /etc/tmux.conf
+.It Pa @SYSCONFDIR@/tmux.conf
 System-wide configuration file.
 .El
 .Sh EXAMPLES

tmux.c

@@ -363,7 +363,7 @@ main(int argc, char **argv)
 			if (pw != NULL)
 				home = pw->pw_dir;
 		}
-		xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
+		xasprintf(&cfg_file, "%s/.tmux.conf", home);
 		if (access(cfg_file, R_OK) != 0 && errno == ENOENT) {
 			free(cfg_file);
 			cfg_file = NULL;

tmux.h

@@ -39,10 +39,6 @@
 extern char    *__progname;
 extern char   **environ;
 
-/* Default configuration files. */
-#define DEFAULT_CFG ".tmux.conf"
-#define SYSTEM_CFG "/etc/tmux.conf"
-
 /* Default prompt history length. */
 #define PROMPT_HISTORY 100