Use POSIX macros for linux

cde/lib/csa/agent.c

@@ -34,7 +34,7 @@
 #include <unistd.h>
 #include <signal.h>
 #include <rpc/rpc.h>
-#if !defined(linux) && !defined(CSRG_BASED)
+#if !defined(__linux__) && !defined(CSRG_BASED)
 # include <poll.h>
 #endif
 #if defined(SunOS)
@@ -200,7 +200,7 @@ _DtCm_destroy_agent()
 extern void
 _DtCm_process_updates()
 {
-#if defined(CSRG_BASED) || defined(linux) 
+#if defined(CSRG_BASED) || defined(__linux__)
         int     i, nfd;
         fd_set  rpc_bits;
 

cde/lib/csa/debug.c

@@ -33,11 +33,11 @@
 #define X_INCLUDE_TIME_H
 #define XOS_USE_NO_LOCKING
 
-#if defined(linux)
+#if defined(__linux__)
 #undef SVR4
 #endif
 #include <X11/Xos_r.h>
-#if defined(linux)
+#if defined(__linux__)
 #define SVR4
 #endif
 

cde/lib/csa/iso8601.c

@@ -174,7 +174,7 @@ _csa_tick_to_iso8601(time_t tick, char *buf_out)
 	}
 
 	/* JET.  This is horrible. */
-#if !defined(linux) && !defined(CSRG_BASED)
+#if !defined(__linux__) && !defined(CSRG_BASED)
 
 	if (getenv("TZ")) {
 		strncpy(tz_orig, getenv("TZ"), sizeof(tz_orig));

cde/lib/csa/lutil.c

@@ -42,15 +42,15 @@
 #endif
 #define X_INCLUDE_PWD_H
 #define XOS_USE_XT_LOCKING
-#if defined(linux)
+#if defined(__linux__)
 #undef SVR4
 #endif
 #include <X11/Xos_r.h>
-#if defined(linux)
+#if defined(__linux__)
 #define SVR4
 #endif
 
-#if !defined(linux)
+#if !defined(__linux__)
 extern char * strdup(const char *);
 #endif