POSIX clock_gettime() isn't available on Linux before 2.6, and the symbol may

 just be flat out missing from glibc, so force use of previous gettimeofday()
 behaviour for now.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401161

src/timer/linux/SDL_systimer.c

@@ -41,7 +41,13 @@ static char rcsid =
 */
 #if (defined _POSIX_TIMERS && _POSIX_TIMERS > 0)
 #include <time.h>
-#define USE_CLOCK_GETTIME
+/*
+ * clock_gettime() is missing in my system's glibc, and apparently isn't
+ *  available before Linux kernel 2.6...you can uncomment the following
+ *  define to use it, since it may be a better solution than
+ *  gettimeofday() on systems that support the newer syscall.  --ryan.
+ */
+/*#define USE_CLOCK_GETTIME*/
 #endif
 
 #include "SDL_error.h"