Index: cpudetect.c
===================================================================
--- cpudetect.c	(revision 36298)
+++ cpudetect.c	(revision 36300)
@@ -56,7 +56,7 @@
 #if CONFIG_RUNTIME_CPUDETECT
 /* I believe this code works.  However, it has only been used on a PII and PIII */
 
-#if defined(__linux__) && defined(_POSIX_SOURCE) && !ARCH_X86_64
+#if defined(__linux__) && !ARCH_X86_64
 static void sigill_handler_sse( int signal, struct sigcontext sc )
 {
    mp_msg(MSGT_CPUDETECT,MSGL_V, "SIGILL, " );
@@ -75,7 +75,7 @@
 
    gCpuCaps.hasSSE=0;
 }
-#endif /* __linux__ && _POSIX_SOURCE */
+#endif /* __linux__ */
 
 #if (defined(__MINGW32__) || defined(__CYGWIN__)) && !ARCH_X86_64
 LONG CALLBACK win32_sig_handler_sse(EXCEPTION_POINTERS* ep)
@@ -177,7 +177,6 @@
         mp_msg(MSGT_CPUDETECT,MSGL_V, gCpuCaps.hasSSE ? "yes.\n" : "no!\n" );
     }
 #elif defined(__linux__)
-#if defined(_POSIX_SOURCE)
     struct sigaction saved_sigill;
 
     /* Save the original signal handlers.
@@ -210,13 +209,6 @@
      */
     mp_msg(MSGT_CPUDETECT,MSGL_V, "Tests of OS support for SSE %s\n", gCpuCaps.hasSSE ? "passed." : "failed!" );
 #else
-    /* We can't use POSIX signal handling to test the availability of
-     * SSE, so we disable it by default.
-     */
-    mp_msg(MSGT_CPUDETECT,MSGL_WARN, "Cannot test OS support for SSE, disabling to be safe.\n" );
-    gCpuCaps.hasSSE=0;
-#endif /* _POSIX_SOURCE */
-#else
     /* Do nothing on other platforms for now.
      */
     mp_msg(MSGT_CPUDETECT,MSGL_WARN, "Cannot test OS support for SSE, leaving disabled.\n" );