Altered the path for Cygwin to set the _ticksPerSecond to the correct value.

include/osg/Timer

@@ -138,10 +138,7 @@ class SG_EXPORT Timer {
 
     #include <sys/time.h>
 
-#  if defined(__ia64) || defined(__x86_64__)
-    #define CLK(x)        ((x)=0)
-
-#  elif defined(__powerpc)
+#  if defined(__powerpc)
 #    ifndef __HAVE_POWERPC_GET_TBL
 #      define __HAVE_POWERPC_GET_TBL 1
 static inline unsigned long get_tbl(void)

src/osg/Timer.cpp

@@ -44,7 +44,11 @@ const Timer* Timer::instance()
 
         if (_useStandardClock)
         {
+        #if defined(__CYGWIN__)
+            _secsPerTick = 1e-6; // gettimeofday()'s precision.
+        #else
             _secsPerTick = (1.0 / (double) CLOCKS_PER_SEC);
+        #endif
         }
         else
         {