--- ./gegl/buffer/gegl-buffer.c~	2010-02-08 00:31:58.000000000 +0900
+++ ./gegl/buffer/gegl-buffer.c	2010-08-26 01:48:29.000000000 +0900
@@ -80,7 +80,8 @@
 /* #define GEGL_BUFFER_DEBUG_ALLOCATIONS to print allocation stack
  * traces for leaked GeglBuffers using GNU C libs backtrace_symbols()
  */
-#ifndef G_OS_WIN32
+#if defined(G_OS_WIN32) || __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_OS_X_VERSION_10_5
+#else
 #include <execinfo.h>
 #endif
 
@@ -876,7 +877,7 @@
 gegl_buffer_get_alloc_stack (void)
 {
   char  *result         = NULL;
-#ifdef G_OS_WIN32
+#if defined(G_OS_WIN32) || __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_OS_X_VERSION_10_5
   result = g_strdup ("backtrack not available on win32\n");
 #else
   void  *functions[MAX_N_FUNCTIONS];