* 10.4 doesn't have posix spawn, but fortunately it's only used on ARM
  (iPhone), so we can still compile it

--- src/gdb/macosx/macosx-nat-inferior.c
+++ src/gdb/macosx/macosx-nat-inferior.c
@@ -58,7 +58,9 @@
 #include <sys/sysctl.h>
 #include <sys/proc.h>
 #include <mach/mach_error.h>
+#ifdef TARGET_ARM
 #include <spawn.h>
+#endif
 
 #include "macosx-nat-dyld.h"
 #include "macosx-nat-inferior.h"