--- qemu-1.7.0.org/linux-user/syscall.c
+++ qemu-1.7.0/linux-user/syscall.c
@@ -400,7 +400,7 @@
 #endif
 #define __NR_sys_ppoll __NR_ppoll
 _syscall5(int, sys_ppoll, struct pollfd *, fds, nfds_t, nfds,
-          struct timespec *, timeout, const __sigset_t *, sigmask,
+          struct timespec *, timeout, const sigset_t *, sigmask,
           size_t, sigsetsize)
 #endif