From 1a8facffacb3203a5d4344a40fb9f0a57239f87d Mon Sep 17 00:00:00 2001
From: Vitor Santos Costa <vsc@dcc.fc.up.pt>
Date: Tue, 5 Nov 2013 17:12:31 +0000
Subject: [PATCH] fix compilation without threads, thanks Andrea

---
 C/pl-yap.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/C/pl-yap.c b/C/pl-yap.c
index 69f18ba06..89dfcc947 100755
--- a/C/pl-yap.c
+++ b/C/pl-yap.c
@@ -1299,10 +1299,13 @@ sysError(const char *fm, ...)
 
 int
 raiseSignal(PL_local_data_t *ld, int sig)
-{ if (sig == SIG_THREAD_SIGNAL) {
+{
+#if THREADS
+ if (sig == SIG_THREAD_SIGNAL) {
      Yap_signal(YAP_ITI_SIGNAL);
      return TRUE;    
   }
+#endif
   fprintf(stderr, "Unsupported signal %d\n", sig);
   return FALSE;
 }