From 5501a81a31b22625867cee560f02aca080840473 Mon Sep 17 00:00:00 2001
From: Bob Burger <burgerrg@gmail.com>
Date: Wed, 13 Jun 2018 15:38:13 -0400
Subject: [PATCH] fix mats/foreign4.c compiler error when used in non-threaded
 systems

original commit: 778c79f6f6c4706b4072b46dc704712365421c16
---
 mats/foreign4.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mats/foreign4.c b/mats/foreign4.c
index 82bbc5aec3..d3e2441b85 100644
--- a/mats/foreign4.c
+++ b/mats/foreign4.c
@@ -105,6 +105,7 @@ void *in_thread(void *_proc_and_arg)
 # define os_thread_join(t) pthread_join(t, NULL)
 #endif
 
+#ifdef FEATURE_PTHREADS
 EXPORT double call_in_unknown_thread(double (*proc)(double arg), double arg, int n_times,
                                      int do_fork, int do_deactivate) {
   os_thread_t t;
@@ -131,7 +132,7 @@ EXPORT double call_in_unknown_thread(double (*proc)(double arg), double arg, int
 
   return arg;
 }
-
+#endif /* FEATURE_PTHREADS */
 #endif
 
 EXPORT unsigned spin_a_while(int amt, unsigned a, unsigned b)