Fix compilation on OSX Sierra (10.12)

configure.ac

@@ -986,6 +986,7 @@ AC_CHECK_HEADERS(
         sys/mman.h \
         sys/param.h \
         sys/prctl.h \
+	sys/random.h \
         sys/resource.h \
         sys/select.h \
         sys/socket.h \

src/common/compat_pthreads.c

@@ -247,7 +247,7 @@ tor_cond_wait(tor_cond_t *cond, tor_mutex_t *mutex, const struct timeval *tv)
         return -1;
       }
       tvnow.tv_sec = ts.tv_sec;
-      tvnow.tv_usec = ts.tv_nsec / 1000;
+      tvnow.tv_usec = (int)(ts.tv_nsec / 1000);
       timeradd(tv, &tvnow, &tvsum);
 #else
       if (gettimeofday(&tvnow, NULL) < 0)

src/common/crypto.c

@@ -77,6 +77,9 @@
 #ifdef HAVE_SYS_SYSCALL_H
 #include <sys/syscall.h>
 #endif
+#ifdef HAVE_SYS_RANDOM_H
+#include <sys/random.h>
+#endif
 
 #include "torlog.h"
 #include "aes.h"