Add #include for unistd.h on Linux.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296890 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Support/Unix/Threading.inc b/lib/Support/Unix/Threading.inc
index d697f5b62bc26806e811325c1d83f7054fb4a85e..232b1db6cdcda826ef689e42baeecf97f2d56941 100644 (file)
--- a/lib/Support/Unix/Threading.inc
+++ b/lib/Support/Unix/Threading.inc
@@ -30,6 +30,7 @@
 #endif
 
 #if defined(__linux__)
+#include <unistd.h>
 #include <sys/syscall.h>
 #endif