fix warning about getcwd() on the Mac
diff --git a/src/packages/xdc/xs/xs.c b/src/packages/xdc/xs/xs.c
index 080a0cf..b40da94 100644
--- a/src/packages/xdc/xs/xs.c
+++ b/src/packages/xdc/xs/xs.c
@@ -104,7 +104,7 @@
 #define CALLBACK
 #endif
 
-#if defined(xdc_target__os_Linux)
+#if defined(xdc_target__os_Linux) || defined(xdc_target__os_MacOS)
 #include <unistd.h>
 #endif