Include windows.h for Sleep function

diff --git a/headless/load_session.cc b/headless/load_session.cc
index dc2644c4288567eb581a44bb022b04e414681f15..a9037214cc33f3fa6874e0c8f7f75ff024cbe7f4 100644 (file)
--- a/headless/load_session.cc
+++ b/headless/load_session.cc
@@ -17,6 +17,7 @@ using namespace ARDOUR;
 using namespace PBD;
 
 #ifdef PLATFORM_WINDOWS
+#include <windows.h>
 #define sleep(X) Sleep((X) * 1000)
 #endif