#1809 include unistd.h required for usleep

diff --git a/modules/highgui/src/window_QT.cpp b/modules/highgui/src/window_QT.cpp
index d0eb08d..30bf973 100755 (executable)
--- a/modules/highgui/src/window_QT.cpp
+++ b/modules/highgui/src/window_QT.cpp
@@ -49,6 +49,8 @@
 \r
 #ifdef _WIN32\r
 #include <windows.h>\r
+#else\r
+#include <unistd.h>\r
 #endif\r
 \r
 #ifdef HAVE_QT_OPENGL\r