Fix 'directory does not exist' in windows tutorial

diff --git a/doc/tutorials/introduction/windows_install/windows_install.markdown b/doc/tutorials/introduction/windows_install/windows_install.markdown
index 0072c79..c24210b 100644 (file)
--- a/doc/tutorials/introduction/windows_install/windows_install.markdown
+++ b/doc/tutorials/introduction/windows_install/windows_install.markdown
@@ -50,6 +50,7 @@ if [  ! -d "$myRepo/opencv"  ]; then
     git clone https://github.com/opencv/opencv.git
     mkdir Build
     mkdir Build/opencv
+    mkdir Install
     mkdir Install/opencv
 else
     cd opencv