Fix missing header for `pslot` lib

diff --git a/api/pslot.h b/api/pslot.h
index 80ca8a493b3a1e00b31c2d06178b73cd13baa070..7d2363f41fc19855d2efcbf05c2bee9bf8413fcf 100644 (file)
--- a/api/pslot.h
+++ b/api/pslot.h
@@ -1,6 +1,8 @@
 #ifndef PSLOT_H
 #define PSLOT_H
 
+#include <ostream>
+
 /*! \brief Parking slot basic class.
 
 This class contains some geometrical computations of parking slot. Parking slot