Fix build

nyalldawson · nyalldawson · commit d4a62b46633e · 2016-12-30T20:41:49.000+10:00
diff --git a/src/core/composer/qgsatlascomposition.h b/src/core/composer/qgsatlascomposition.h
@@ -19,6 +19,7 @@
 #include "qgsfeature.h"
 #include "qgsgeometry.h"
 #include "qgsrectangle.h"
+#include "qgsexpression.h"
 
 #include <memory>
 #include <QString>
