add #include that had gone unnoticed before

diff --git a/libs/canvas/canvas/utils.h b/libs/canvas/canvas/utils.h
index 947e57cc7c1a5e2412ab7db6a7a33d42b343ea25..95228999137441d8d07ce8fa5148ceed43a0d286 100644 (file)
--- a/libs/canvas/canvas/utils.h
+++ b/libs/canvas/canvas/utils.h
@@ -17,6 +17,8 @@
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include <cairomm/context.h>
+
 #include "canvas/visibility.h"
 #include "canvas/types.h"