diff --git a/www/Obsession/Portfile b/www/Obsession/Portfile
index 43e513e..e4f3975 100644
--- a/www/Obsession/Portfile
+++ b/www/Obsession/Portfile
@@ -28,7 +28,11 @@ if {${os.arch} eq "arm"} {
                     sha256  56932965a3ef04ee3dbfbb2eeeea6db68acc93f4f3260d3a3a8d1f5081e4c377 \
                     size    21656604
 
-    depends_build   port:qt4-mac
+    # https://github.com/tjohnman/Obsession/issues/54
+    pre-configure {
+        configure.args-append \
+                    QMAKE_CXXFLAGS=-std=c++11
+    }
 }
 
 categories          www hotline