gtkmathview: fix build error

When building, I was seeing the following error which this patch fixes:

	../../../src/frontend/common/TemplateElementIterator.hh:46:18: error:
	'valid' was not declared in this scope, and no declarations were found by
	argument-dependent lookup at the point of instantiation [-fpermissive]

Upstream-Status: Submitted [padovani .at. di .dot. unito .dot. it]
Signed-off-by: Trevor Woerner <trevor.woerner@linaro.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/meta-oe/recipes-extended/mml-widget/gtkmathview/qualify-lookup.diff b/meta-oe/recipes-extended/mml-widget/gtkmathview/qualify-lookup.diff
new file mode 100644
index 000000000..1d4895045
--- /dev/null
+++ b/meta-oe/recipes-extended/mml-widget/gtkmathview/qualify-lookup.diff
@@ -0,0 +1,13 @@
+Index: gtkmathview-0.8.0/src/frontend/common/TemplateElementIterator.hh
+===================================================================
+--- gtkmathview-0.8.0.orig/src/frontend/common/TemplateElementIterator.hh
++++ gtkmathview-0.8.0/src/frontend/common/TemplateElementIterator.hh
+@@ -43,7 +43,7 @@ protected:
+   findValidNodeForward(const typename Model::Node& p0) const
+   {
+     for (typename Model::Node p = p0; p; p = Model::getNextSibling(p))
+-      if (valid(p)) return Model::asElement(p);
++      if (this->valid(p)) return Model::asElement(p);
+     return typename Model::Element();
+   }
+