[LyX/2.2.x] Fix compilation with --disable-cxx11

[Guillaume Munch]

commit 2305fd838c33dc71a653ff9b53275a1a8124b821
Author: Guillaume Munch <g...@lyx.org>
Date:   Sun Jan 15 01:40:23 2017 +0100

    Fix compilation with --disable-cxx11
---
 src/frontends/qt4/GuiFontMetrics.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/frontends/qt4/GuiFontMetrics.h 
b/src/frontends/qt4/GuiFontMetrics.h
index 2b55d0e..438ebb4 100644
--- a/src/frontends/qt4/GuiFontMetrics.h
+++ b/src/frontends/qt4/GuiFontMetrics.h
@@ -106,7 +106,7 @@ private:
 
 #ifdef CACHE_METRICS_BREAKAT
        /// Cache for breakAt
-       mutable QCache<docstring, std::pair<int, int>> breakat_cache_;
+       mutable QCache<docstring, std::pair<int, int> > breakat_cache_;
 #endif
 
 #ifdef CACHE_METRICS_QTEXTLAYOUT