commit 52ea36798268607f0cc1ed76d7289ca868132bf0
Author: Pavel Sanda <[email protected]>
Date:   Mon Sep 28 16:34:42 2020 +0200

    Qt4 compilable again
---
 src/frontends/qt4/GuiFontMetrics.cpp |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/src/frontends/qt4/GuiFontMetrics.cpp 
b/src/frontends/qt4/GuiFontMetrics.cpp
index 2e20a08..5bdbf18 100644
--- a/src/frontends/qt4/GuiFontMetrics.cpp
+++ b/src/frontends/qt4/GuiFontMetrics.cpp
@@ -28,7 +28,12 @@
 #include <QByteArray>
 #include <QRawFont>
 #include <QtEndian>
+
+#if QT_VERSION >= 0x050100
 #include <QtMath>
+#else
+#define qDegreesToRadians(degree) (degree * (M_PI / 180))
+#endif
 
 using namespace std;
 using namespace lyx::support;
@@ -110,7 +115,6 @@ inline QChar const ucs4_to_qchar(char_type const ucs4)
 }
 } // namespace
 
-
 GuiFontMetrics::GuiFontMetrics(QFont const & font)
        : font_(font), metrics_(font, 0),
          strwidth_cache_(cache_metrics_width_size),
-- 
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