[LyX/master] Only gcc 4.8 is C++11 feature complete.

[Pavel Sanda]

commit 748bb5a046494f3e54da9a2388b931f0c2e2122b
Author: Pavel Sanda <sanda at lyx.org>
Date:   Thu Feb 20 09:15:31 2020 +0100

    Only gcc 4.8 is C++11 feature complete.
---
 INSTALL |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/INSTALL b/INSTALL
index 1525618..6229f6e 100644
--- a/INSTALL
+++ b/INSTALL
@@ -48,7 +48,7 @@ Requirements
 ------------
 
 First of all, you will need a C++11 standard conforming compiler, like gcc (at
-least 4.7) or clang.
+least 4.8) or clang.
 
 LyX makes great use of the C++ Standard Template Library (STL).
 This means that gcc users will have to install the relevant libstdc++