Request c++14 mode from the compiler.

This is to avoid requesting older-than-default standard
version from modern compilers.


git-svn-id: https://svn.code.sf.net/p/extremetuxracer/code/trunk@687 0420edf4-82e4-42fc-9478-35b55e6d67a3

configure.ac

@@ -82,8 +82,8 @@ LIBS="$LIBS -lGLU"
 
 CPPFLAGS="${CPPFLAGS} -DETR_DATA_DIR=\\\"$datadir\\\""
 
-# Request c++11 compatibility
-CXXFLAGS="${CXXFLAGS} -std=c++11"
+# Request c++14 compatibility
+CXXFLAGS="${CXXFLAGS} -std=c++14"
 
 AC_CONFIG_FILES([
         Makefile