bump GCC requirement to version 6 or later

GCC 5 supports C++14, but it is still not enough because it does not implement
N4387 that was retroactively applied to the standard in 2015 (see the "Notes"
and "Defect reports" sections of
parent 1238fb20
Pipeline #707 failed with stages
in 68 minutes and 54 seconds
......@@ -60,7 +60,8 @@ have a 64-bit MATLAB; if it returns `PCWIN`, `MACI` or `GLNX`, then you have a
A number of tools and libraries are needed in order to recompile everything. You don't necessarily need to install everything, depending on what you want to compile.
- A POSIX compliant shell and an implementation of Make (mandatory)
- The [GNU Compiler Collection](, with gcc, g++ and gfortran (mandatory)
- The [GNU Compiler Collection](, version 6 or later, with
gcc, g++ and gfortran (mandatory)
- MATLAB (if you want to compile the MEX for MATLAB)
- [GNU Octave](, with the development headers (if you
want to compile the MEX for Octave)
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