I have the following error : change compiler CXX = $(BINPREF)g++ -std=gnu++11 $(M_ARCH) to
CXX = $(BINPREF)g++ -std=gnu++17 $(M_ARCH).

Message:
g++ -Iinclude -O2 -fPIC -std=c++17 -Wall -c -o obj/dic/variable_descriptor.o src/dic/variable_descriptor.cpp
src/dic/variable_descriptor.cpp: In static member function 'static std::optionalRedatam::VariableDescriptor::Declaration Redatam::VariableDescriptor::Declaration::fromDeclarationString(const string&)':
src/dic/variable_descriptor.cpp:22:69: error: no matching function for call to 'replace(std::__cxx11::basic_string::iterator, std::__cxx11::basic_string::iterator, char, const value_type&)'
std::replace(begin(p), end(p), '\', fs::path::preferred_separator);
^
In file included from C:/rtools40/mingw64/include/c++/8.3.0/algorithm:62,
from C:/rtools40/mingw64/include/c++/8.3.0/regex:38,
from src/dic/variable_descriptor.cpp:3:
C:/rtools40/mingw64/include/c++/8.3.0/bits/stl_algo.h:4362:5: note: candidate: 'template<class _FIter, class _Tp> void std::replace(_FIter, _FIter, const _Tp&, const _Tp&)'
replace(_ForwardIterator __first, _ForwardIterator __last,
^~~~~~~
C:/rtools40/mingw64/include/c++/8.3.0/bits/stl_algo.h:4362:5: note: template argument deduction/substitution failed:
src/dic/variable_descriptor.cpp:22:69: note: deduced conflicting types for parameter 'const _Tp' ('char' and 'std::experimental::filesystem::v1::__cxx11::path::value_type' {aka 'wchar_t'})
std::replace(begin(p), end(p), '\', fs::path::preferred_separator);
^
make: *** [Makefile:27: obj/dic/variable_descriptor.o] Error 1