Building an R package in Windows - r

Question

I am trying to build an R package in Windows using Rtools v3.4 (latest)
I have developed a package with Rcpp and I have built it in an Ubuntu system successfully, but when I try to build it in my Windows 10 machine with the command
R CMD INSTALL --build --compile-both mypackage
I got the following error:
file1.hpp:25:18: required from here
C:/Rtools/mingw_32/i686-w64-mingw32/include/c++/ext/new_allocator.h:110:30: error: invalid conversion from 'const void*' to 'void*' [-fpermissive]
{ ::operator delete(__p); }
My Makefile.win file has this lines:
PKG_CPPFLAGS=-I./dep1/src -I./dep2/cudd -I./dep2/mtr -I./dep2/cplusplus -I./dep2/dddmp -I./dep2/util -I./dep2
CXX_STD=CXX11
PKG_LIBS=-llib1 -lm -fPIC -L./include/windows -llib2
What could be the reasson of that error?
Edit after #DirkEddelbuettel comment:
If add the -fpermissive flag I solve that issue, but a new error appears
R CMD INSTALL --build --compile-both -fpermissive mypackage
file1.hpp:95:71: required from here
C:/Rtools/mingw_32/i686-w64-mingw32/include/c++/bits/stl_construct.h:75:7: error: invalid static_cast from type 'const std::basic_string<char>*' to type 'void*'
{ ::new(static_cast<void*>(__p)) _T1(std::forward<_Args>(__args)...); }
The conflicting class has the following structure:
#ifndef __myKconf__configInfo__
#define __myKconf__configInfo__
#include <iostream>
#include <map>
#include <vector>
class myClass : public parentClass {
public :
myClass() {
...
}
//some public methods
void addToMenu(const std::string& s) {
contents.push_back(s);
}
private:
std::vector<const std::string> contents;
//more private elements
};
#endif

Answer 1

Very difficult to add to a constant string...
private:
std::vector<const std::string> contents;
//more private elements
Make it:
private:
std::vector<std::string> contents;
And you should be golden