C++ and ambiguous treatment of string literals

In my C++/Linux application I want to create a temp folder.

The code is very simple:

std::string tempFolder(mkdtemp("foo"));

To my surprise I received a warning message:

warning: ISO C++11 does not allow conversion from string literal to 'char *'

Ok, as I remember C++ treats string literals as std::string, not a char*. I also know that I can avoid this message by declaring char * as const char*. So my code might look like the following:

const char *tpl = "foo";
std::string tempFolder(mkdtemp(tpl));

if not for the fact that mkdtemp requires char * and not const char*. So explicit casting required here and now my code should look like that:

const char *tpl = "foo";
std::string tempFolder(mkdtemp(const_cast<char *>(tpl)));

In my opinion that looks absolutely ridiculous, the code looks absolutely incomprehensible and overloaded.

So my question - what am I doing wrong? Or maybe when and where C++ took a wrong turn? Where is the logical and understandable language that I once loved?