build on Mac OSX 10.9.4 : error: implicit instantiation of undefined template

[avilleret]

I got this when trying to build Gem version 0.93.git 50cc112 on Mac OSX 10.9.4 :

In file included from Properties.cpp:3:
In file included from ./Properties.h:25:
../../src/Utils/any.h:46:23: error: implicit instantiation of undefined template
      'std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >'
    const std::string from;
                      ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/iosfwd:188:33: note: template is declared here
    class _LIBCPP_TYPE_VIS_ONLY basic_string;
                                ^
In file included from Properties.cpp:3:
In file included from ./Properties.h:25:
../../src/Utils/any.h:47:23: error: implicit instantiation of undefined template
      'std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >'
    const std::string to;
                      ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/iosfwd:188:33: note: template is declared here
    class _LIBCPP_TYPE_VIS_ONLY basic_string;
                                ^
In file included from Properties.cpp:3:
In file included from ./Properties.h:25:
../../src/Utils/any.h:38:31: error: implicit instantiation of undefined template
      'std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >'
    virtual const std::string what(void) {
                              ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/iosfwd:188:33: note: template is declared here
    class _LIBCPP_TYPE_VIS_ONLY basic_string;
                                ^
In file included from Properties.cpp:3:
In file included from ./Properties.h:25:
../../src/Utils/any.h:39:28: error: implicit instantiation of undefined template
      'std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >'
      std::string result = std::string("bad cast(");
                           ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/iosfwd:188:33: note: template is declared here
    class _LIBCPP_TYPE_VIS_ONLY basic_string;
                                ^
In file included from Properties.cpp:3:
In file included from ./Properties.h:25:
../../src/Utils/any.h:39:19: error: implicit instantiation of undefined template
      'std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >'
      std::string result = std::string("bad cast(");
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/iosfwd:188:33: note: template is declared here
    class _LIBCPP_TYPE_VIS_ONLY basic_string;
                                ^
In file included from Properties.cpp:3:
In file included from ./Properties.h:25:
../../src/Utils/any.h:41:16: error: implicit instantiation of undefined template
      'std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >'
      result+= std::string("->");
               ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/iosfwd:188:33: note: template is declared here
    class _LIBCPP_TYPE_VIS_ONLY basic_string;
                                ^
In file included from Properties.cpp:3:
In file included from ./Properties.h:25:
../../src/Utils/any.h:43:16: error: implicit instantiation of undefined template
      'std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >'
      result+= std::string(")");
               ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/iosfwd:188:33: note: template is declared here
    class _LIBCPP_TYPE_VIS_ONLY basic_string;
                                ^
7 errors generated.

[avilleret]

shame on me, I was using the very old sourceforge repository

sorry for bothering...