Where can I get the file libintl.h to compile the project in C ++?

I use Code Blocks. When compiling a project from source (http://themanaworld.org/), an error occurs:

src\utils\gettext.h|29|error: libintl.h: No such file or directory 

The readme.txt says that you need to connect:

 * CMake >= 2.6 http://www.cmake.org/ * GNU gettext http://www.gnu.org/software/gettext/ * CVS http://www.nongnu.org/cvs/ (needed to run autopoint) 

Download GetText, but the problem is that there is no libintl.h file. Tell me where to get it?