( lib/gettext

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 13.4.13 `gettext.h' in `lib/'
 Internationalization of packages, as provided by GNU `gettext', is
 optional.  It can be turned off in two situations:
    * When the installer has specified `./configure --disable-nls'.  This
      can be useful when small binaries are more important than
      features, for example when building utilities for boot diskettes.
      It can also be useful in order to get some specific C compiler
      warnings about code quality with some older versions of GCC (older
      than 3.0).
    * When the package does not include the `intl/' subdirectory, and the
      libintl.h header (with its associated libintl library, if any) is
      not already installed on the system, it is preferable that the
      package builds without internationalization support, rather than
      to give a compilation error.
    A C preprocessor macro can be used to detect these two cases.
 Usually, when `libintl.h' was found and not explicitly disabled, the
 `ENABLE_NLS' macro will be defined to 1 in the autoconf generated
 configuration file (usually called `config.h').  In the two negative
 situations, however, this macro will not be defined, thus it will
 evaluate to 0 in C preprocessor expressions.
    `gettext.h' is a convenience header file for conditional use of
 `<libintl.h>', depending on the `ENABLE_NLS' macro.  If `ENABLE_NLS' is
 set, it includes `<libintl.h>'; otherwise it defines no-op substitutes
 for the libintl.h functions.  We recommend the use of `"gettext.h"'
 over direct use of `<libintl.h>', so that portability to older systems
 is guaranteed and installers can turn off internationalization if they
 want to.  In the C code, you will then write
      #include "gettext.h"
 instead of
      #include <libintl.h>
    The location of `gettext.h' is usually in a directory containing
 auxiliary include files.  In many GNU packages, there is a directory
 `lib/' containing helper functions; `gettext.h' fits there.  In other
 packages, it can go into the `src' directory.
    Do not install the `gettext.h' file in public locations.  Every
 package that needs it should contain a copy of it on its own.
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