Native Language Support (NLS)

Use --enable-nls to turn it on; see installation instructions for details.
See developer's guide how to make use of it in programs and how to add
translations.

psql sources have been almost fully prepared and an incomplete German
translation has been provided.  In the backend, only elog() calls are
currently translatable, and the provided German translation file is more
of a placeholder.

configure.in

@@ -212,6 +212,19 @@ AC_DEFINE([UNICODE_CONVERSION], 1,
           [Set to 1 if you want Unicode conversion support (--enable-unicode-conversion)])])
 AC_MSG_RESULT([$enable_unicode_conversion])
 
+#
+# NLS
+#
+AC_MSG_CHECKING([whether NLS is wanted])
+PGAC_ARG_OPTARG(enable, nls,
+                [  --enable-nls[=LANGUAGES]     enable Native Language Support],
+                [],
+                [WANTED_LANGUAGES=$enableval],
+                [AC_DEFINE(ENABLE_NLS)])
+AC_MSG_RESULT([$enable_nls])
+AC_SUBST(enable_nls)
+AC_SUBST(WANTED_LANGUAGES)
+
 #
 # Default port number (--with-pgport), default 5432
 #
@@ -720,6 +733,10 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_LIB(ssl,    [SSL_library_init], [], [AC_MSG_ERROR([library 'ssl' is required for OpenSSL])])
 fi
 
+if test "$enable_nls" = yes ; then
+  PGAC_CHECK_GETTEXT
+fi
+
 
 ##
 ## Header files