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12.5.3 AM_ICONV in `iconv.m4'

The AM_ICONV macro tests for the presence of the POSIX iconv function family in either the C library or a separate libiconv library. If found, it sets the am_cv_func_iconv variable to `yes'; it defines HAVE_ICONV to 1 in the autoconf generated configuration file (usually called `config.h'); it defines ICONV_CONST to `const' or to empty, depending on whether the second argument of iconv() is of type `const char **' or `char **'; it sets the variables LIBICONV and LTLIBICONV to the linker options for use in a Makefile (LIBICONV for use without libtool, LTLIBICONV for use with libtool); it adds an `-I' option to CPPFLAGS if necessary. If not found, it sets LIBICONV and LTLIBICONV to empty and doesn't change CPPFLAGS.

The complexities that AM_ICONV deals with are the following:

`iconv.m4' is distributed with the GNU gettext package because `gettext.m4' relies on it.

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