Currently localcharset uses m4/glibc21.m4 (ac_cv_gnu_library_2_1) to figure out if charset.alias needs to be installed or not.
However, a separate ac_cv_iconv_has_standard_charset_names or similar would be better so it can be controlled better. Especially important with musl c library, where charset.alias is not needed, but where we do not want to appear as GNU C library or uClibc. Additional confusion arises since: m4/glibc2.m4 (ac_cv_gnu_library_2) checks for glibc 2+ AND NOT uclibc m4/glibc21.m4 (ac_cv_gnu_library_2_1) checks for glibc 2.1+ OR uclibc While glibc21.m4 is used only for localcharset in gnulib, the same cache name value could be used for various other purposes in other projects. So please add separate separate config item for localcharset, even if it defaults to ac_cv_gnu_library_2_1. Thanks.
