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Autoconf 2.59d (released in 2006) [1] started promoting several macros as not relevant for newer systems, including the `AC_C_CONST`. The `const` keyword is used in C since C89. On old systems some compilers lacked the `const` and this macro defined it to be empty. This check was relevant on systems with compilers before C89 and on current systems it can be omitted. [2] PHP also requires at least C89 so `const` is always available. Refs: [1] http://git.savannah.gnu.org/cgit/autoconf.git/tree/NEWS [2] https://www.gnu.org/software/autoconf/manual/autoconf-2.69/autoconf.html
This is libmbfl, a streamable multibyte character code filter and converter library. The original version of libmbfl is developed and distributed at https://github.com/moriyoshi/libmbfl under the LGPL 2.1 license. The libmbfl library is bundled with PHP as a fork of the original repository and is not in sync with the upstream at https://github.com/moriyoshi/libmbfl. As such, the libmbfl directory is directly modified in the php-src repository. See LICENSE and DISCLAIMER for licensing information.