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Autoconf 2.59d (released in 2006) 1 started promoting several macros as not relevant for newer systems anymore, including the AC_FUNC_VPRINTF. This macro checks for presence of the vprint function otherwise checks for presence of the _doprnt function. This check was relevant on very old systems and today can be omitted since it should be well supported by now. [2] Also PHP doesn't use the HAVE_VPRINTF or HAVE_DOPRNT symbols. 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