configure.ac: Update minimum required autoconf version to 2.63

This is the autoconf version shipped in RHEL/CentOS 6.
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Amit D 2018-04-19 19:11:43 +03:00 committed by GitHub
parent 815bab66c5
commit 20254ae5b5
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@ -5,7 +5,7 @@
# ----------------------------------------
# Initialization
# ----------------------------------------
AC_PREREQ([2.59])
AC_PREREQ([2.63])
AC_INIT([tesseract],
[m4_esyscmd_s([test -d .git && git describe --abbrev=4 || cat VERSION])],
[https://github.com/tesseract-ocr/tesseract/issues],,