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From: Sam James <sam@gentoo.org>
Date: Wed, 21 Apr 2021 06:20:13 +0100
Subject: Use more modern autoconf archive macro for readline
The previous macro used was pretty obsolete and certainly didn't work
on Gentoo Prefix on Darwin anyway.
--- a/configure.ac
+++ b/configure.ac
@@ -86,19 +86,9 @@ dnl ------------------
dnl readline detection
dnl ------------------
-abook_cv_readline=/usr
-AC_ARG_WITH(readline, [ --with-readline=DIR Where readline is installed ],
- [if test $withval != yes; then
- abook_cv_readline=$withval
- fi
- if test x$abook_cv_readline != x/usr; then
- LDFLAGS="-L${abook_cv_readline}/lib $LDFLAGS"
- CPPFLAGS="$CPPFLAGS -I${abook_cv_readline}/include"
- fi])
-
-AC_LIB_READLINE
-
-if test x$ac_cv_lib_readline = xno -o x$ac_cv_lib_readline_history = xno; then
+AX_LIB_READLINE
+
+if test x$ax_cv_lib_readline = xno -o x$ax_cv_lib_readline_history = xno; then
AC_MSG_ERROR([*** readline library not found or it doesn't support history ***])
fi
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