$NetBSD: patch-configure.ac,v 1.2 2023/09/29 18:29:29 nros Exp $

* Use newer autoconf macros

* set right version number

* add --enable-doc option
https://sourceforge.net/p/libpgf/patches/8/

--- configure.ac.orig	2021-02-12 19:54:36.000000000 +0000
+++ configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([libpgf], [7.15.32])
+AC_INIT([libpgf],[7.21.7])
 AC_CONFIG_SRCDIR([src/PGFimage.cpp])
 
 
@@ -27,22 +27,26 @@ PACKAGE_RELEASE=2
 AC_SUBST(PACKAGE_RELEASE)
 
 AM_INIT_AUTOMAKE
-AC_PROG_LIBTOOL
+LT_INIT
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS( [config.h] )
 AC_PROG_CXX
 
 dnl Check for doxygen support
+AC_ARG_ENABLE([doc],[AS_HELP_STRING([--enable-doc],[build docs])])
+if test $enable_doc; then
 AC_PATH_PROG([DOXYGEN], [doxygen])
 AC_PATH_PROG([DOT], [dot])
+fi
 AM_CONDITIONAL(HAS_DOXYGEN, test $DOXYGEN && $DOT)
 
 # Generate output
-AC_OUTPUT(Makefile
+AC_CONFIG_FILES([Makefile
     src/Makefile
     include/Makefile
     doc/Makefile
     doc/Doxyfile
     libpgf.spec
     libpgf.pc
-)
+])
+AC_OUTPUT