From 276833851657c85651c053ee16b8e1a8dc768a50 Mon Sep 17 00:00:00 2001
From: Andrew Childs <andrew.childs@bibo.com.ph>
Date: Sun, 15 Nov 2020 19:12:56 +0900
Subject: [PATCH 2/2] Use pkg-config for libxml2

---
 configure.ac | 66 +++++++++-------------------------------------------
 1 file changed, 11 insertions(+), 55 deletions(-)

diff --git a/configure.ac b/configure.ac
index 358ab89..984a694 100644
--- a/configure.ac
+++ b/configure.ac
@@ -268,61 +268,17 @@ dnl Configure libxml2.
 dnl 
 LIBXML2_VERSION_MIN=2.6.11
 
-have_libxml2="1"
-
-AC_ARG_WITH([xml2-config], [  --with-xml2-config      libxml2 config program],
-if test "x${with_xml2_config}" = "xno" ; then
-  XML2_CONFIG=
-else
-  XML2_CONFIG="${with_xml2_config}"
-fi
-,
-  XML2_CONFIG=
-)
-if test "x${XML2_CONFIG}" != "x" ; then
-   if test ! -x "${XML2_CONFIG}" ; then
-     AC_MSG_ERROR([Unusable or missing xml2-config: ${XML2_CONFIG}])
-   fi
-else
-  AC_PATH_PROG([XML2_CONFIG], [xml2-config], , [${PATH}])
-  if test "x${XML2_CONFIG}" = "x" ; then
-    AC_MSG_ERROR([Cannot configure without xml2-config])
-  fi
-fi
-
-dnl Make sure the version of libxml2 found is sufficient.
-AC_MSG_CHECKING([for libxml >= ${LIBXML2_VERSION_MIN}])
-LIBXML2_FOUND=`2>&1 ${XML2_CONFIG} --version`
-LIBXML2_MAJOR=`echo ${LIBXML2_FOUND} | tr . " " | awk '{print $1}'`
-LIBXML2_MINOR=`echo ${LIBXML2_FOUND} | tr . " " | awk '{print $2}' | tr a-z " " |awk '{print $1}'`
-LIBXML2_BRANCH=`echo ${LIBXML2_FOUND} | tr . " " | awk '{print $3}' | tr a-z " " |awk '{print $1}'`
-if test "x${LIBXML2_BRANCH}" = "x" ; then
-  LIBXML2_BRANCH=0
-fi
-LIBXML2_MAJOR_MIN=`echo ${LIBXML2_VERSION_MIN} | tr . " " | awk '{print $1}'`
-LIBXML2_MINOR_MIN=`echo ${LIBXML2_VERSION_MIN} | tr . " " | awk '{print $2}'`
-LIBXML2_BRANCH_MIN=`echo ${LIBXML2_VERSION_MIN} | tr . " " | awk '{print $3}'`
-if test ${LIBXML2_MAJOR} -gt ${LIBXML2_MAJOR_MIN} \
-     -o ${LIBXML2_MAJOR} -eq ${LIBXML2_MAJOR_MIN} \
-     -a ${LIBXML2_MINOR} -gt ${LIBXML2_MINOR_MIN} \
-     -o ${LIBXML2_MAJOR} -eq ${LIBXML2_MAJOR_MIN} \
-     -a ${LIBXML2_MINOR} -eq ${LIBXML2_MINOR_MIN} \
-     -a ${LIBXML2_BRANCH} -ge $LIBXML2_BRANCH_MIN ; then
-  AC_MSG_RESULT([${LIBXML2_MAJOR}.${LIBXML2_MINOR}.${LIBXML2_BRANCH}])
-  have_libxml2="1"
-  CPPFLAGS="${CPPFLAGS} `${XML2_CONFIG} --cflags`"
-  LIBS="${LIBS} `${XML2_CONFIG} --libs`"
-else
-  AC_MSG_RESULT([no])
-  have_libxml2="0"
-fi
-if test "x${have_libxml2}" = "x1" ; then
-  dnl Final sanity check, to make sure that xmlwriter is present.
-  AC_CHECK_HEADER([libxml/xmlwriter.h], , [have_libxml2="0"])
-fi
-if test "x${have_libxml2}" = "x0" ; then
-  AC_MSG_ERROR([Cannot build without libxml2])
-fi
+PKG_PROG_PKG_CONFIG
+
+PKG_CHECK_MODULES(LIBXML2_PKGCONFIG, [libxml-2.0 >= ${LIBXML2_VERSION_MIN}],
+  [
+    have_libxml2=1
+    CPPFLAGS="${CPPFLAGS} ${LIBXML2_PKGCONFIG_CFLAGS}"
+    LIBS="${LIBS} ${LIBXML2_PKGCONFIG_LIBS}"
+  ],
+  [
+    have_libxml2=0
+  ])
 
 dnl 
 dnl Configure libcrypto (part of OpenSSL).
-- 
2.28.0