Use pkgconfig to check builddeps

configure.in

@@ -63,6 +63,7 @@ AC_PROG_LN_S
 AC_LIBTOOL_WIN32_DLL
 AM_PROG_LIBTOOL
 AC_PROG_MAKE_SET
+PKG_PROG_PKG_CONFIG
 
 AC_MSG_CHECKING([for RM macro])
 _predefined_rm=`make -p -f /dev/null 2>/dev/null|grep '^RM ='|sed -e 's/^RM = //'`
@@ -170,24 +171,7 @@ AC_DEFINE_UNQUOTED(USE_ICONV,$use_iconv,[Use iconv.])
 #
 # Checks for FreeType
 #
-
+PKG_CHECK_MODULES(FREETYPE, freetype2)
-AC_ARG_WITH(freetype-config,
-	[AC_HELP_STRING([--with-freetype-config=PROG],
-			[Use FreeType configuration program PROG])],
-	freetype_config=$withval,
-	freetype_config=yes)
-
-if test "$freetype_config" = "yes"; then 
-	AC_PATH_PROG(ft_config,freetype-config,no)
-	if test "$ft_config" = "no"; then
-		AC_MSG_ERROR([You must have freetype installed; see http://www.freetype.org/])
-	fi
-else
-	ft_config="$freetype_config"
-fi
-
-FREETYPE_CFLAGS="`$ft_config --cflags`"
-FREETYPE_LIBS="`$ft_config --libs`"
 
 AC_SUBST(FREETYPE_LIBS)
 AC_SUBST(FREETYPE_CFLAGS)
@@ -210,134 +194,48 @@ LIBS="$fontconfig_save_libs"
 #
 # Check expat configuration
 #
-
-AC_ARG_WITH(expat,
-	[AC_HELP_STRING([--with-expat=DIR],
-			[Use Expat in DIR])],
-	expat=$withval, expat=yes)
-AC_ARG_WITH(expat-includes,
-	[AC_HELP_STRING([--with-expat-includes=DIR],
-			[Use Expat includes in DIR])],
-	expat_includes=$withval, expat_includes=yes)
-AC_ARG_WITH(expat-lib,
-	[AC_HELP_STRING([--with-expat-lib=DIR],
-			[Use Expat library in DIR])],
-	expat_lib=$withval, expat_lib=yes)
-
 if test "$enable_libxml2" != "yes"; then
-	case "$expat" in
+	# specify EXPAT_CFLAGS and/or EXPAT_LIBS if you like the old behavior
-	no)
+	# with --with-expat-includes and --with-expat-lib.
-	;;
+	PKG_CHECK_MODULES(EXPAT, expat)
-	*)
-		case "$expat_includes" in
-		yes)
-			case "$expat" in
-			yes)
-				;;
-			*)
-				EXPAT_CFLAGS="-I$expat/include"
-				;;
-			esac
-			;;
-		no)
-			EXPAT_CFLAGS=""
-			;;
-		*)
-			EXPAT_CFLAGS="-I$expat_includes"
-			;;
-		esac
-		case "$expat_lib" in
-		yes)
-			case "$expat" in
-			yes)
-				EXPAT_LIBS="-lexpat"
-				;;
-			*)
-				EXPAT_LIBS="-L$expat/lib -lexpat"
-				;;
-			esac
-			;;
-		no)
-			;;
-		*)
-			EXPAT_LIBS="-L$expat_lib -lexpat"
-			;;
-		esac
-
 	expatsaved_CPPFLAGS="$CPPFLAGS"
-		CPPFLAGS="$CPPFLAGS $EXPAT_CFLAGS"
 	expatsaved_LIBS="$LIBS"
+	CPPFLAGS="$CPPFLAGS $EXPAT_CFLAGS"
 	LIBS="$LIBS $EXPAT_LIBS"
 
 	AC_CHECK_HEADER(expat.h)
-		case "$ac_cv_header_expat_h" in
+	if test "$ac_cv_header_expat_h" = "no"; then
-		no)
 		AC_CHECK_HEADER(xmlparse.h)
-			case "$ac_cv_header_xmlparse_h" in
+		if test "$ac_cv_header_xmlparse_h" = "yes"; then
-			no)
-				have_expat_header=no;
-				;;
-			yes)
 			HAVE_XMLPARSE_H=1
 			AC_SUBST(HAVE_XMLPARSE_H)
 			AC_DEFINE_UNQUOTED(HAVE_XMLPARSE_H,$HAVE_XMLPARSE_H,
 				[Use xmlparse.h instead of expat.h])
-				have_expat_header=yes
+		else
-				;;
+			AC_MSG_ERROR([
-			esac
+*** expat is required. or try to use --enable-libxml2])
-			;;
+		fi
-		yes)
+	fi
-			have_expat_header=yes
-			;;
-		esac
-		case "$have_expat_header" in
-		no)
-			expat=no
-			;;
-		yes)
 	AC_CHECK_FUNCS(XML_SetDoctypeDeclHandler)
-			case "$ac_cv_func_XML_SetDoctypeDeclHandler" in
+	if test "$ac_cv_func_XML_SetDoctypeDeclHandler" = "no"; then
-			yes)
+		AC_MSG_ERROR([
-				HAVE_EXPAT=1
+*** expat is required. or try to use --enable-libxml2])
-				AC_SUBST(HAVE_EXPAT)
+	fi
-				AC_DEFINE_UNQUOTED(HAVE_EXPAT,$HAVE_EXPAT,
-				[Found a useable expat library])
-				;;
-			*)
-				expat=no
-				;;
-			esac
-			;;
-		esac
 	CPPFLAGS="$expatsaved_CPPFLAGS"
 	LIBS="$expatsaved_LIBS"
-		;;
-	esac
 
 	AC_SUBST(EXPAT_CFLAGS)
 	AC_SUBST(EXPAT_LIBS)
-
-	case "$expat" in
-	no)
-		EXPAT_CFLAGS=""
-		EXPAT_LIBS=""
-
-		AC_MSG_WARN([Cannot find usable expat library. Trying to use libxml2 as fallback.])
-		;;
-	esac
 fi
 
 #
 # Check libxml2 configuration
 #
-
 AC_ARG_ENABLE(libxml2,
 	[AC_HELP_STRING([--enable-libxml2],
 			[Use libxml2 instead of Expat])])
 
-PKG_PROG_PKG_CONFIG
+if test "$enable_libxml2" = "yes"; then
-
-if test "$enable_libxml2" = "yes" -o "$expat" = "no"; then
     PKG_CHECK_MODULES([LIBXML2], [libxml-2.0 >= 2.6])
     AC_DEFINE_UNQUOTED(ENABLE_LIBXML2,1,[Use libxml2 instead of Expat])