Add --with-libxslt configure option

configure.in

 dnl Process this file with autoconf to produce a configure script.
-dnl $PostgreSQL: pgsql/configure.in,v 1.510 2007/04/13 18:50:01 adunstan Exp $
+dnl $PostgreSQL: pgsql/configure.in,v 1.511 2007/04/15 12:48:23 adunstan Exp $
 dnl
 dnl Developers, please strive to achieve this order:
 dnl
@@ -579,6 +579,15 @@ fi
 
 AC_SUBST(with_libxml)
 
+#
+# XSLT
+#
+PGAC_ARG_BOOL(with, libxslt, no, [  --with-libxslt           build with XSLT support],
+              [AC_DEFINE([USE_LIBXSLT], 1, [Define to 1 to build with XSLT support. (--with-libxslt)])])
+
+
+AC_SUBST(with_libxslt)
+
 #
 # Zlib
 #
@@ -768,6 +777,10 @@ if test "$with_libxml" = yes ; then
   AC_CHECK_LIB(xml2, xmlSaveToBuffer, [], [AC_MSG_ERROR([library 'xml2' (version >= 2.6.23) is required for XML support])])
 fi
 
+if test "$with_libxslt" = yes ; then
+  AC_CHECK_LIB(xslt, xsltLibxmlVersion, [], [AC_MSG_ERROR([library 'xslt' is required for XSLT support])])
+fi
+
 
 ##
 ## Header files
@@ -847,6 +860,10 @@ if test "$with_libxml" = yes ; then
   AC_CHECK_HEADER(libxml/parser.h, [], [AC_MSG_ERROR([header file <libxml/parser.h> is required for XML support])])
 fi
 
+if test "$with_libxslt" = yes ; then
+  AC_CHECK_HEADER(libxslt/xslt.h, [], [AC_MSG_ERROR([header file <libxslt/xslt.h> is required for XSLT support])])
+fi
+
 if test "$with_ldap" = yes ; then
   if test "$PORTNAME" != "win32"; then
      AC_CHECK_HEADERS(ldap.h, [],

contrib/Makefile

-# $PostgreSQL: pgsql/contrib/Makefile,v 1.73 2007/04/14 12:57:07 adunstan Exp $
+# $PostgreSQL: pgsql/contrib/Makefile,v 1.74 2007/04/15 12:48:23 adunstan Exp $
 
 subdir = contrib
 top_builddir = ..
@@ -37,9 +37,15 @@ ifeq ($(with_openssl),yes)
 WANTED_DIRS += sslinfo
 endif
 
+ifeq ($(with_libxml),yes)
+ifeq ($(with_libxslt),yes)
+WANTED_DIRS += xml2
+endif
+endif
+
 # Missing:
 #		start-scripts	\ (does not have a makefile)
-#		xml2		\ (requires libxml and libxslt installed)
+
 
 all install installdirs uninstall distprep clean distclean maintainer-clean:
 	@for dir in $(WANTED_DIRS); do \

src/Makefile.global.in

 # -*-makefile-*-
-# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.234 2007/04/13 18:50:01 adunstan Exp $
+# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.235 2007/04/15 12:48:23 adunstan Exp $
 
 #------------------------------------------------------------------------------
 # All PostgreSQL makefiles include this file and use the variables it sets,
@@ -153,6 +153,7 @@ with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
 with_libxml	= @with_libxml@
+with_libxslt	= @with_libxslt@
 with_zlib	= @with_zlib@
 enable_shared	= @enable_shared@
 enable_rpath	= @enable_rpath@

src/include/pg_config.h.in

@@ -256,6 +256,9 @@
 /* Define to 1 if you have the `xml2' library (-lxml2). */
 #undef HAVE_LIBXML2
 
+/* Define to 1 if you have the `xslt' library (-lxslt). */
+#undef HAVE_LIBXSLT
+
 /* Define to 1 if you have the `z' library (-lz). */
 #undef HAVE_LIBZ