See:

https://mail.gnome.org/archives/xml/2012-October/msg00038.html
https://mail.gnome.org/archives/xml/2012-October/msg00039.html

--- libxml2-2.9.0/configure.in	Mon Sep 10 20:52:46 2012
+++ libxml2-2.9.0/configure.in	Fri Oct 26 08:16:02 2012
@@ -82,7 +82,7 @@
   VERSION_SCRIPT_FLAGS=-Wl,--version-script=
 else
   case $host in
-  *-*-sunos*) VERSION_SCRIPT_FLAGS="-Wl,-M -Wl,";;
+  *-*-solaris*) VERSION_SCRIPT_FLAGS="-Wl,-M -Wl,";;
   esac
 fi
 AC_SUBST(VERSION_SCRIPT_FLAGS)
@@ -1149,7 +1153,7 @@
     TEST_SAX=SAXtests
 fi
 AC_SUBST(WITH_SAX1)
-AM_CONDITIONAL(WITH_SAX1_SOURCES, test "${WITH_TRIO}" = "1")
+AM_CONDITIONAL(WITH_SAX1_SOURCES, test "${WITH_SAX1}" = "1")
 AC_SUBST(TEST_SAX)
 
 if test "$with_push" = "no" ; then