test existence of xml2 library

makefile

@@ -47,12 +47,24 @@ ifneq (0, $(CPPUNIT_EXISTS))
 $(error You need cppunit installed)
 endif
-CPPUNIT_SO_TMP = $(shell ld --verbose | grep SEARCH | tr \  \\\n | sed s/SEARCH_DIR//g | sed s/\(\\\"//g | sed s/\\\"\)\\\;//g | sed s/^=//g | sort -u | sed \s/$$/\\/libcppunit.so/g\)
+CPPUNIT_SO_TMP = $(shell ld --verbose | grep SEARCH | tr \  \\\n | sed s/SEARCH_DIR//g | sed s/\(\\\"//g | sed s/\\\"\)\\\;//g | sed s/^=//g | sort -u | sed \s/$$/\\/libcppunit.so*/g\)
 CPPUNIT_SO_EXISTS = $(shell ls $(CPPUNIT_SO_TMP) 2>/dev/null | wc -l)
 ifeq (0, $(CPPUNIT_SO_EXISTS))
 $(error You need cppunit installed)
 endif
+LIBXML2_EXISTS = $(shell $(CXX) -c -o /dev/null -xc++ - <<< \\\#include\ \<libxml/xmlreader.h\> 2>/dev/null; echo $$?)
+ifneq (0, $(LIBXML2_EXISTS))
+$(error You need libxml2 installed)
+endif
+
+LIBXML2_SO_TMP = $(shell ld --verbose | grep SEARCH | tr \  \\\n | sed s/SEARCH_DIR//g | sed s/\(\\\"//g | sed s/\\\"\)\\\;//g | sed s/^=//g | sort -u | sed \s/$$/\\/libxml2.so*/g\)
+$(info $(LIBXML2_SO_TMP))
+LIBXML2_SO_EXISTS = $(shell ls $(LIBXML2_SO_TMP) 2>/dev/null | wc -l)
+ifeq (0, $(LIBXML2_SO_EXISTS))
+$(error You need libxml2 installed)
+endif
+
 SUBDIRS_WITH_MAKE = $(dir $(wildcard */makefile))