We always have libxml installed.

lib/glibtop-backend-info.c

@@ -32,8 +32,6 @@
 static GHashTable *_glibtop_backend_list = NULL;
 static long _glibtop_backend_nr = 0;
 
-#if HAVE_LIBXML
-
 #define LIBGTOP_XML_NAMESPACE	"http://www.home-of-linux.org/libgtop/1.1"
 
 #include <libxml/parser.h>
@@ -42,8 +40,6 @@ static long _glibtop_backend_nr = 0;
 
 static void _glibtop_init_gmodule_backends (const char *);
 
-#endif /* HAVE_LIBXML */
-
 void
 glibtop_init_backends (void)
 {
@@ -53,15 +49,11 @@ glibtop_init_backends (void)
 	return;
     backends_initialized = 1;
 
-#if HAVE_LIBXML
     LIBXML_TEST_VERSION;
 
     _glibtop_init_gmodule_backends (LIBGTOP_BACKEND_DIR);
-#endif
 }
 
-#if HAVE_LIBXML
-
 static gchar *
 _get_library_filename (xmlDocPtr doc, xmlNodePtr cur, const char *directory)
 {
@@ -227,8 +219,6 @@ _glibtop_init_gmodule_backends (const char *directory)
     closedir (dir);
 }
 
-#endif /* HAVE_LIBXML */
-
 long
 glibtop_register_backend (glibtop_backend_entry *entry)
 {