AX_PTHREAD([], [AC_MSG_ERROR(["cannot find pthreads library"])])
# ------------------------------ libxml2 --------------------------------------
-AC_CHECK_LIB([xml2], [xmlParseFile], [],
+AC_CHECK_LIB([xml2], [xmlReadMemory], [],
[AC_MSG_ERROR(["cannot find libxml2"])])
PKG_CHECK_MODULES([LIBXML2], [libxml-2.0])
PKGCONFIG_PRIVATE_REQUIRES="$PKGCONFIG_PRIVATE_REQUIRES libxml-2.0"