diff --git a/configure.ac b/configure.ac
index 6ccdff9..c3eec8b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,6 +3,8 @@ AM_INIT_AUTOMAKE([-Wall -Werror foreign])
 AC_PROG_CC
 AC_PROG_LEX
 AC_PROG_YACC
+PKG_CHECK_MODULES([libxml2], [libxml-2.0])
+PKG_CHECK_MODULES([libxslt], [libxslt])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_FILES([
   Makefile