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-rw-r--r--configure.ac2
1 files changed, 2 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index e04b9684b6..c6cb782d8f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,6 +45,8 @@ AC_LANG_POP(C++)
 AC_PATH_PROG(wget, wget)
 AC_PATH_PROG(xmllint, xmllint)
 AC_PATH_PROG(xsltproc, xsltproc)
+AC_PATH_PROG(flex, flex, false)
+AC_PATH_PROG(bison, bison, false)
 
 AC_ARG_WITH(docbook-catalog, AC_HELP_STRING([--with-docbook-catalog=PATH],
   [path of the DocBook XML DTD]),