1 files changed, 2 insertions, 0 deletions
diff --git a/configure b/configure
index b2f8c33380c..cabe2d52d7b 100755
--- a/configure
+++ b/configure
@@ -645,6 +645,8 @@ probe CFG_ISCC             iscc
 probe CFG_JAVAC            javac
 probe CFG_ANTLR4           antlr4
 probe CFG_GRUN             grun
+probe CFG_FLEX             flex
+probe CFG_BISON            bison
 probe CFG_PANDOC           pandoc
 probe CFG_PDFLATEX         pdflatex
 probe CFG_XELATEX          xelatex