diff --git a/pkgs/development/tools/parsing/flex/builder.sh b/pkgs/development/tools/parsing/flex/builder.sh
new file mode 100644
index 000000000000..03bddded882f
--- /dev/null
+++ b/pkgs/development/tools/parsing/flex/builder.sh
@@ -0,0 +1,10 @@
+. $stdenv/setup
+
+installPhase() {
+   make install
+   cd $out/bin; ln -s flex lex
+   cd $out/lib; ln -s libfl.a libl.a
+}
+
+installPhase=installPhase
+genericBuild