diff --git a/system/devel/flex/pspec.xml b/system/devel/flex/pspec.xml
index 595f21f9..610f3ed6 100644
--- a/system/devel/flex/pspec.xml
+++ b/system/devel/flex/pspec.xml
@@ -16,6 +16,7 @@
         <BuildDependencies>
             <Dependency>patch</Dependency>
             <Dependency>texinfo</Dependency>
+            <Dependency>help2man</Dependency>
         </BuildDependencies>
         <Patches>
 <!--             <Patch level="1">flex-2.5.37-notex.patch</Patch> -->