diff --git a/portage/frameworks/extra-cmake-modules/extra-cmake-modules.py b/portage/frameworks/extra-cmake-modules/extra-cmake-modules.py
index 4eb215589..586f606e1 100644
--- a/portage/frameworks/extra-cmake-modules/extra-cmake-modules.py
+++ b/portage/frameworks/extra-cmake-modules/extra-cmake-modules.py
@@ -1,16 +1,18 @@
 import info
 
 class subinfo(info.infoclass):
     def setTargets( self ):
         self.versionInfo.setDefaultValues( )
 
     def setDependencies( self ):
         self.buildDependencies['virtual/base'] = 'default'
         self.buildDependencies['dev-util/png2ico'] = 'default'
+        # needed for many kf5's
+        self.buildDependencies['dev-util/winflexbison'] = 'default'
 
 from Package.CMakePackageBase import *
 
 class Package(CMakePackageBase):
     def __init__( self ):
         CMakePackageBase.__init__( self )