[PD] readanysf~ undefined symbol

[federico]

i installed readanysf~0.13.1, but when i try to create a readanysf~ 
object, gives this error: 
<http://aug.ment.org/software/readanysf%7E0.13.1.tar.gz>

/usr/lib/pd/extra/readanysf~.pd_linux: 
/usr/lib/pd/extra/readanysf~.pd_linux: undefined symbol: 
_ZN16flext_dsp_sharedC2Ev

someone could help me?
I use pd-0.38-4 because 0.39-0 has some midi problems. do I need upgrade? :o
and flext 0.5.0