[SoX-users] sox FAIL ladspa: could not open LADSPA plugin

[bl4 <bl4...@pl...>]

I have SoX 14.3.1 compiled from source on debian stable. I want to use a 
ladspa plugin:

sox a.wav b.wav ladspa /usr/lib/ladspa/mbeq_1197.so mbeq -0.8 -1.3 -1.7 
-3 ...

I get an error:

sox FAIL ladspa: could not open LADSPA plugin /usr/lib/ladspa/mbeq_1197.so

The path is correct and the plugin is good since I can use it in other 
applications. If I understand correctly, the problem is in ladspa.c 
function sox_ladspa_getopts. It calls lt_dlopenext which returns null. 
libltdl-dev is installed and the configure script picked it up. I tried 
to call lt_dlerror after lt_dlopenext, it should return an error string 
but it also returns null.

-- 
bl4