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fix segfault with some ladspa plugins.

--- a/ChangeLog

+++ b/ChangeLog

@@ -40,6 +40,7 @@

   o F.R. [3051700] spectrogram -r for `raw' spectrogram, no legend.  (robs)

   o Fix -w option on stats effect. (Ronald Sprouse)

+  o Fix segfault with some ladspa plugins (Thor Andreassen)

 Other new features:

--- a/src/ladspa.c

+++ b/src/ladspa.c

@@ -103,8 +103,9 @@

   path = getenv("LADSPA_PATH");

   if (path == NULL)

     path = LADSPA_PATH;

-  lt_dlsetsearchpath(path);

-  if ((l_st->lth = lt_dlopenext(l_st->name)) == NULL) {

+

+  if(lt_dlinit() || lt_dlsetsearchpath(path)

+      || (l_st->lth = lt_dlopenext(l_st->name)) == NULL) {

     lsx_fail("could not open LADSPA plugin %s", l_st->name);

     return SOX_EOF;

   }