File ardour-use_old_zita_crap.patch of Package ardour

diff --git a/libs/zita-convolver/wscript b/libs/zita-convolver/wscript
index 5a75c028f5..3bde65575c 100644
--- a/libs/zita-convolver/wscript
+++ b/libs/zita-convolver/wscript
@@ -29,17 +29,11 @@ def options(opt):
     autowaf.set_options(opt)
 
 def configure(conf):
-    if conf.is_defined('USE_EXTERNAL_LIBS'):
-        autowaf.check_pkg(conf, 'zita-convolver', uselib_store='LIBZCONVOLVER', atleast_version=ZCONVOLVER_LIB_VERSION, mandatory=True)
-    else:
-        conf.load ('compiler_cxx')
-        autowaf.configure(conf)
-        autowaf.check_pkg(conf, 'fftw3f', uselib_store='FFTW3F', mandatory=True)
+    conf.load ('compiler_cxx')
+    autowaf.configure(conf)
+    autowaf.check_pkg(conf, 'fftw3f', uselib_store='FFTW3F', mandatory=True)
 
 def build(bld):
-    if bld.is_defined('USE_EXTERNAL_LIBS'):
-        return
-
     obj = bld.stlib(features = 'cxx cxxstlib', source = 'zita-convolver.cc')
     obj.cxxflags        = [ '-fPIC', '-O3', '-ffast-math', '-funroll-loops' ]
     obj.export_includes = ['.']