Index: branches/apertium-tagger/experiments/shell_wrappers.py
===================================================================
--- branches/apertium-tagger/experiments/shell_wrappers.py	(revision 72277)
+++ branches/apertium-tagger/experiments/shell_wrappers.py	(revision 72278)
@@ -15,6 +15,10 @@
 CG_TAG_RE = re.compile(br'(<SELECT:[0-9]+>)|(<REMOVE:[0-9]+>)')
 
 
+def apertium_tagger():
+    return os.environ.get('APETAG', 'apertium-tagger')
+
+
 def run(func):
     @functools.wraps(func)
     def inner(*args, **kwargs):
@@ -109,7 +113,7 @@
 def tagger_train_percep(model_fn, train_fn, sent_seg=False,
                         trainsrc_fn=None, mtx_fn=None, iterations=10):
     cmd = [
-        'apertium-tagger',
+        apertium_tagger(),
         '--skip-on-error',
         '-xs',
         str(iterations),
@@ -126,7 +130,7 @@
 def tagger_train_sup(model_type, model_fn, train_fn,
                      trainsrc_fn=None, dic_fn=None, tsx_fn=None, iterations=0,
                      ambg_classes=10, cg_aug=0, cgtrain_fn=None):
-    cmd = ['apertium-tagger', '--supervised={}'.format(iterations)]
+    cmd = [apertium_tagger(), '--supervised={}'.format(iterations)]
     if (not all((trainsrc_fn, dic_fn, tsx_fn)) and
             not model_type.startswith('unigram')):
         raise ValueError("Optional arguments required for non-unigram models")
@@ -158,7 +162,7 @@
                        cgtrain_fn=None):
     if model_fn.startswith('unigram'):
         raise ValueError("No unsupervised training for unigram models")
-    cmd = ['apertium-tagger', '--train={}'.format(iterations)]
+    cmd = [apertium_tagger(), '--train={}'.format(iterations)]
     if model_type == 'lwsw':
         cmd.append('--sliding-window')
     if cg_aug:
@@ -176,7 +180,7 @@
 
 @proc_filter
 def tagger_tag(model_type, model_fn, cg_fn=None, cg_aug=None, debug=False):
-    cmd = ['apertium-tagger', '--tagger', '--show-superficial', model_fn]
+    cmd = [apertium_tagger(), '--tagger', '--show-superficial', model_fn]
     if cg_aug:
         cmd.append('--cg-augmented={}'.format(cg_aug))
     if cg_fn: