[gcompris/gcomprixogoo] Support GNUCAP environment variable

[Bruno Coudoin <bcoudoin src gnome org>]

commit c2a4cc27ce8bd72a5b842e477bd7653a0af0580f
Author: Aleksey Lim <alsroot member fsf org>
Date:   Wed May 26 05:39:36 2010 +0000

    Support GNUCAP environment variable
    
    Will be useful in 0install environment when GnuCap is installed from 0install feed.

 src/electric-activity/electric.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/electric-activity/electric.py b/src/electric-activity/electric.py
index e9251a6..d8d6062 100644
--- a/src/electric-activity/electric.py
+++ b/src/electric-activity/electric.py
@@ -85,7 +85,8 @@ class Gcompris_electric:
     #
     # You can provide a gnucap binary in python_plugin_dir.
     #
-    for binary in (os.path.join(gcompris.PYTHON_PLUGIN_DIR, 'bin', 'gnucap'),
+    for binary in (os.environ.get('GNUCAP', ''),
+                   os.path.join(gcompris.PYTHON_PLUGIN_DIR, 'bin', 'gnucap'),
                    "/usr/bin/gnucap",
                    "/usr/local/bin/gnucap",
                    "gnucap.exe",