From ace7910a44cf3cb0437052c522b1dce6c7664929 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Wed, 1 Jul 2009 13:34:29 +0000
Subject: [PATCH] Support $MAIN_DIR for the poor C++ users

---
 dtool/src/dtoolutil/executionEnvironment.cxx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/dtool/src/dtoolutil/executionEnvironment.cxx b/dtool/src/dtoolutil/executionEnvironment.cxx
index 613950e14b..57ad86da65 100644
--- a/dtool/src/dtoolutil/executionEnvironment.cxx
+++ b/dtool/src/dtoolutil/executionEnvironment.cxx
@@ -537,6 +537,11 @@ read_args() {
   }
 #endif
 
-  if (_dtool_name.empty())
+  if (!_binary_name.empty()) {
+    set_environment_variable("MAIN_DIR", Filename(_binary_name).get_dirname());
+  }
+
+  if (_dtool_name.empty()) {
     _dtool_name = _binary_name;
+  }
 }