setenv.patch

diff --git a/src/node.cc b/src/node.cc
index f6ae19d..04ff7d1 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -1887,7 +1887,7 @@ static Handle<Value> EnvSetter(Local<String> property,
   String::Utf8Value val(value);
 
 #ifdef __POSIX__
-  setenv(*key, *val, 1);
+  if (setenv(*key, *val, 1)) return Undefined();
 #else  // __WIN32__
   int n = key.length() + val.length() + 2;
   char* pair = new char[n];