diff --git a/src/com/sheepit/client/Client.java b/src/com/sheepit/client/Client.java
index 4ef0d4e..1b498be 100644
--- a/src/com/sheepit/client/Client.java
+++ b/src/com/sheepit/client/Client.java
@@ -35,6 +35,8 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Calendar;
 import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.BlockingQueue;
 
@@ -522,6 +524,10 @@ public class Client {
 		
 		String[] command = new String[size_command];
 		
+		Map<String, String> new_env = new HashMap<String, String>();
+		
+		new_env.put("BLENDER_USER_CONFIG", this.config.workingDirectory.getAbsolutePath().replace("\\", "\\\\"));
+ 				
 		int index = 0;
 		for (int i = 0; i < command1.length; i++) {
 			if (command1[i].equals(".c")) {
@@ -580,7 +586,7 @@ public class Client {
 			String line;
 			this.log.debug(Arrays.toString(command));
 			OS os = OS.getOS();
-			ajob.setProcess(os.exec(command));
+			ajob.setProcess(os.exec(command, new_env));
 			BufferedReader input = new BufferedReader(new InputStreamReader(ajob.getProcess().getInputStream()));
 			
 			long last_update_status = 0;
diff --git a/src/com/sheepit/client/os/Linux.java b/src/com/sheepit/client/os/Linux.java
index dff2c44..a6843d9 100644
--- a/src/com/sheepit/client/os/Linux.java
+++ b/src/com/sheepit/client/os/Linux.java
@@ -122,7 +122,7 @@ public class Linux extends OS {
 	}
 	
 	@Override
-	public Process exec(String[] command) throws IOException {
+	public Process exec(String[] command, Map<String, String> env_overight) throws IOException {
 		// the renderer have a lib directory so add to the LD_LIBRARY_PATH
 		// (even if we are not sure that it is the renderer who is launch
 		
@@ -155,6 +155,9 @@ public class Linux extends OS {
 		builder.redirectErrorStream(true);
 		Map<String, String> env = builder.environment();
 		env.putAll(new_env);
+		if (env_overight != null) {
+			env.putAll(env_overight);
+		}
 		return builder.start();
 	}
 	
diff --git a/src/com/sheepit/client/os/Mac.java b/src/com/sheepit/client/os/Mac.java
index ac8ca87..b59f5be 100644
--- a/src/com/sheepit/client/os/Mac.java
+++ b/src/com/sheepit/client/os/Mac.java
@@ -22,6 +22,7 @@ import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.util.Map;
 
 import com.sheepit.client.Log;
 import com.sheepit.client.Utils;
@@ -140,7 +141,7 @@ public class Mac extends OS {
 	}
 	
 	@Override
-	public Process exec(String[] command) throws IOException {
+	public Process exec(String[] command, Map<String, String> env) throws IOException {
 		String[] actual_command = command;
 		if (this.hasNiceBinary == null) {
 			this.checkNiceAvailability();
@@ -154,6 +155,9 @@ public class Mac extends OS {
 		}
 		ProcessBuilder builder = new ProcessBuilder(actual_command);
 		builder.redirectErrorStream(true);
+		if (env != null) {
+			builder.environment().putAll(env);
+		}
 		return builder.start();
 	}
 	
diff --git a/src/com/sheepit/client/os/OS.java b/src/com/sheepit/client/os/OS.java
index 748cc70..e7687bb 100644
--- a/src/com/sheepit/client/os/OS.java
+++ b/src/com/sheepit/client/os/OS.java
@@ -19,6 +19,7 @@
 package com.sheepit.client.os;
 
 import java.io.IOException;
+import java.util.Map;
 
 import com.sheepit.client.hardware.cpu.CPU;
 
@@ -37,9 +38,12 @@ public abstract class OS {
 		return null;
 	}
 	
-	public Process exec(String[] command) throws IOException {
+	public Process exec(String[] command, Map<String, String> env) throws IOException {
 		ProcessBuilder builder = new ProcessBuilder(command);
 		builder.redirectErrorStream(true);
+		if (env != null) {
+			builder.environment().putAll(env);
+		}
 		return builder.start();
 	}
 	
diff --git a/src/com/sheepit/client/os/Windows.java b/src/com/sheepit/client/os/Windows.java
index 779438a..9e04b0e 100644
--- a/src/com/sheepit/client/os/Windows.java
+++ b/src/com/sheepit/client/os/Windows.java
@@ -19,6 +19,7 @@
 package com.sheepit.client.os;
 
 import java.io.IOException;
+import java.util.Map;
 
 import com.sheepit.client.hardware.cpu.CPU;
 import com.sheepit.client.os.windows.Kernel32Lib;
@@ -106,7 +107,7 @@ public class Windows extends OS {
 	}
 	
 	@Override
-	public Process exec(String[] command) throws IOException {
+	public Process exec(String[] command, Map<String, String> env) throws IOException {
 		// disable a popup because the renderer might crash (seg fault)
 		Kernel32Lib kernel32lib = null;
 		try {
@@ -125,6 +126,9 @@ public class Windows extends OS {
 		
 		ProcessBuilder builder = new ProcessBuilder(command);
 		builder.redirectErrorStream(true);
+		if (env != null) {
+			builder.environment().putAll(env);
+		}
 		Process p = builder.start();
 		WinProcess wproc = new WinProcess(p);
 		wproc.setPriority(WinProcess.PRIORITY_BELOW_NORMAL);