diff --git a/PBot/VERSION.pm b/PBot/VERSION.pm
index 46274cb1..b70182dd 100644
--- a/PBot/VERSION.pm
+++ b/PBot/VERSION.pm
@@ -13,7 +13,7 @@ use warnings;
 # These are set automatically by the build/commit script
 use constant {
   BUILD_NAME     => "PBot",
-  BUILD_REVISION => 488,
+  BUILD_REVISION => 489,
   BUILD_DATE     => "2014-02-25",
 };
 
diff --git a/modules/compiler_vm/compiler_output_merger.pl b/modules/compiler_vm/compiler_output_merger.pl
new file mode 100755
index 00000000..b9f53dea
--- /dev/null
+++ b/modules/compiler_vm/compiler_output_merger.pl
@@ -0,0 +1,50 @@
+#!/usr/bin/perl
+
+use warnings;
+use strict;
+
+use IPC::Open2;
+use Fcntl qw/:flock/;
+
+my $outfile = '.output';
+
+sub write_output {
+  my ($msg) = @_;
+
+  print "output: writing [$msg]\n";
+
+  open my $fh, '>>', $outfile;
+  flock $fh, LOCK_EX;
+  print $fh "$msg\n";
+  print "output: wrote [$msg]\n";
+  close $fh;
+}
+
+sub merge {
+  my ($file) = @_;
+
+  # create empty file
+  open my $fh, '>', $file;
+  close $fh;
+
+  my ($out, $in);
+  open2 $out, $in, "tail -f $file";
+  print "merging $file to $outfile\n";
+  while(my $line = <$out>) {
+    chomp $line;
+    print "$file: got [$line]\n";
+    write_output $line;
+  }
+}
+
+my $pid = fork();
+die "fork failed: $!" if not defined $pid;
+
+if($pid == 0) {
+  merge '.gdb_output';
+  exit;
+} else {
+  merge '.prog_output';
+}
+
+waitpid $pid, 0;
diff --git a/modules/compiler_vm/compiler_watchdog.pl b/modules/compiler_vm/compiler_watchdog.pl
index b1ab850b..e7fe2a2f 100755
--- a/modules/compiler_vm/compiler_watchdog.pl
+++ b/modules/compiler_vm/compiler_watchdog.pl
@@ -19,15 +19,18 @@ my $local_vars = "";
 sub flushall;
 sub gdb;
 
+use IO::Handle;
+
 sub execute {
     my ($cmdline) = @_;
     my ($ret, $result);
 
+    open my $output_file, '>>', '.gdb_output' or die "Couldn't open .output: $!";
+    $output_file->autoflush(1);
+
     my ($out, $in);
     open2($out, $in, "$cmdline 2>&1");
 
-    open my $output_file, '>>', '.output' or die "Couldn't open .output: $!";
-
     while(my $line = <$out>) {
         chomp $line;
         print "--- got: [$line]\n" if $debug >= 1;
@@ -84,7 +87,7 @@ sub execute {
             gdb $in, "break $break\n";
             gdb $in, "set width 0\n";
             gdb $in, "set height 0\n";
-            gdb $in, "run < .input > .output\n";
+            gdb $in, "run < .input >> .prog_output\n";
             next;
         }