diff --git a/src/p_lx_interp.h b/src/p_lx_interp.h
new file mode 100644
index 00000000..352c2829
--- /dev/null
+++ b/src/p_lx_interp.h
@@ -0,0 +1,64 @@
+/* p_lx_interp.h --
+
+   This file is part of the UPX executable compressor.
+
+   Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1996-2004 Laszlo Molnar
+   Copyright (C) 2000-2004 John F. Reiser
+   All Rights Reserved.
+
+   UPX and the UCL library are free software; you can redistribute them
+   and/or modify them under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of
+   the License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; see the file COPYING.
+   If not, write to the Free Software Foundation, Inc.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+   Markus F.X.J. Oberhumer   Laszlo Molnar           John F. Reiser
+   markus@oberhumer.com      ml1050@cdata.tvnet.hu   jreiser@BitWagon.com
+ */
+
+
+#ifndef __UPX_P_LX_INTERP_H  //{
+#define __UPX_P_LX_INTERP_H
+
+
+/*************************************************************************
+// linux/interp386
+**************************************************************************/
+
+class PackLinuxI386interp : public PackLinuxI386elf
+{
+    typedef PackLinuxI386elf super;
+public:
+    PackLinuxI386interp(InputFile *f);
+    virtual ~PackLinuxI386interp();
+    virtual int getVersion() const { return 13; }
+    virtual int getFormat() const { return UPX_F_LINUX_ELFI_i386; }
+    virtual const char *getName() const { return "linux/elfi386"; }
+
+    virtual bool canPack();
+    virtual void unpack(OutputFile *fo);
+
+protected:
+    virtual void pack1(OutputFile *, Filter &);  // generate executable header
+    virtual void pack2(OutputFile *, Filter &);  // append compressed data
+    virtual void pack3(OutputFile *, Filter &);  // build loader
+};
+
+
+#endif /*} already included */
+
+
+/*
+vi:ts=4:et
+*/
+
diff --git a/src/packmast.cpp b/src/packmast.cpp
index 9d4ac0ac..068758ca 100644
--- a/src/packmast.cpp
+++ b/src/packmast.cpp
@@ -41,6 +41,7 @@
 #include "p_lx_elf.h"
 #include "p_lx_sep.h"
 #include "p_lx_sh.h"
+#include "p_lx_interp.h"
 #include "p_sys.h"
 #include "p_tos.h"
 #include "p_wcle.h"
@@ -51,6 +52,7 @@
 #include "p_vmlinz.h"
 #include "p_vmlinx.h"
 #include "p_ps1.h"
+#include "p_mach.h"
 
 
 /*************************************************************************
@@ -206,6 +208,12 @@ static Packer* try_packers(InputFile *f, try_function func)
                 return p;
         }
 #endif
+        if (opt->o_unix.use_ptinterp) {
+            if ((p = func(new PackLinuxI386interp(f),f)) != NULL)
+                return p;
+        }
+        if ((p = func(new PackLinuxElf32ppc(f),f)) != NULL)
+            return p;
         if ((p = func(new PackLinuxI386elf(f),f)) != NULL)
             return p;
         if ((p = func(new PackLinuxI386sh(f),f)) != NULL)
@@ -228,6 +236,10 @@ static Packer* try_packers(InputFile *f, try_function func)
     if ((p = func(new PackCom(f),f)) != NULL)
         return p;
 
+    // Mach (MacOS X PowerPC)
+    if ((p = func(new PackMachPPC32(f), f)) != NULL)
+        return p;
+
     return NULL;
 }