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I am unable to create a working executable file by running the make command in a tree previously built on an i386 machine. I'm getting an error message in the form of

me@me-desktop:~$  make
/usr/bin/ld: i386 architecture of input file `../.. /Lib/libProgram.a(something.o)' is incompatible with i386:x86-64 output

I've been told and reassured that this program has been tested and successfully compiled on 64-bit Fedora.

I'm running a 64-bit machine

me@me-desktop:~$  uname -m

I'm running Ubuntu 10.04

me@me-desktop:~$  lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 10.04.3 LTS
Release:    10.04
Codename:    lucid

I'm using g++

# me@me-desktop:~$ g++ --version
g++ (Ubuntu 4.4.3-4ubuntu5) 4.4.3
Copyright (C) 2009 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO

I'm also using libtool

# me@me-desktop:~$ libtool --version (GNU libtool) 2.2.6b
Written by Gordon Matzigkeit <>, 1996

Any clues as to what is going wrong?

share|improve this question
are you building from source - or are you linking against prebuilt object/library files? If the latter - are you sure these libraries/objects are actually 64bit? – fossfreedom Sep 7 '11 at 21:32
Hi fossfreedom, sorry for the newb factor... I have no idea if these are linking against "prebuilt object/library files". There are no executable files that came with it. How do I determine if there are "prebuilt object/library files"? – user784637 Sep 7 '11 at 22:17
up vote 3 down vote accepted

There are a some possibilities:

  • need to run ./configure before make (if copied over from 386-machine)
  • need to run ./ (if checked out from version control with no configure script given)
share|improve this answer
Thanks aquaherd, I can confirm this was copied from a 386-machine. I will try this out once I get access to my 64-bit ubuntu at home in like 4 hours. – user784637 Sep 7 '11 at 22:15
In this case, doing a make clean before ./configure would help. Also, if an is present, issuing make distclean may force the regeneration of the configure script for x86_64. – aquaherd Sep 7 '11 at 22:55

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