From: Amr Rizq (
Date: Wed Mar 04 2009 - 08:55:33 CST

Hi John,

I'm working on Linux Ubuntu 8.04 (Hardy Heron). The compiler I used for VMD 1.8.6 was g++ 4.2.
Do you mean that trying to switch to old compiler (like switching to g++ 3.4) can solve the problem?

best regards,


Eng. Amr Rizq

Software Engineer

International School of Information Science (ISIS)

Bibliotheca Alexandrina

P. O. Box 138, Shatby

Alexandria 21526, Egypt

Tel: +(203) 483 9999, Extension: 1417

Fax: (203) 482 0405


Web Site:

From: John Stone []
Sent: Wednesday, March 04, 2009 4:34 PM
To: Amr Rizq
Cc: Vmd l
Subject: Re: vmd-l: Problem in IMD with Compiled VMD

  What platform are you compiling for, and with which compiler+version?
This may be caused by some difference in the behavior of the compiler
you're using versus the ones we use.

  John Stone

On Wed, Mar 04, 2009 at 02:00:58PM +0200, Amr Rizq wrote:
> Dear all,
> When I tried to make an IMD Simulation by using a compiled VMD 1.8.6 source (I compiled using OpenGL option for display device), I cannot connect to a running NAMD 2.6 (from VMD Menu: Extensions->Simulation->IMD Connect). I always receive the following error (in VMD log):
> ERROR) Unable to ascertain relative endianness of remote machine
> Investigating the NAMD log I noticed that error:
> Warning: Incompatible Interactive MD, use VMD v1.4b2 or higher
> Warning: IMD connection failed
> But I could be able to connect between the distributed binary version of VMD and binary distributed or compiled version of NAMD. For a version of VMD which I compiled myself and tried to connect to a running NAMD, I failed to connect.
> What's wrong here?And why didn't VMD, which I compiled, connect to NAMD?
> Best regards,
> Amr Rizq

NIH Resource for Macromolecular Modeling and Bioinformatics
Beckman Institute for Advanced Science and Technology
University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
Email:                 Phone: 217-244-3349
  WWW:      Fax: 217-244-6078