[gmx-users] Installation with non standard location of fftw3

[Justin A. Lemkul]

Graham Kettlewell wrote:
> Hi,
> 
> I have to install gromacs on a 30 node cluster computer. I only have access to a specific space on the cluster, and it didn't have fftw3 installed on it. I have installed it, and set the CPPFLAGS and LDFLAGS environment variables as per instructions. The include and lib directories exist, and the environment variables are correct.
> 
> When I tried to install without fftw3 installed I got the following:
> 
> checking for fftw3.h... configure: error: Cannot find the default external FFT library (fftw3).
> Other alternatives are 'fftw2', or 'mkl' for Intel MKL.
> You are STRONGLY recommended to use one of these - fftw is free.
> 
> Use CPPFLAGS and LDFLAGS if the library is installed in a
> non-standard location. (see FAQ at http://www.gromacs.org)
> 
> Now with the environment variables set I get: 
> 
> checking for fftw3.h... yes
> checking for main in -lfftw3f... no
> configure: error: Cannot find fftw3f library
> 
> fftw3 is installed in /hpc/software/packages/chemistry/fftw
> 
> The export commands are:
> 
> -sh-3.2$ export CPPFLAGS=-I/hpc/software/packages/chemistry/fftw/include
> -sh-3.2$ export LDFLAGS=-I/hpc/software/packages/chemistry/fftw/lib
> 

You want this line to contain -L, not -I.

-Justin

> as per installation documentation:
> 
> * GROMACS tries to find FFTW and all optional libraries (like Lesstif and FFTW)
> automatically, but this requires that they are present in the default places where the
> system searches for include files and libraries. If this is not the case (for instance,
> your system might not look in /usr/local/include and /usr/local/lib where FFTW is
> placed) you can tell configure to include these catalogues by using the variables
> CPPFLAGS and LDFLAGS for includes and libraries, respectively.
> For instance, assume we have installed FFTW with --prefix=/home/joe/fftw.
> 
> ...
> 
> or, if you are using a bash shell:
> * export CPPFLAGS=-I/home/joe/fftw/include
>   export LDFLAGS=-L/home/joe/fftw/lib
> 
> Both of these directories exist, and the fftw install seemed to run without errors.
> 
> Any help would be greatly appreciated, as I am running out of ideas. I have tried to find the faq page, but without success.
> 
> Thanks.
> 
> Cheers,
> 
> ****************************************
> Graham Kettlewell
> Research assistant
> Centre for Atmospheric Chemistry
> University of Wollongong
> grahamk at uow.edu.au
> Tel: (61 2) 4221 5120
> Fax: (61 2) 4221 4287
> Mob: 0414 309 524
> ****************************************
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-- 
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Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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