[gmx-users] xdr_float and Mac OS X

[Vincent Lemaitre]

Hi,

I am trying to compile gromacs 3.1.5-pre1 for Mac OS X  
(powerpc-apple-darwin6.8).
The compilation for single processor works fine, but I run in trouble  
when compiling with mpi enabled.

Here is the message I get:
...
checking for srfftw_mpi.h... yes
checking for rpc/rpc.h... yes
checking for xdr_float in -lnsl... no
checking for rpc/xdr.h... yes
checking for xdr_float in -lnsl... (cached) no

Basically I have troubles with XDR. From the mailing list, I understand  
that it might involved a library called libnsl.a
I haven't been able to find this library on the mac I am working (on my  
Linux workstation I find it under /usr/lib).

Does anybody knows where the guilty library should be located under Mac  
or/and how to install it?

Thank you in advance,

Vincent




Note: I run several MD using only one processor and had no trouble  
generating xtc files
PS: people that had a similar problem:

Xiaomin Luo wrote:

 > Hi, all. I am sorry that the two previous mails sent by me contain
 > meaningless words, so I send it again. I try to compile Gromacs 3.0.5
 > on SGI Origin3200, and succeed in sequential version. However, it
 > failed when I try to compile a parallel version(--enable-mpi). It
 > says:checking for rpc/rpc.h... yes
 > checking for xdr_float in -lnsl... no
 > configure: WARNING: RPC/XDR libraries not found - disabling xtc
 > checking for rpc/xdr.h... yes
 > checking for xdr_float in -lnsl... (cached) no
 > configure: WARNING: RPC/XDR libraries not found - disabling xtc
 >
 >  
************************************************************************ 
****
 >
 > *WARNING - XDR not found. This cripples GROMACS significantly - you
 > cannot  *
 > *read/write portable trajectories. No choice on windows, but locate
 > the RPC *
 > *header files and libraries if you run UNIX - they do
 > exist!                *
 >
 >  
************************************************************************ 
****It
 > says:checking for rpc/rpc.h... yes
 > checking for xdr_float in -lnsl... yes
 > checking for rpc/xdr.h... yes
 > checking for xdr_float in -lnsl... (cached) yeswhen compile the
 > sequential versionThanks
 >

It's quite simple - your mpi-enabled compiler command cannot find the
library file libnsl.a, which probably means it is not setup correctly
since the file is obviously present on your system. Either ask your
sysadm to fix it, or locate the file yourself and explicitly add that
location as a library search path by putting it in LDFLAGS.

Cheers,

Erik

_____________________________

Vincent Lemaitre

Biomembrane Unit
Biochemistry Department
University of Oxford

South Parks Road
OX1 3QU Oxford
UK

Tel:   +44 (0)1865 275 270
Fax:  +44 (0)1865 275 234

mailto:vincent.lemaitre at bioch.ox.ac.uk