linking lapack issue

Question

I am trying to compile a program that uses lapack.

First, I installed lapack by installing all the packages using 'sudo apt-get install' on this link: https://launchpad.net/ubuntu/precise/+source/lapack

I am trying to compile the code on this page: http://www.nag.com/lapack-ex/examples/source/dgbsv-ex.f

I got this program from: http://www.nag.com/lapack-ex/lapack-ex.html

I tried to compile the program by typing

$gfortran dbgsv-ex.f -llapack -lblas

into a terminal

I get a bunch of error messages, all of the form

/usr/lib/gcc/i686-linux-gnu/4.6/../../../../lib/liblapack.so: undefined reference to         
`ATL_strsv'

ie the error messages end with ATL_xxxx . Note also that when I look in my /usr/lib/ I see a file called liblapack.so

Answer 1

As other comments already indicate, your system has an ATLAS implementation of LAPACK. The correct order of library linking (for the non-threaded version of ATLAS) would be then:

-llapack -lf77blas -lcblas -latlas

Also note, that your Fortran code seems to contain also a routine from the NAG Library (x04cef), so you would have to link the NAG Library as well.