URL to SGESV documentation

https://www.netlib.org/lapack/explore-html/d8/da6/group__gesv_ga5ac9906b2a7bca68858dfe016552afde.html#ga5ac9906b2a7bca68858dfe016552afde

After downloading the LAPACK library source via

wget http://www.netlib.org/lapack/lapack-3.7.0.tgz

I followed the instructions in the README file and used make to compile the lapack libraries.

I needed to compile the BLAS routines (included in another directory), also with make.

One can either include the libraries explicitly in the compilation,

 gfortran testSGESV.f90 lapack-3.7.0/lib*.a


or tell the compiler where to look for the libaries (with -L<path>) and which libraries to use (-l<name>)

 gfortran testSGESV.f90  -L./lapack-3.7.0 -llapack -lrefblas

Note that the libraries are useless to you unless they are compiled/installed!


UPDATE: LAPACK has been installed on alfven, so I now can compile with

 gfortran testSGESV.f90 /usr/lib64/liblapack.so.3.6.1
or
 gfortran testSGESV.f90 -l:liblapack.so.3
-llapack won't work because by default linker searches for "liblapacke.so"

On macos, use:
gfortran testSGESV.f90 -framework accelerate

Compiling C code on Alfven:
gcc test-COL.c  -I. -o test-COL /usr/lib64/liblapacke.so.3
gcc test-ROW.c  -I. -o test-ROW /usr/lib64/liblapacke.so.3

or 
gcc test-ROW.c  -I. -o test-ROW -l:liblapacke.so.3
gcc test-ROW.c  -I. -o test-ROW -llapacke (won 't work because by default linker searches for "liblapacke.so", not "liblapacke.so.3")

What I used on my Mac
gcc test-ROW.c -o testROW -I.  -L/Users/saika/COURSES/P3800-stuff/LAPACK/lapack-3.7.0 -llapacke -llapack -lrefblas -L/usr/local/gfortran/lib/ -lgfortran

or after using 
brew install lapack

gcc -I/usr/local/opt/lapack/include -L/usr/local/opt/lapack/lib test-COL.c  -llapack -llapacke

Steps for installing

wget http://www.netlib.org/lapack/lapack-3.8.0.tar.gz
tar -zxf lapack-3.8.0.tar.gz 
cd lapack-3.8.0/
(explore)
less README.md 
ls INSTALL
cp make.inc.example make.inc
less Makefile
time make
(real	7m43.916s)

cd LAPACKE
make
time make
(real	5m2.832s)
cd ..
ls lib*
liblapack.a  liblapacke.a  librefblas.a  libtmglib.a

Install on Ubuntu
sudo apt-get install libblas-dev liblapack-dev 

Afterwards, you should be able to compile with 
gfortran testSGESV.f90  -llapack 

google install mkl (Intel Math Kernel Library)