############################################################
# Building 'tdgesv' and sample output on sgi1, an SGI 
# Octane, running IRIX64 6.4
#############################################################
sgi1% pwd; ls
/usr/people/phys410/linsys/ex1
Makefile   tdgesv.f

sgi1% printenv LIBBLAS
-lblas

sgi1% cat Makefile
############################################################
#  IMPORTANT: Note the use of LIBBLAS which should be 
#  set to '-lblas' on the SGI and Linux machines.  
#  BLAS is a acronym for Basic Linear Algebra Support 
#  and is a Fortran- and C-callable library which implements 
#  basic manipulations useful in numerical linear algebra.
############################################################
.IGNORE:

F77_COMPILE  = $(F77) $(F77FLAGS) $(F77CFLAGS)
F77_LOAD     = $(F77) $(F77FLAGS) $(F77LFLAGS)

.f.o:
        $(F77_COMPILE) $*.f

EXECUTABLES = tdgesv

all: $(EXECUTABLES)

tdgesv: tdgesv.o 
        $(F77_LOAD) tdgesv.o -llapack $(LIBBLAS) -o tdgesv

clean:
        rm *.o
        rm $(EXECUTABLES)

sgi1% make
f77 -g -64 -c tdgesv.f
f77 -g -64 -L/usr/local/lib tdgesv.o -llapack -lblas -o tdgesv

sgi1% tdgesv
 5.426364412431639  -0.3257753768173935 -0.4083508069894624