Building Octave from source

Hi,
I have built Octave from source using the instructions from the Octave
building website <http://wiki.octave.org/Building>. I used the debian
maintainers site
<https://salsa.debian.org/pkg-octave-team/octave/blob/master/debian/control>
to get the debian packages that can be installed using apt. So after
installing all the dependencies, I used the following code:

hg clone https://www.octave.org/hg/octave && \
cd octave                                  && \
./bootstrap
mkdir .build                            && \
cd    .build                            && \
./../configure --prefix=$HOME/my_octave

But using the above I get the following error:
configure: WARNING: SUNDIALS IDA library not configured with
SUNLINSOL_KLU or sunlinksol_klu.h is not usable.
The solvers ode15i and ode15s will not support the sparse Jacobian feature.

I managed to build Octave using the command,
./../configure --prefix=$HOME/my_octave CPPFLAGS="-I/usr/include/suitesparse"

 Because I found the klu.h library inside suitesparse.How can I add
this to the configure.ac

so that next time I can just configure using:
./../configure --prefix=$HOME/my_octave

Can someone please help me out?