configure: WARNING: UMFPACK not found (although installed)

[Norbert Hauser]

I am desperately trying to compile octave-2.9.6.

I have installed SuiteSparse including UMFPACK and metis.
I have set
 export LDFLAGS=-L $HOME/tmp/SuiteSparse/UMFPACK/Lib/
 export CFLAGS=-I $HOME/tmp/SuiteSparse/UMFPACK/Include/

When running
cd $HOME/tmp/octave-2.9.6
./configure
somewhere near the end of config.log I read the following error messages (see 
below). 
What can I do against "WARNING: UMFPACK not found."? Do I have to set 
--with-umfpack=yes (or =some lib)?

Regards,
Norbert

Here is part of the config.log:
[...]
Octave is now configured for i686-pc-linux-gnu

  Source directory:     .
  Installation prefix:  /usr/local
  C compiler:           gcc  -mieee-fp  -Wall -W -Wshadow -I 
/home/jhauschildt/tmp/SuiteSparse/UMFPACK/Include/
  C++ compiler:         g++   /home/jhauschildt/tmp/SuiteSparse/UMFPACK/Include/
  Fortran compiler:     gfortran -O -mieee-fp
  Fortran libraries:     -L../SuiteSparse/UMFPACK/Lib/ 
-L/usr/lib/gcc/i586-suse-linux/4.1.0 -L/usr/lib/gcc/i586-suse-linu\
x/4.1.0/../../../../i586-suse-linux/lib 
-L/usr/lib/gcc/i586-suse-linux/4.1.0/../../.. -lz -lgfortranbegin -lgfortran 
-lm \
-lgcc_s
  BLAS libraries:       -llapack -lblas
  FFTW libraries:
  GLPK libraries:
  UMFPACK libraries:
  COLAMD libraries:
  CCOLAMD libraries:
  CHOLMOD libraries:
  CXSPARSE libraries:
  HDF5 libraries:
  LIBS:                 -lreadline  -lncurses -ldl -lz -lm
  Default pager:        less
  gnuplot:              gnuplot

  Do internal array bounds checking:  false
  Build static libraries:             false
  Build shared libraries:             true
  Dynamic Linking:                    true (dlopen)
  Include support for GNU readline:   true
  64-bit array dims and indexing:     false

configure:29553: WARNING: UMFPACK not found.  This will result in some lack of 
functionality for sparse matrices.
configure:29559: WARNING: COLAMD not found. This will result in some lack of 
functionality for sparse matrices.
configure:29565: WARNING: CCOLAMD not found. This will result in some lack of 
functionality for sparse matrices.
configure:29571: WARNING: CHOLMOD not found. This will result in some lack of 
functionality for sparse matrices.
configure:29577: WARNING: CXSparse not found. This will result in some lack of 
functionality for sparse matrices.
configure:29583: WARNING: HDF5 library not found.  Octave will not be able to 
save or load HDF5 data files.
configure:29629:
[...]
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