I'm facing the problem also whith sedumi 1.21


>> addpath(genpath('G:\MATLAB\R2007b\toolbox\SeDuMi_1_21'))
>> cd('G:\MATLAB\R2007b\toolbox\SeDuMi_1_21')
>> install_sedumi
Building SeDuMi binaries...
mex -O -DPC bwblkslv.c sdmauxFill.c sdmauxRdot.c "G:\MATLAB\R2007b\extern\lib\win32\microsoft\libmwblas.lib"

Warning: Renaming "bwblkslv.dll" to "bwblkslv.dll.old" to avoid name conflicts.

Writing library for bwblkslv.mexw32
c:\docume~1\johny\locals~1\temp\mex_3a396daf-6421-4969-07ab-c52fb8f07920\sdmauxrdot.obj .text: undefined reference to '_ddot'
***************************************************************************
Warning: The file extension of 32-bit Windows MEX-files was changed
from ".dll" to ".mexw32" in MATLAB 7.1 (R14SP3). The generated
MEX-file will not be found by MATLAB versions prior to 7.1.
Use the -output option with the ".dll" file extension to
generate a MEX-file that can be called in previous versions.
For more information see:
MATLAB 7.1 Release Notes, New File Extension for MEX-Files on Windows
***************************************************************************


G:\MATLAB\R2007B\BIN\MEX.PL: Error: Link of 'bwblkslv.mexw32' failed.

??? Error using ==> mex at 208
Unable to complete successfully.

Error in ==> install_sedumi at 125
eval( temp );