if strcmp(computer,'PCWIN')  mex RT_rand.c randlib.c com.c linpack.celse %choose your own compiler flags for gnu -O2 is conservative but it will work...  mex RT_rand.c randlib.c com.c linpack.c CFLAGS='$CFLAGS -Wall -O2'  %aggressive compilation by Intel ICC compiler on Linux worked as well (30% faster)  % Pentium 3 and standard IA32  mex /opt/intel/compiler60/ia32/lib/*.a RT_rand.c randlib.c com.c linpack.c CC='icc' LD='gcc' CFLAGS='-parallel' COPTIMFLAGS='-ip -axK -O3'  % Pentium 4  %mex /opt/intel/compiler60/ia32/lib/*.a RT_rand.c randlib.c com.c linpack.c CC='icc' LD='gcc' CFLAGS='-parallel' ...  %    COPTIMFLAGS='-ip -xW -O3 -align -tpp7'end