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I just went through this on our sgi o2s...things still seem slow, but here is what I learned: 1) Do NOT modify the file /usr/local/matlabr12/bin/mexopts.sh (well, ours is at the default path specified above...yours may be somewhere else) 2) DO modify spm_MAKE.sh (in your spm99 directory)so that the sgi section of the script is changed as follows: CC="cc -mips2 -O" becomes CC="cc" The reason for these differences is that while the old matlab 5.x on the sgi expects to use the old 32 bit libraries for compilation (requiring changes to mexopts but not the spm_MAKE.sh file), the new matlab uses the new libraries, so that the changes I recommend above in 1 and 2 seem to work. Additionally, when you start matlab, do so without the gui interface to save on overhead >matlab -nojvm This change was recommended by Kazuhisa Niki, and we have found that it improves performance. I must say that we could stand continued performance improvement, if anyone has any ideas...but this is helping for now. Let me know if this works for you. Dianne Patterson -- Original Message -- >Hi, > >Any suggestions with regards to compiling the SPM99 mexsg files on SGI IRIX >6.5 (R10000 processor) running Matlab6.0. > >Generating them with the make file provided gives an error saying that these >mexsg files cannot be loaded and talks of unresolvable symbols in these >mexsg files. > >Of course if anyone has these files already available it would terrific. > >Thanks.....Raj >