MATLAB options file in Linux 64

Happy new year 2014,
I am writing this blog to notice you a trick to change option files in Matlab in Linux, which is very useful. When you want to use MEX to compile a C/Fortran source in MEX interface, you need to modify option files mexopts.sh in Linux because the default file contains errors in Linux. Why is it important so? The answer is that options files control which compiler to use, the compiler and link command options, and the runtime libraries to link against.
Then, where the file locate in Linux? The default file mexopts.sh locates in /home/tranlaman/.matlab/R2012a. But there is another default root file lie in /home/tranlaman/MATLAB/R2012a/bin which overrides the file in /home/tranlaman/.matlab/R2012a. So, modifying the mexopts.sh in /home/tranlaman/MATLAB/R2012a/bin would change everything.
Finally, how do we modify this file? The answer is to change some compiling and linking flag such as CC, CFLAGS, CLIBS, LD, LDFLAGS. Please refer to [1] as a complete flag for custom building MEX files.
Wish everyone has a good year.