Rank regression --> help!

I am trying to do a multiple linear regression for a dependent variable Y,with different independent variables X1, X2, X3, etc.

I need to use non-parametric multiple regression, as one of my IV, X1, is very skewed and transformation wouldn't help.

I was suggested to use Rank regression. And I have minitab and SPSS as available software. But both seem to not have that option. What other software would you guys recommend? Also, is there anyway to do a rank regression with minitab or SPSS to do a multiple regression?

Thanks in advance!!!