linking FORTRAN and MATLAB (fengdemo.F)

I have read a lot about the issue of fengdemo.F but I am still stuck in it. I use Linux 64 bites,bash, MATLAB R2013b,and gcc 4.7(they are compatible!) I have set DL_LIBRARY_PATH and also PATH variables correctly in bash. I could compile engdemo.c using mex function in matlab successfully but however much I try to compile the fortran version(fengdemo.F)I get the error "Unclassifiable statement" referring to mwPointer and mwSize. what is the problem? based on what I found in this site, I changed mwPointer to mwpointer(uppercase P to lower case one!!!) and also mwSize to integer*8 . it was compiled successfully without error, even though I dont like this chaotic and irrational trick/solution!!! anyway, when I tried to execute the application(after the chaotic trick) I get segmentation error! is there anyone to explain to me what the problem is. I hope that someone solves this issue fundamentally and comprehensively. please help me...