This exe runs perfectly on my machine but not on another machine and gives the error of cygwin1.dll required.

Yes, you said that in your original posting, and I provided the answer already (-x -l depends ... the links)

This simply appears that to run on Windows, I need to use pp using strawberry or ActivePerl. To run on cygwin, I need to build it on cygwin perl. And finally to run on unix machine, I need to build it on unix machine. Please correct me if I am wrong.

Well, cygwin is not windows, the end :)

You , can call cygwin programs from windows, even a pp-ed perl program ... but kinda misses the point of windows and of cygwin, and complicates your perl programs ... why surprise windows people with an unixish cygwin perl program ?

Have a nice day