Assuming (because you have not told us) that you have a stepper driver that takes step and direction signals then it is easy to write your own code to operate the motor without any library.
Have a look at this Simple Stepper Code
And for "roll-your-own" acceleration have a look at this (Reply #7)
It would probably also be a good idea to use the digitalWriteFast library for that bit of extra performance.
...R