Compiling error on ssize_t

Hi,

I'm rookie on the Labwindow cvi. Just followed through the traning material "Getting Started".

Almost completed chaper 3  and encountered an error on c source codes.

c surce code

   SinePattern (100, amp, 180.0, 2.0, sine);

Build output window shows

 sample2.c - 1 error
  86, 25    error: called object type 'ssize_t' (aka 'int') is not a function or function pointer

Have changed either " ssize_t" or " size_t" but still  having debugging error.

Need advice here.

Many thanks.