An error about "sizeof(IppsSHA1State)"

Hi all,

I installed Intel® Integrated Performance Primitives Cryptography for Linux* Version Version 2017 (Update 3),and when I use "sizeof(IppsSHA1State)" in my C code, I got some errors like "error: invalid application of ‘sizeof’ to incomplete type ‘IppsSHA1State'" and "error: dereferencing pointer to incomplete type". 

So,how to solve these errors?

Thanks,

Liu