C89 incompatibility 

The **README** says that the code is written in a _'C89 style'_, but there's a lot of issues when trying to compile with _'-std=c89 -pedantic'_ in gcc. Also, 64-bits integer are not guaranteed to exist in C89 nor fixed width types (i.e. uint32_t, uint64_t).

How can I port the code to a C89 only compiler?