Hi Bob, I'm wondering if intmax_t and uintmax_t from stdint.h could be used here. According to comments in inttypes.h PRIdMAX is written around those. Then stdint.h is doing the heavy lifting for platform portability. Or is the intent to work prior to C99? This worked in the ARM environment... diff --git a/include/headers.h b/include/headers.h index 7e43b44..666df8b 100644 --- a/include/headers.h +++ b/include/headers.h @@ -211,13 +211,8 @@ typedef long long max_size_t; typedef unsigned long long...