The only functionality of sips is generating correct IPS32 patches.
No fancy RLE stuff or support for the legacy IPS format.
This is good enough for the intended use case for IPS32 patches in 2019, which is to make Switch exefs patches.
Apart from ipswitch, most other tools either are Windows-only, or generate broken patches, or do not support IPS32.
Build with make, then ./sips ORIGINAL_FILE PATCHED_FILE PATCH_FILE to generate a patch file.