Qcint is a branch of libcint library. It provides exactly the same APIs as libcint. However, the code is optimized against SSE3 instructions. On x86_64 platform, qcint can be 5 ~ 50% faster than libcint. Please refer to libcint for more details of the features and installation instructions.
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/talcite/qcint/