Install libasr-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libasr-dev
Description:
asynchronous DNS resolver (development files)
libasr provides a simple interface for asynchronous address resolution and nameserver querying. It should be used in place of the classical resolver functions of libc when blocking is not desirable. libasr is thread-safe and lock-free internally except for the two atypical use cases listed in asr_run(3). . This package provides the development files for libasr0.
Homepage: https://github.com/OpenSMTPD/libasr
Version: 1.0.2-1
Section: universe/libdevel