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--- README.md
+++ README.md
$ emacs FICS/config.h
+### Utility functions from BSD systems ###
+
+Utility functions from BSD systems are used for the FICS. Which means
+on for example a
+[Debian GNU/Linux](https://www.debian.org/)
+system you need to install the following package before running make:
+
+ # apt install libbsd-dev
+
From the top-level directory of the cloned Git repository begin the
building by running make.