+@vindex PREFIX
+@vindex DESTDIR
+@vindex GO
+@vindex MAKEINFO
+@vindex PLANTUML
+@vindex PREFIX
+@vindex SENDMAIL
+@vindex CFGPATH
+@vindex SPOOLPATH
+@vindex LOGPATH
+@vindex BINDIR
+@vindex INFODIR
+@vindex DOCDIR
+@file{config} file contains some environment variables that are
+respected during installation:
+@env{$PREFIX},
+@env{$DESTDIR},
+@env{$GO},
+@env{$MAKEINFO},
+@env{$PLANTUML},
+@env{$PREFIX},
+@env{$SENDMAIL},
+@env{$CFGPATH},
+@env{$SPOOLPATH},
+@env{$LOGPATH},
+@env{$BINDIR},
+@env{$INFODIR},
+@env{$DOCDIR}.
+
+There is @command{install} script for binaries and info-documentation
+installation:
+
+@example
+# PREFIX=/usr/local ./install
+@end example
+
+@vindex nofsnotify
+@cindex kqueue
+@cindex epoll
+@vindex GO_CFLAGS
+NNCP depends on @code{github.com/fsnotify/fsnotify} library, that solely
+relies on OS-specific mechanisms. There is possibility that you have
+either broken or unsupported ones. You can still build NNCP with
+@code{-tags nofsnotify} build option, to skip @code{fsnotify} library
+usage at all:
+
+@example
+$ GO_CFLAGS="-tags nofsnotify" bin/build
+@end example
+
+@vindex noyggdrasil
+You can also disable Yggdrasil support with @code{-tags noyggdrasil}.