+# _<name>_SUBDIRS_<dir> Subdirs under <dir>
+# _<name>_DISTLABEL Preprocessor label
+#
+# DISTRBUTIONS=<distributions>
+#
+# The _SUBDIRS define all the subdirectories that the Makefile should
+# traverse. The _SUBDIRS_<dir> defines all subdirectories in the
+# subdirectory <dir>. The _DISTLABEL defines a preprocessor label
+# that can be used in the source code like `#ifdef SILC_DIST_CLIENT' to
+# define code only for the specific distribution. The label can also be
+# used in the Makefiles by `if SILC_DIST_CLIENT' to define something in
+# the Makefile only for the specific distribution.
+#
+# The DISTRIBUTIONS defines all distributions in this file.