Add WITHOUT variable to exclude components on build

This allows to ignore lines from the default build.config if needed.
For example to not include packages run make WITHOUT=index

2 files changed, 18 insertions, 0 deletions

diff --git a/doc/src/guide/getting_started.asciidoc b/doc/src/guide/getting_started.asciidoc
index ca1391d..5d7d804 100644
--- a/doc/src/guide/getting_started.asciidoc
+++ b/doc/src/guide/getting_started.asciidoc
@@ -78,6 +78,17 @@ to bootstrap. This operation is done only once. Consult the
 xref:updating[Updating Erlang.mk] chapter for more
 information.
 
+[NOTE]
+----
+By default the file contains a package index. To filter it, run the command
+above with the `WITHOUT=index` argument.
+
+[source,bash]
+$ make -f erlang.mk bootstrap WITHOUT=index
+
+This command will generate the file without the index.
+----
+
 Of course, the generated project can now be compiled:
 
 [source,bash]
diff --git a/doc/src/guide/updating.asciidoc b/doc/src/guide/updating.asciidoc
index 61d913d..3c72749 100644
--- a/doc/src/guide/updating.asciidoc
+++ b/doc/src/guide/updating.asciidoc
@@ -61,3 +61,10 @@ You can also name the file differently or put it in a separate folder
 by modifying the value for `ERLANG_MK_BUILD_CONFIG`. You can also
 tell Erlang.mk to use a different temporary directory by changing
 the `ERLANG_MK_BUILD_DIR` variable.
+
+Alternatively you can filter out a plugin in the build config by using the
+`WITHOUT` variable the first time you generate the file. For example this
+commande will filter the index plugin:
+
+[source,bash]
+$ make -f erlang.mk WITHOUT=index