git: f55bb91726 - main - [phb][uses] Document erlang

The branch main has been updated by fernape:

URL: https://cgit.FreeBSD.org/doc/commit/?id=f55bb91726b6ad07362bf8aedb6a3aa9d62bd41f

commit f55bb91726b6ad07362bf8aedb6a3aa9d62bd41f
Author:     Fernando Apesteguía <fernape@FreeBSD.org>
AuthorDate: 2022-12-01 07:09:14 +0000
Commit:     Fernando Apesteguía <fernape@FreeBSD.org>
CommitDate: 2022-12-08 17:12:40 +0000

    [phb][uses] Document erlang
    
    Document erlang facilities in the ports framework.
    
    Reviewers: dch@, olgeni@
    Differential Revision: https://reviews.freebsd.org/D37578
---
 .../en/books/porters-handbook/uses/_index.adoc     | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/documentation/content/en/books/porters-handbook/uses/_index.adoc b/documentation/content/en/books/porters-handbook/uses/_index.adoc
index dad36f57b2..cfa218a8b9 100644
--- a/documentation/content/en/books/porters-handbook/uses/_index.adoc
+++ b/documentation/content/en/books/porters-handbook/uses/_index.adoc
@@ -425,6 +425,29 @@ ELF_FEATURES=	featurelist:path/to/file1 \
 
 The format of `featurelist` is described in man:elfctl[1].  The file paths are relative to ${BUILD_WRKSRC}.
 
+[[uses-erlang]]
+== `erlang`
+
+Possible arguments: (none), `enc`, `rebar`, `rebar3`
+
+Adds a build and run time dependency on package:lang/erlang[].
+Depending on the argument, it adds additional build dependencies. `enc` adds a
+dependency on package:devel/erlang-native-compiler[], `rebar` adds a dependency on
+package:devel/rebar[] and `rebar3` adds a dependency on package:devel/rebar3[].
+
+In addition, the following variables are available to the port:
+
+* `ERL_APP_NAME`: Erlang app name as installed in Erlang's lib dir (minus version)
+* `ERL_APP_ROOT`: Root directory for this Erlang app
+* `REBAR_CMD`: Path to the "rebar" command
+* `REBAR3_CMD`: Path to the "rebar3" command
+* `REBAR_PROFILE`: Rebar profile
+* `REBAR_TARGETS`: Rebar target list (usually compile, maybe escriptize)
+* `ERL_BUILD_NAME`: Build name for rebar3
+* `ERL_BUILD_DEPS`: List of BUILD_DEPENDS in category/portname format
+* `ERL_RUN_DEPS`: List of RUN_DEPENDS in category/portname format
+* `ERL_DOCS`: List of documentation files and directories
+
 [[uses-fakeroot]]
 == `fakeroot`