From: Peter Lemenkov <lemenkov@gmail.com>
Date: Tue, 5 Jun 2012 15:10:12 +0400
Subject: [PATCH] Allow discarding building ports

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>

Conflicts:
	src/rebar_port_compiler.erl

diff --git a/src/rebar_port_compiler.erl b/src/rebar_port_compiler.erl
index 9679c80..0ba9e84 100644
--- a/src/rebar_port_compiler.erl
+++ b/src/rebar_port_compiler.erl
@@ -348,6 +348,12 @@ get_specs(Config, AppFile) ->
                     %% No spec provided. Construct a spec
                     %% from old-school so_name and sources
                     [port_spec_from_legacy(Config, AppFile)];
+                [{null,[]}] ->
+                    [];
+                [null] ->
+                    [];
+                [skip] ->
+                    [];
                 PortSpecs ->
                     Filtered = filter_port_specs(PortSpecs),
                     OsType = os:type(),