Run/Build dependencies split.

src/package.cr

@@ -25,7 +25,7 @@ class Package::Package
 	inherit url          : String?
 	inherit description  : String
 
-	inherit dependencies : Array(String)
+	setter  dependencies : Array(String)?
 	inherit conflicts    : Array(String)
 	inherit provides     : Array(String)
 
@@ -35,6 +35,10 @@ class Package::Package
 
 	@fake_root_directory : String?
 
+	def dependencies
+		@dependencies || @recipe.run_dependencies
+	end
+
 	def fake_root_directory
 		@fake_root_directory || "#{recipe.working_directory}/root-#{name}"
 	end

src/recipe.cr

@@ -101,7 +101,8 @@ class Package::Recipe
 
 	# Relations to other packages.
 	# FIXME: `dependencies` needs splitting between run-time and build-time.
-	getter dependencies  = Array(String).new
+	getter run_dependencies   = Array(String).new
+	getter build_dependencies = Array(String).new
 	getter provides      = Array(String).new
 	getter conflicts     = Array(String).new
 
@@ -164,7 +165,16 @@ class Package::Recipe
 				@instructions.install << value.as_s_or_ls
 			when "dependencies"
 				value.as_a_or_s.each do |atom|
-					@dependencies << atom
+					@run_dependencies << atom
+					@build_dependencies << atom
+				end
+			when "build-dependencies"
+				value.as_a_or_s.each do |atom|
+					@build_dependencies << atom
+				end
+			when "run-dependencies"
+				value.as_a_or_s.each do |atom|
+					@run_dependencies << atom
 				end
 			when "conflicts"
 				value.as_a_or_s.each do |atom|