Instruction uses all of its entries.

src/instructions.cr

@@ -26,14 +26,15 @@ class Package::Instructions
 
 		def run(context : Context, recipe : Recipe) : BuildStatus
 			if size > 0
-				# FIXME: Maybe do that for [1] and the others, no?
-				child = context.run recipe.building_directory, "sh", ["-c", self[0]]
+				each do |command|
+					child = context.run recipe.building_directory, "sh", ["-c", command]
 
-				if child.exit_status == 0
-					return BuildStatus::Success
-				else
-					return BuildStatus::Failed
+					if child.exit_status != 0
+						return BuildStatus::Failed
+					end
 				end
+
+				return BuildStatus::Success
 			end
 
 			context.building_backends.select(&.phase.==(@phase)).each do |backend|