From 58b19ed495477727d6f38fbbda35402430c94dc2 Mon Sep 17 00:00:00 2001
From: Max Howell <max@methylblue.com>
Date: Sun, 28 Feb 2010 23:40:26 +0000
Subject: [PATCH] Error out if `brew diy` doesn't know the build system

---
 Library/Homebrew/brew.h.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/brew.h.rb b/Library/Homebrew/brew.h.rb
index d4c342dcdf..72472228d6 100644
--- a/Library/Homebrew/brew.h.rb
+++ b/Library/Homebrew/brew.h.rb
@@ -301,7 +301,7 @@ def diy
     version=ARGV.next
   else
     version=path.version
-    raise "Couldn't determine version, try --set-version" if version.nil? or version.empty?
+    raise "Couldn't determine version, try --set-version" if version.to_s.empty?
   end
   
   if ARGV.include? '--set-name'
@@ -321,6 +321,8 @@ def diy
     "-DCMAKE_INSTALL_PREFIX=#{prefix}"
   elsif File.file? 'Makefile.am'
     "--prefix=#{prefix}"
+  else
+    raise "Couldn't determine build system"
   end
 end