diff --git a/make-pages/Depend.hs b/make-pages/Depend.hs
new file mode 100644
index 0000000..91b0fe0
--- /dev/null
+++ b/make-pages/Depend.hs
@@ -0,0 +1,43 @@
+module Depend where
+
+import Info hiding (Text)
+import Data.Foldable
+import System.FilePath
+import Data.Text.Lazy (Text)
+import Data.Text.Lazy.Builder (toLazyText)
+import BuildVar
+
+
+dependSingle' :: FilePath -- ^ yaml file name (relative to data dir!)
+              -> Info
+              -> FilePath -- ^ build dir
+              -> Bool     -- ^ include nsfw?
+              -> Text
+dependSingle' yaml info build nsfw =
+  let dir    = build </> takeDirectory yaml
+      images = if nsfw then #images info else filter #sfw $ #images info
+      paths  = map #path images
+      index  = dir </> "index.html"
+      deps   = map (dir </>) $
+               thumbFile (thumbnail info) : map pageFile paths ++ paths
+      deps'  = unwords deps
+  in
+  toLazyText [b|$@index: $@deps'|]
+
+
+thumbnail :: Info -> FilePath
+thumbnail (Info {thumb = Just t}) = t
+thumbnail (Info {images})
+  | Just i <- find #sfw images = #path i
+  | otherwise                  = error "no thumbnail or sfw images"
+
+addSuffix :: String -> FilePath -> FilePath
+addSuffix suf path =
+  let (pre, ext) = splitExtension path in
+  pre ++ suf ++ ext
+
+thumbFile :: FilePath -> FilePath
+thumbFile = addSuffix "_small"
+
+pageFile :: FilePath -> FilePath
+pageFile = addSuffix "_med"
diff --git a/make-pages/Main.hs b/make-pages/Main.hs
index f85cf16..b1e1bc4 100644
--- a/make-pages/Main.hs
+++ b/make-pages/Main.hs
@@ -4,13 +4,16 @@ module Main (main) where
 import qualified Data.ByteString.Lazy as ByteString
 import Data.ByteString.Lazy (ByteString)
 import qualified Data.YAML as YAML
+import Data.Text.Lazy (Text)
 import qualified Data.Text.Lazy.IO as Text
 import qualified Options.Applicative as Opt
 import System.IO (hPutStrLn, stderr)
+import System.FilePath (makeRelative)
 import Text.Printf (printf)
 import Control.Applicative
 import Control.Monad
 import SinglePage
+import Depend
 
 #ifdef PRETTY_VERBOSE
 import Text.Show.Pretty (ppShow)
@@ -34,6 +37,13 @@ data ModeOptions =
       nsfw   :: Bool,
       output :: Maybe FilePath
     }
+  | DependSingle {
+      file     :: FilePath,
+      nsfw     :: Bool,
+      output   :: Maybe FilePath,
+      buildDir :: FilePath,
+      dataDir  :: FilePath
+    }
   deriving Show
 
 optionsParser :: Opt.ParserInfo Options
@@ -42,30 +52,43 @@ optionsParser = globalOpts `Opt.info` mainInfo where
   verboseOpt = Opt.switch $
     Opt.short 'v' <> Opt.long "verbose" <>
     Opt.help "print extra stuff to stderr"
-  subcommands = Opt.hsubparser (single <> gallery)
+  subcommands = Opt.hsubparser $
+    single <> gallery <> dependSingle
 
   single = Opt.command "single" $ singleOpts `Opt.info` singleInfo
-  singleOpts = SinglePage <$> fileArg <*> nsfwSwitchS <*> outputOpt
-  fileArg = Opt.strArgument $
+  singleOpts = SinglePage <$> file <*> nsfwS <*> output
+  file = Opt.strArgument $
     Opt.metavar "FILE" <> Opt.help "yaml file to read"
-  nsfwSwitchS = Opt.switch $
+  nsfwS = Opt.switch $
     Opt.short 'n' <> Opt.long "nsfw" <>
     Opt.help "include nsfw versions"
-  outputOpt = Opt.option (Just <$> Opt.str) $
+  output = Opt.option (Just <$> Opt.str) $
     Opt.short 'o' <> Opt.long "output" <> Opt.metavar "FILE" <>
     Opt.value Nothing <>
     Opt.help "output file (default: stdout)"
   singleInfo = Opt.progDesc "generate a page for a single work"
 
   gallery = Opt.command "gallery" $ galleryOpts `Opt.info` galleryInfo
-  galleryOpts = GalleryPage <$> filesArg <*> nsfwSwitchG <*> outputOpt
-  filesArg = many $ Opt.strArgument $
+  galleryOpts = GalleryPage <$> files <*> nsfwG <*> output
+  files = many $ Opt.strArgument $
     Opt.metavar "FILE..." <> Opt.help "yaml files to read"
-  nsfwSwitchG = Opt.switch $
+  nsfwG = Opt.switch $
     Opt.short 'n' <> Opt.long "nsfw" <>
-    Opt.help "include works with only nsfw versions"
+    Opt.help "include works with no sfw versions"
   galleryInfo = Opt.progDesc "generate a gallery page"
 
+  dependSingle = Opt.command "depend-single" $ dsOpts `Opt.info` dsInfo
+  dsOpts = DependSingle <$> file <*> nsfwS <*> output <*> buildDir <*> dataDir
+  buildDir = Opt.strOption $
+    Opt.short 'B' <> Opt.long "build-dir" <> Opt.metavar "DIR" <>
+    Opt.value "_build" <>
+    Opt.help "build directory (default: _build)"
+  dataDir = Opt.strOption $
+    Opt.short 'D' <> Opt.long "data-dir" <> Opt.metavar "DIR" <>
+    Opt.value "data" <>
+    Opt.help "data directory (default: data)"
+  dsInfo = Opt.progDesc "generate makefile dependencies for a single page"
+
   mainInfo = Opt.progDesc "static gallery site generator" <> Opt.fullDesc
 
 
@@ -80,13 +103,19 @@ main2 opts@(Options {mode = SinglePage {file, nsfw, output}}) = do
   info <- readYAML file
   printV opts $ "contents" :- info
   let page = make nsfw info
-  case output of
-    Nothing  -> Text.putStr page
-    Just out -> Text.writeFile out page
+  writeOutput output page
 
 main2 (Options {mode = GalleryPage {}}) = do
   error "surprise! this doesn't exist yet"
 
+main2 opts@(Options
+    {mode = DependSingle {file, nsfw, output, buildDir, dataDir}}) = do
+  info <- readYAML file
+  printV opts $ "contents" :- info
+  let path = makeRelative dataDir file
+  printV opts $ "path" :- path
+  let deps = dependSingle' path info buildDir nsfw
+  writeOutput output deps
 
 
 printV :: Show a => Options -> a -> IO ()
diff --git a/make-pages/make-pages.cabal b/make-pages/make-pages.cabal
index 27e6dd6..a82cbb6 100644
--- a/make-pages/make-pages.cabal
+++ b/make-pages/make-pages.cabal
@@ -13,7 +13,12 @@ flag pretty-verbose
 executable make-pages
   hs-source-dirs: .
   main-is: Main.hs
-  other-modules: Info, SinglePage, BuildVar, Records
+  other-modules:
+    Records,
+    BuildVar,
+    Info,
+    SinglePage,
+    Depend
   default-language: Haskell2010
   default-extensions:
     BlockArguments,
@@ -35,6 +40,7 @@ executable make-pages
     bytestring           ^>= 0.10.8.2,
     containers           ^>= 0.6.0.1,
     directory            ^>= 1.3.6.0,
+    filepath             ^>= 1.4.2.1,
     HsYAML               ^>= 0.2.1.0,
     optparse-applicative ^>= 0.15.1.0,
     template-haskell     ^>= 2.16.0.0,