diff --git a/patches/Unixutils-1.54.1.patch b/patches/Unixutils-1.54.1.patch
deleted file mode 100644
index 8e4f8011f81a306cdf9b4ef95384a80f18067cd7..0000000000000000000000000000000000000000
--- a/patches/Unixutils-1.54.1.patch
+++ /dev/null
@@ -1,23 +0,0 @@
-diff --git a/System/Unix/Chroot.hs b/System/Unix/Chroot.hs
-index 06bf3dd..12de580 100644
---- a/System/Unix/Chroot.hs
-+++ b/System/Unix/Chroot.hs
-@@ -1,4 +1,4 @@
--{-# LANGUAGE ForeignFunctionInterface #-}
-+{-# LANGUAGE CPP, ForeignFunctionInterface #-}
- -- | This module, except for useEnv, is copied from the build-env package.
- module System.Unix.Chroot
- ( fchroot
-@@ -45,7 +45,11 @@ chroot fp = withCString fp $ \cfp -> throwErrnoIfMinus1_ "chroot" (c_chroot cfp)
- fchroot :: (MonadIO m, MonadMask m) => FilePath -> m a -> m a
- fchroot path action =
- do origWd <- liftIO $ getWorkingDirectory
-- rootFd <- liftIO $ openFd "/" ReadOnly Nothing defaultFileFlags
-+ rootFd <- liftIO $ openFd "/" ReadOnly
-+#if !(MIN_VERSION_unix(2,8,0))
-+ Nothing
-+#endif
-+ defaultFileFlags
- liftIO $ chroot path
- liftIO $ changeWorkingDirectory "/"
- action `finally` (liftIO $ breakFree origWd rootFd)
diff --git a/patches/bytestring-mmap-0.2.2.patch b/patches/bytestring-mmap-0.2.2.patch
deleted file mode 100644
index 50f12c7d38c55325a4326b0dda435705f24f719f..0000000000000000000000000000000000000000
--- a/patches/bytestring-mmap-0.2.2.patch
+++ /dev/null
@@ -1,40 +0,0 @@
-diff --git a/System/IO/Posix/MMap.hs b/System/IO/Posix/MMap.hs
-index adf71e2..3525c84 100644
---- a/System/IO/Posix/MMap.hs
-+++ b/System/IO/Posix/MMap.hs
-@@ -1,4 +1,4 @@
--{-# LANGUAGE ForeignFunctionInterface #-}
-+{-# LANGUAGE CPP, ForeignFunctionInterface #-}
- --------------------------------------------------------------------
- -- |
- -- Module : System.IO.Posix.MMap
-@@ -98,7 +98,11 @@ import System.Posix
- --
- unsafeMMapFile :: FilePath -> IO ByteString
- unsafeMMapFile f = do
-- fd <- openFd f ReadOnly Nothing defaultFileFlags
-+ fd <- openFd f ReadOnly
-+#if !(MIN_VERSION_unix(2,8,0))
-+ Nothing
-+#endif
-+ defaultFileFlags
- always (closeFd fd) $ do
- stat <- getFdStatus fd
- let size = fromIntegral (fileSize stat)
-diff --git a/System/IO/Posix/MMap/Lazy.hs b/System/IO/Posix/MMap/Lazy.hs
-index 16c9539..ffb7535 100644
---- a/System/IO/Posix/MMap/Lazy.hs
-+++ b/System/IO/Posix/MMap/Lazy.hs
-@@ -91,7 +91,11 @@ import System.Posix
- --
- unsafeMMapFile :: FilePath -> IO ByteString
- unsafeMMapFile path = do
-- fd <- openFd path ReadOnly Nothing defaultFileFlags
-+ fd <- openFd path ReadOnly
-+#if !(MIN_VERSION_unix(2,8,0))
-+ Nothing
-+#endif
-+ defaultFileFlags
- always (closeFd fd) $ do
- stat <- getFdStatus fd
- let size = fromIntegral (fileSize stat)
diff --git a/patches/crypto-random-0.0.9.patch b/patches/crypto-random-0.0.9.patch
deleted file mode 100644
index 5c4c7554af243c9484a90b557a250da495995b0b..0000000000000000000000000000000000000000
--- a/patches/crypto-random-0.0.9.patch
+++ /dev/null
@@ -1,38 +0,0 @@
-diff --git a/Crypto/Random/Entropy/Unix.hs b/Crypto/Random/Entropy/Unix.hs
-index 42e7d8c..7777952 100644
---- a/Crypto/Random/Entropy/Unix.hs
-+++ b/Crypto/Random/Entropy/Unix.hs
-@@ -5,6 +5,7 @@
- -- Stability : experimental
- -- Portability : Good
- --
-+{-# LANGUAGE CPP #-}
- {-# LANGUAGE ScopedTypeVariables #-}
- module Crypto.Random.Entropy.Unix
- ( DevRandom
-@@ -22,10 +23,10 @@ import System.Posix.IO
- type H = Fd
- type DeviceName = String
-
---- | Entropy device /dev/random on unix system
-+-- | Entropy device /dev/random on unix system
- newtype DevRandom = DevRandom DeviceName
-
---- | Entropy device /dev/urandom on unix system
-+-- | Entropy device /dev/urandom on unix system
- newtype DevURandom = DevURandom DeviceName
-
- instance EntropySource DevRandom where
-@@ -48,7 +49,11 @@ testOpen filepath = do
- Just h -> closeDev h >> return (Just filepath)
-
- openDev :: String -> IO (Maybe H)
--openDev filepath = (Just `fmap` openFd filepath ReadOnly Nothing fileFlags)
-+openDev filepath = (Just `fmap` openFd filepath ReadOnly
-+#if !(MIN_VERSION_unix(2,8,0))
-+ Nothing
-+#endif
-+ fileFlags)
- `E.catch` \(_ :: IOException) -> return Nothing
- where fileFlags = defaultFileFlags { nonBlock = True }
-
diff --git a/patches/filelock-0.1.1.3.patch b/patches/filelock-0.1.1.3.patch
deleted file mode 100644
index bb991250eb55edc7a6ea741a46016c4018548833..0000000000000000000000000000000000000000
--- a/patches/filelock-0.1.1.3.patch
+++ /dev/null
@@ -1,31 +0,0 @@
-diff --git a/System/FileLock/Internal/Flock.hsc b/System/FileLock/Internal/Flock.hsc
-index 317d755..1ed42ef 100644
---- a/System/FileLock/Internal/Flock.hsc
-+++ b/System/FileLock/Internal/Flock.hsc
-@@ -12,7 +12,11 @@ import Data.Bits
- import Foreign.C.Error
- import Foreign.C.Types
- import System.Posix.Files
--import System.Posix.IO (openFd, closeFd, defaultFileFlags, OpenMode(..), setFdOption, FdOption(..))
-+import System.Posix.IO ( openFd, closeFd, defaultFileFlags, OpenMode(..), setFdOption, FdOption(..)
-+#if MIN_VERSION_unix(2,8,0)
-+ , creat
-+#endif
-+ )
- import System.Posix.Types
- import Prelude
-
-@@ -39,7 +43,12 @@ unlock fd = closeFd fd
-
- open :: FilePath -> IO Fd
- open path = do
-- fd <- openFd path WriteOnly (Just stdFileMode) defaultFileFlags
-+ fd <- openFd path WriteOnly
-+#if MIN_VERSION_unix(2,8,0)
-+ (defaultFileFlags {creat = Just stdFileMode})
-+#else
-+ (Just stdFileMode) defaultFileFlags
-+#endif
- -- Ideally, we would open the file descriptor with CLOEXEC enabled, but since
- -- unix 2.8 hasn't been released yet and we want backwards compatibility with
- -- older releases, we set CLOEXEC after opening the file descriptor. This