diff --git a/Data/Text/ICU/BiDi.hsc b/Data/Text/ICU/BiDi.hsc
index 976a593..d94be7d 100644
--- a/Data/Text/ICU/BiDi.hsc
+++ b/Data/Text/ICU/BiDi.hsc
@@ -45,7 +45,6 @@ import Data.Text.ICU.Error.Internal (UErrorCode, handleError, handleOverflowErro
 import Data.Text (Text)
 import Data.Text.ICU.Internal (UChar, useAsUCharPtr, fromUCharPtr, newICUPtr)
 import Foreign.C.Types (CInt(..))
-import Data.List (foldl')
 import Data.Bits ((.|.))
 import System.IO.Unsafe (unsafePerformIO)
 import Data.Traversable (for)
diff --git a/Data/Text/ICU/Collate.hsc b/Data/Text/ICU/Collate.hsc
index 160e3f6..d70f498 100644
--- a/Data/Text/ICU/Collate.hsc
+++ b/Data/Text/ICU/Collate.hsc
@@ -39,8 +39,7 @@ module Data.Text.ICU.Collate
 
 import Control.DeepSeq (NFData(..))
 import Data.ByteString (empty)
-import Data.ByteString.Internal (ByteString(..), create, mallocByteString,
-                                 memcpy)
+import Data.ByteString.Internal (ByteString(..), create, mallocByteString)
 import Data.Int (Int32)
 import Data.Text (Text)
 import qualified Data.Text as T
@@ -58,7 +57,7 @@ import Foreign.C.String (CString)
 import Foreign.C.Types (CInt(..))
 import Foreign.ForeignPtr (withForeignPtr)
 import Foreign.Marshal.Alloc (alloca)
-import Foreign.Marshal.Utils (with)
+import Foreign.Marshal.Utils (with, copyBytes)
 import Foreign.Ptr (Ptr, nullPtr)
 import Foreign.Storable (peek)
 
@@ -342,7 +341,7 @@ sortKey c t
               _ | i == 0         -> error "Data.Text.ICU.Collate.sortKey: internal error"
                 | i > n          -> loop i
                 | i <= n `div` 2 -> create j $ \p -> withForeignPtr fp $ \op ->
-                                    memcpy p op (fromIntegral i)
+                                      copyBytes p op (fromIntegral i)
                 | otherwise      -> return $! PS fp 0 j
       loop (min (len * 4) 8)
 
diff --git a/Data/Text/ICU/Normalize.hsc b/Data/Text/ICU/Normalize.hsc
index 21c9426..1f6a5a5 100644
--- a/Data/Text/ICU/Normalize.hsc
+++ b/Data/Text/ICU/Normalize.hsc
@@ -48,7 +48,6 @@ import Foreign.C.Types (CInt(..))
 import Foreign.Ptr (Ptr)
 import System.IO.Unsafe (unsafePerformIO)
 import Prelude hiding (compare)
-import Data.List (foldl')
 import Data.Bits ((.|.))
 
 -- $api
diff --git a/Data/Text/ICU/Normalize2.hsc b/Data/Text/ICU/Normalize2.hsc
index 7b437ea..07dbe28 100644
--- a/Data/Text/ICU/Normalize2.hsc
+++ b/Data/Text/ICU/Normalize2.hsc
@@ -45,7 +45,6 @@ import Foreign.C.Types (CInt(..))
 import Foreign.Ptr (Ptr)
 import System.IO.Unsafe (unsafePerformIO)
 import Prelude hiding (compare)
-import Data.List (foldl')
 import Data.Bits ((.|.))
 
 -- $api
diff --git a/Data/Text/ICU/Shape.hsc b/Data/Text/ICU/Shape.hsc
index cfb4f29..89d2bc6 100644
--- a/Data/Text/ICU/Shape.hsc
+++ b/Data/Text/ICU/Shape.hsc
@@ -21,7 +21,6 @@ module Data.Text.ICU.Shape
 
 #include <unicode/ushape.h>
 
-import Data.List (foldl')
 import Data.Text.ICU.Error.Internal (UErrorCode, handleOverflowError)
 import Data.Bits ((.|.))
 import Data.Int (Int32)
diff --git a/Data/Text/ICU/Spoof.hsc b/Data/Text/ICU/Spoof.hsc
index 2e87b50..eb97536 100644
--- a/Data/Text/ICU/Spoof.hsc
+++ b/Data/Text/ICU/Spoof.hsc
@@ -52,7 +52,7 @@ import Control.DeepSeq (NFData(..))
 import Control.Exception (Exception, throwIO, catchJust)
 import Data.Bits ((.&.))
 import Data.ByteString (ByteString)
-import Data.ByteString.Internal (create, memcpy, toForeignPtr)
+import Data.ByteString.Internal (create, toForeignPtr)
 import Data.ByteString.Unsafe (unsafeUseAsCStringLen)
 import Data.Int (Int32)
 import Data.List (intercalate)
@@ -75,7 +75,7 @@ import Data.Text.ICU.Internal (fromUCharPtr)
 import Data.Typeable (Typeable)
 import Data.Word (Word8)
 import Foreign.C.String (CString, peekCString, withCString)
-import Foreign.Marshal.Utils (with)
+import Foreign.Marshal.Utils (with, copyBytes)
 import Foreign.Ptr (Ptr, nullPtr, plusPtr)
 import Foreign.Storable (peek)
 import Foreign.ForeignPtr (withForeignPtr)
@@ -430,7 +430,7 @@ serialize s = withSpoof s $ \sptr ->
   handleOverflowError 0
     (\dptr dlen -> (uspoof_serialize sptr dptr (fromIntegral dlen)))
     (\dptr dlen -> create (fromIntegral dlen) $ \bptr ->
-      memcpy dptr bptr (fromIntegral dlen))
+      copyBytes dptr bptr (fromIntegral dlen))
 
 foreign import ccall unsafe "hs_text_icu.h __hs_uspoof_open" uspoof_open
     :: Ptr UErrorCode -> IO (Ptr USpoof)
diff --git a/cbits/text_icu.c b/cbits/text_icu.c
index ec2f896..f66b093 100644
--- a/cbits/text_icu.c
+++ b/cbits/text_icu.c
@@ -316,7 +316,7 @@ const char *__hs_u_errorName(UErrorCode code)
 }
 
 
-UBiDi* __hs_ubidi_open()
+UBiDi* __hs_ubidi_open(void)
 {
     return ubidi_open();
 }
diff --git a/include/hs_text_icu.h b/include/hs_text_icu.h
index 345977f..6fc3fe0 100644
--- a/include/hs_text_icu.h
+++ b/include/hs_text_icu.h
@@ -143,7 +143,7 @@ int32_t __hs_ucol_getSortKey(const UCollator *coll,
                              uint8_t *result, int32_t resultLength);
 
 /* ubidi.h */
-UBiDi* __hs_ubidi_open();
+UBiDi* __hs_ubidi_open(void);
 UBiDi* __hs_ubidi_openSized(int32_t maxLength, int32_t maxRunCount, UErrorCode *err);
 void    __hs_ubidi_setPara(UBiDi *pBiDi, const UChar *text, int32_t length, UBiDiLevel paraLevel,
                          UErrorCode *pErrorCode);
diff --git a/text-icu.cabal b/text-icu.cabal
index e1c4f8b..78b4e8e 100644
--- a/text-icu.cabal
+++ b/text-icu.cabal
@@ -69,10 +69,16 @@ tested-with:
   GHC == 8.0.2
 
 flag homebrew
-  Description: Assume homebrew on macOS. Automatically add /usr/local/opt/ and /opt/homebrew/opt/ paths to extra-lib-dirs and include-dirs.
+  Description: Homebrew on macOS. Add /usr/local/opt/ and /opt/homebrew/opt/ paths to extra-lib-dirs and include-dirs.
   Default:     True
   Manual:      True
 
+flag macports
+  Description: MacPorts on macOS. (port install icu)
+  Default:     False
+  Manual:      True
+
+  
 library
   default-language:  Haskell98
   build-depends:
@@ -134,6 +140,13 @@ library
     include-dirs:
       /usr/local/opt/icu4c/include
       /opt/homebrew/opt/icu4c/include
+  if os(darwin) && flag(macports)
+    extra-lib-dirs:
+      /opt/local/lib
+    include-dirs:
+      /opt/local/include
+
+
   extra-libraries: icuuc
   if os(mingw32)
     extra-libraries: icuin icudt icuio