add c source to include dir

haskell-igraph.cabal

@@ -69,8 +69,7 @@ library
   hs-source-dirs:      src
   default-language:    Haskell2010
   build-tools:         c2hs >=0.25.0
-  C-Sources:
-    cbits/haskelligraph.c
+  include-dirs:        include
 
 test-suite tests
   type: exitcode-stdio-1.0

src/IGraph/Internal/Arpack.chs

@@ -5,7 +5,7 @@ import Control.Monad
 import Foreign
 import Foreign.C.Types
 
-#include "cbits/haskelligraph.c"
+#include "haskelligraph.h"
 
 {#pointer *igraph_arpack_options_t as ArpackOptPtr foreign finalizer igraph_arpack_destroy newtype#}
 

src/IGraph/Internal/Clique.chs

@@ -10,7 +10,7 @@ import Foreign.C.Types
 {#import IGraph.Internal.Graph #}
 {#import IGraph.Internal.Data #}
 
-#include "cbits/haskelligraph.c"
+#include "haskelligraph.h"
 
 {#fun igraph_cliques as ^ { `IGraphPtr', `VectorPPtr', `Int', `Int' } -> `Int' #}
 

src/IGraph/Internal/Community.chs

@@ -9,7 +9,7 @@ import Foreign.C.Types
 {#import IGraph.Internal.Data #}
 {#import IGraph.Internal.Constants #}
 
-#include "cbits/haskelligraph.c"
+#include "haskelligraph.h"
 
 {#fun igraph_community_spinglass as ^
 { `IGraphPtr'

src/IGraph/Internal/Constants.chs

@@ -3,7 +3,7 @@ module IGraph.Internal.Constants where
 
 import Foreign
 
-#include "cbits/haskelligraph.c"
+#include "haskelligraph.h"
 
 {#enum igraph_neimode_t as Neimode {underscoreToCase}
     deriving (Show, Eq) #}

src/IGraph/Internal/Data.chs

@@ -10,7 +10,7 @@ import System.IO.Unsafe (unsafePerformIO)
 import Data.List (transpose)
 import Data.List.Split (chunksOf)
 
-#include "cbits/haskelligraph.c"
+#include "haskelligraph.h"
 
 {#pointer *igraph_vector_t as VectorPtr foreign finalizer igraph_vector_destroy newtype#}
 

src/IGraph/Internal/Graph.chs

@@ -10,7 +10,7 @@ import System.IO.Unsafe (unsafePerformIO)
 {#import IGraph.Internal.Data #}
 {#import IGraph.Internal.Constants #}
 
-#include "cbits/haskelligraph.c"
+#include "haskelligraph.h"
 
 {#pointer *igraph_t as IGraphPtr foreign finalizer igraph_destroy newtype#}
 

src/IGraph/Internal/Initialization.chs

 {-# LANGUAGE ForeignFunctionInterface #-}
 module IGraph.Internal.Initialization where
 
-#include "cbits/haskelligraph.c"
+#include "haskelligraph.h"
 
 data HasInit