mv code back into src/. Kindly pointed out by Lemmih

configure

@@ -271,7 +271,7 @@ PACKAGE_VERSION=
 PACKAGE_STRING=
 PACKAGE_BUGREPORT=
 
-ac_unique_file="System/Plugins.hs"
+ac_unique_file="src/System/Plugins.hs"
 ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS build build_cpu build_vendor build_os PREFIX TOP GHC GLASGOW_HASKELL HASKELL_SRC TEX TEX2PAGE CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LIBOBJS LTLIBOBJS'
 ac_subst_files=''
 

configure.ac

@@ -8,7 +8,7 @@
 # only AC_DEFINES are visible in Haskell src
 
 # sanity test
-AC_INIT(System/Plugins.hs)
+AC_INIT(src/System/Plugins.hs)
 
 # Prepare to generate the config.h.in file
 AC_CONFIG_HEADERS([config.h])

plugins.cabal

@@ -30,8 +30,9 @@ exposed-modules:
         System.Plugins.Process,
         System.Plugins.Utils
 c-sources:
-        Language/Hi/hschooks.c
+        src/Language/Hi/hschooks.c
 includes:             Linker.h
 extensions:           CPP, ForeignFunctionInterface
 Build-Depends:        base, Cabal, haskell-src
 ghc-options:          -Wall -O -fvia-C -funbox-strict-fields -fno-warn-missing-signatures
+Hs-source-dirs: src

plugins.cabal.hsx

@@ -30,9 +30,9 @@ exposed-modules:
         System.Plugins.Process,
         System.Plugins.Utils
 c-sources:
-        Language/Hi/hschooks.c
+        src/Language/Hi/hschooks.c
 includes:             Linker.h
 extensions:           CPP, ForeignFunctionInterface
 Build-Depends:        base, Cabal, haskell-src-exts
 ghc-options:          -Wall -O -fvia-C -funbox-strict-fields -fno-warn-missing-signatures
-
+Hs-source-dirs: src

src/Language/Hi/Parser.hs

@@ -48,7 +48,7 @@ import Language.Hi.Syntax
 import Language.Hi.Binary
 import Language.Hi.FastString
 
-#include "../../config.h"
+#include "../../../config.h"
 
 -- ---------------------------------------------------------------------------
 -- how to get there from here

src/System/Plugins/Consts.hs

@@ -19,7 +19,7 @@
 
 module System.Plugins.Consts where
 
-#include "../../config.h"
+#include "../../../config.h"
 
 
 #if __GLASGOW_HASKELL__ >= 604

src/System/Plugins/Env.hs

@@ -45,7 +45,7 @@ module System.Plugins.Env (
 
    ) where
 
-#include "../../config.h"
+#include "../../../config.h"
 
 import System.Plugins.LoadTypes (Module)
 import System.Plugins.PackageAPI  {- everything -}

src/System/Plugins/Load.hs

@@ -49,7 +49,7 @@ module System.Plugins.Load (
 
   ) where
 
-#include "../../config.h"
+#include "../../../config.h"
 
 import System.Plugins.Make             ( build )
 import System.Plugins.Env

src/System/Plugins/PackageAPI.hs

@@ -36,7 +36,7 @@ module System.Plugins.PackageAPI (
        , updLibraryDirs 
    ) where
 
-#include "../../config.h"
+#include "../../../config.h"
 
 #if CABAL == 1 || __GLASGOW_HASKELL__ >= 604
 import Distribution.InstalledPackageInfo

src/System/Plugins/Parser.hs

@@ -24,7 +24,7 @@ module System.Plugins.Parser (
         replaceModName
   ) where
 
-#include "../../config.h"
+#include "../../../config.h"
 
 import Data.List 
 import Data.Char

src/System/Plugins/Utils.hs

@@ -56,7 +56,7 @@ module System.Plugins.Utils (
 
   ) where
 
-#include "../../config.h"
+#include "../../../config.h"
 
 import System.Plugins.Env              ( isLoaded )
 import System.Plugins.Consts           ( objSuf, hiSuf, tmpDir )