diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,13 @@
 
 Version history.
 
+## 0.0.6 released 2021-07-29
+
+- Fix the release version: The tag `0.0.5` on the GitHub repo was released on 14 Oct 2019 while `0.0.5` on Hackage is the commit `1394ec6`.
+- Include `-Wall` and `-Wcompact` during compilation.
+- Update `stack-x.y.z.yaml` and add `stack-8.10.5.yaml`.
+
 ## 0.0.5 released 2021-03-11
 
-- initial release
-- tested with GHC 8.0.2 - 9.0.1
+- initial release.
+- tested with GHC 8.0.2 - 9.0.1.
diff --git a/FixWhitespace.hs b/FixWhitespace.hs
--- a/FixWhitespace.hs
+++ b/FixWhitespace.hs
@@ -14,8 +14,8 @@
 import System.Directory ( getCurrentDirectory, doesFileExist)
 import System.Environment
 import System.Exit
-import System.FilePath
-import System.FilePattern
+-- import System.FilePath
+-- import System.FilePattern
 import System.FilePattern.Directory
 import System.IO
 import System.Console.GetOpt
@@ -40,6 +40,7 @@
   -- ^ The location to the configuration file.
   }
 
+defaultOptions :: Options
 defaultOptions = Options
   { optVerbose = False
   , optHelp    = False
@@ -214,8 +215,8 @@
                              n = 8 - p `mod` 8
   convertOne (a, p) c = (c:a, p+1)
 
-  addSpaces 0 x = x
-  addSpaces n x = addSpaces (n-1) (' ':x)
+  addSpaces :: Int -> String -> String
+  addSpaces n = (replicate n ' ' ++)
 
 -- | 'dropWhile' except keep the first of the dropped elements
 dropWhile1 :: (a -> Bool) -> [a] -> [a]
diff --git a/ParseConfig.hs b/ParseConfig.hs
--- a/ParseConfig.hs
+++ b/ParseConfig.hs
@@ -32,8 +32,9 @@
     v .:? "excluded-files"
   parseJSON _ = fail "Expected Object for Config value"
 
-parseRawConfig :: FilePath -> IO (Either Y.ParseException RawConfig)
-parseRawConfig = Y.decodeFileEither
+-- -- UNUSED
+-- parseRawConfig :: FilePath -> IO (Either Y.ParseException RawConfig)
+-- parseRawConfig = Y.decodeFileEither
 
 parseConfig :: FilePath -> IO Config
 parseConfig fp = do
diff --git a/fix-whitespace.cabal b/fix-whitespace.cabal
--- a/fix-whitespace.cabal
+++ b/fix-whitespace.cabal
@@ -1,5 +1,5 @@
 name:            fix-whitespace
-version:         0.0.5
+version:         0.0.6
 cabal-version:   >= 1.10
 build-type:      Simple
 description:     Removes trailing whitespace, lines containing only whitespace and ensure that every file ends in a newline character.
@@ -15,14 +15,27 @@
                  GHC == 8.2.2
                  GHC == 8.4.4
                  GHC == 8.6.5
+                 GHC == 8.8.3
                  GHC == 8.8.4
                  GHC == 8.10.3
                  GHC == 8.10.4
+                 GHC == 8.10.5
                  GHC == 9.0.1
 
 extra-source-files:
   CHANGELOG.md
   README.md
+  fix-whitespace.yaml
+  stack-8.0.2.yaml
+  stack-8.2.2.yaml
+  stack-8.4.4.yaml
+  stack-8.6.5.yaml
+  stack-8.8.3.yaml
+  stack-8.8.4.yaml
+  stack-8.10.3.yaml
+  stack-8.10.4.yaml
+  stack-8.10.5.yaml
+  stack-9.0.1.yaml
 
 source-repository head
   type: git
@@ -48,3 +61,7 @@
   -- The other GHC versions can restrict to >= 1.2.3.1.
   if impl(ghc < 8.4.1) || impl(ghc > 8.4.3)
     build-depends: text >= 1.2.3.1
+
+  ghc-options:
+    -Wall
+    -Wcompat
diff --git a/fix-whitespace.yaml b/fix-whitespace.yaml
new file mode 100644
--- /dev/null
+++ b/fix-whitespace.yaml
@@ -0,0 +1,64 @@
+# This file contains the project-specific settings for `fix-whitespace` a tiny
+# but useful tool to
+#
+# * Removes trailing whitespace.
+# * Removes trailing lines containing nothing but whitespace.
+# * Ensures that the file ends in a newline character.
+#
+# By default, fix-whitespace checks every directory under the current working
+# directory but no files. This program should be placed under a text-based
+# project.
+#
+# For directories,
+#
+# 1) excluded-dirs is a black-list of directories,
+# 2) included-dirs is a white-list of excluded-dirs
+#
+# For files,
+#
+# 3) included-files is a white-list of files,
+# 4) excluded-files is a black-list of included-files.
+#
+# The extended glob pattern can be used to specify file/directory names.
+# For details, see http://hackage.haskell.org/package/filemanip-0.3.6.3/docs/System-FilePath-GlobPattern.html
+#
+included-dirs:
+  - src/full/Agda/Compiler/MAlonzo
+    # Without this line the above path will be excluded.
+
+excluded-dirs:
+  - "**/MAlonzo" # matches every MAlonzo in any directory including the src/full/Agda/Compiler/MAlonzo
+  - "**/dist*"   # matches every dist* in any directory
+  - .stack-work
+  - _darcs
+  - .git
+  - std-lib
+  - test/Succeed/LineEndings
+  - examples/uptodate
+
+# Every matched filename is included unless it is matched by excluded-files.
+included-files:
+  - "**/*.agda"
+  - "**/*.cabal"
+  - "**/*.el"
+  - "**/*.hs"
+  - "**/*.hs-boot"
+  - "**/*.lagda"
+  - "**/*.lhs"
+  - "**/*.md"
+  - "**/*.rst"
+  - "**/*.x"
+  - "**/*.y"
+  - "**/*.yaml"
+  - "**/*.yml"
+
+excluded-files:
+# Andreas (24 Sep 2014).
+# The following files are exempt from the whitespace check,
+# as they test behavior of Agda with regard to tab characters.
+  - "test/Succeed/Whitespace.agda"
+  - "test/Succeed/Issue1337.agda"
+  - "test/Fail/Tabs.agda"
+  - "test/Fail/TabsInPragmas.agda"
+  - "src/full/Agda/Syntax/Parser/Lexer.hs"
+  - "test/LaTeXAndHTML/succeed/AccidentalSpacesAfterBeginCode.lagda"
diff --git a/stack-8.0.2.yaml b/stack-8.0.2.yaml
new file mode 100644
--- /dev/null
+++ b/stack-8.0.2.yaml
@@ -0,0 +1,8 @@
+resolver: lts-9.21
+compiler: ghc-8.0.2
+compiler-check: match-exact
+
+extra-deps:
+  - text-1.2.3.1
+  - extra-1.7.1
+  - filepattern-0.1.2
diff --git a/stack-8.10.3.yaml b/stack-8.10.3.yaml
new file mode 100644
--- /dev/null
+++ b/stack-8.10.3.yaml
@@ -0,0 +1,3 @@
+resolver: lts-17.2
+compiler: ghc-8.10.3
+compiler-check: match-exact
diff --git a/stack-8.10.4.yaml b/stack-8.10.4.yaml
new file mode 100644
--- /dev/null
+++ b/stack-8.10.4.yaml
@@ -0,0 +1,3 @@
+resolver: lts-18.4
+compiler: ghc-8.10.4
+compiler-check: match-exact
diff --git a/stack-8.10.5.yaml b/stack-8.10.5.yaml
new file mode 100644
--- /dev/null
+++ b/stack-8.10.5.yaml
@@ -0,0 +1,3 @@
+resolver: lts-18.4
+compiler: ghc-8.10.5
+compiler-check: match-exact
diff --git a/stack-8.2.2.yaml b/stack-8.2.2.yaml
new file mode 100644
--- /dev/null
+++ b/stack-8.2.2.yaml
@@ -0,0 +1,7 @@
+resolver: lts-11.22
+compiler: ghc-8.2.2
+compiler-check: match-exact
+
+extra-deps:
+  - text-1.2.3.1
+  - filepattern-0.1.2
diff --git a/stack-8.4.4.yaml b/stack-8.4.4.yaml
new file mode 100644
--- /dev/null
+++ b/stack-8.4.4.yaml
@@ -0,0 +1,6 @@
+resolver: lts-12.26
+compiler: ghc-8.4.4
+compiler-check: match-exact
+
+extra-deps:
+  - filepattern-0.1.2
diff --git a/stack-8.6.5.yaml b/stack-8.6.5.yaml
new file mode 100644
--- /dev/null
+++ b/stack-8.6.5.yaml
@@ -0,0 +1,6 @@
+resolver: lts-14.27
+compiler: ghc-8.6.5
+compiler-check: match-exact
+
+extra-deps:
+  - filepattern-0.1.2
diff --git a/stack-8.8.3.yaml b/stack-8.8.3.yaml
new file mode 100644
--- /dev/null
+++ b/stack-8.8.3.yaml
@@ -0,0 +1,5 @@
+resolver: lts-16.11
+compiler: ghc-8.8.3
+compiler-check: match-exact
+
+extra-deps:
diff --git a/stack-8.8.4.yaml b/stack-8.8.4.yaml
new file mode 100644
--- /dev/null
+++ b/stack-8.8.4.yaml
@@ -0,0 +1,5 @@
+resolver: lts-16.31
+compiler: ghc-8.8.4
+compiler-check: match-exact
+
+extra-deps:
diff --git a/stack-9.0.1.yaml b/stack-9.0.1.yaml
new file mode 100644
--- /dev/null
+++ b/stack-9.0.1.yaml
@@ -0,0 +1,7 @@
+resolver: nightly-2021-07-29
+compiler: ghc-9.0.1
+compiler-check: match-exact
+
+flags:
+  transformers-compat:
+    five-three: true