diff --git a/.github/workflows/hlint-from-scratch.yml b/.github/workflows/hlint-from-scratch.yml
index ade04f7..20a3574 100644
--- a/.github/workflows/hlint-from-scratch.yml
+++ b/.github/workflows/hlint-from-scratch.yml
@@ -13,12 +13,15 @@ jobs:
         os: [ubuntu, macos, windows]
     steps:
       - uses: actions/checkout@v4
-      - run: stack upgrade
       - run: brew install automake
         if: matrix.os == 'macos'
+      - run: cabal update
+      # - run: cabal new-install cabal-install --overwrite-policy=always
+      - run: cabal new-install apply-refact
+        if: matrix.os == 'ubuntu'
       - run: |-
           echo "GHCLIB_AZURE='1'" >> $GITHUB_ENV
-          echo "repo_dir=$(mktemp -d)" >> $GITHUB_ENV
+          echo "repo_dir=." >> $GITHUB_ENV
         shell: bash
       - run: ./hlint-from-scratch.sh --init="$repo_dir"
         shell: bash
diff --git a/README.md b/README.md
index 033da39..c397a8a 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# `hlint-from-scratch`
+# `hlint-from-scratch` [![hlint-from-scratch](https://github.com/shayne-fletcher/hlint-from-scratch/actions/workflows/hlint-from-scratch.yml/badge.svg)](https://github.com/shayne-fletcher/hlint-from-scratch/actions/workflows/hlint-from-scratch.yml)
 
 Scripts for building HLint from GHC `HEAD` (and other flavors).
 
diff --git a/hlint-from-scratch-cabal-build-test.sh b/hlint-from-scratch-cabal-build-test.sh
index c2e6ef6..eedbd22 100755
--- a/hlint-from-scratch-cabal-build-test.sh
+++ b/hlint-from-scratch-cabal-build-test.sh
@@ -24,7 +24,7 @@ opts:
 "
 usage="usage: $prog ARGS"
 
-ghc_version=""
+ghc_version="$(ghc --version | sed -e 's/The Glorious Glasgow Haskell Compilation System, version //g' -e 's/^/ghc-/g')"
 version_tag=""
 ghc_lib_dir=""
 ghc_lib_parser_ex_dir=""
@@ -84,17 +84,18 @@ done
 
 set -u
 
-[ ! -f "$HOME/$ghc_version/bin/ghc" ] && { echo "$HOME/$ghc_version/bin/ghc not found" && exit 1; }
-PATH="$HOME/$ghc_version/bin:$PATH"
-export PATH
+if [ -d "$HOME/$ghc_version" ]; then
+  PATH="$HOME/$ghc_version/bin:$PATH"
+  export PATH
+fi
 
 # Make sure cabal-install is up-to-date with the most recent
 # available. At this time there aren't build plans for compilers >
 # ghc-9.2.4.
-(PATH=$HOME/ghc-9.2.4/bin:$PATH; export PATH && \
-     cabal update && \
-     cabal new-install cabal-install --overwrite-policy=always \
-)
+# (PATH=$HOME/ghc-9.2.4/bin:$PATH; export PATH && \
+#      cabal update && \
+#      cabal new-install cabal-install --overwrite-policy=always \
+# )
 
 echo "cabal-install: $(which cabal)"
 echo "cabal-install version: $(cabal -V)"
diff --git a/hlint-from-scratch.sh b/hlint-from-scratch.sh
index 3883447..d7db4ab 100755
--- a/hlint-from-scratch.sh
+++ b/hlint-from-scratch.sh
@@ -234,9 +234,9 @@ if [ -z "$GHC_FLAVOR" ]; then
 else
     eval "$cmd" "$GHC_FLAVOR"
 fi
-sha_ghc_lib_parser=$(shasum -a 256 "$repo_dir"/ghc-lib/ghc-lib-parser-"$version".tar.gz | awk '{ print $1 }')
+#sha_ghc_lib_parser=$(shasum -a 256 "$repo_dir"/ghc-lib/ghc-lib-parser-"$version".tar.gz | awk '{ print $1 }')
 
-# temp disable while i focus on minimal set of github actions
+# temp disabled while i focus on minimal set of github actions
 if false; then
   if [ -z "$GHC_FLAVOR" ]; then
       # If the above worked out, update CI.hs.
@@ -305,8 +305,7 @@ $allow_newer\n\
 # --\n\
 extra-deps:\n\
   # ghc-lib-parser\n\
-  - archive: ${repo_dir}/ghc-lib/ghc-lib-parser-${version}.tar.gz\n\
-    sha256: \"${sha_ghc_lib_parser}\";\
+  - archive: ${repo_dir}/ghc-lib/ghc-lib-parser-${version}.tar.gz;\
 g" | \
   sed -e "s;^resolver:.*$;resolver: ${resolver};g" > stack-head.yaml
 else
@@ -314,7 +313,6 @@ else
 resolver: $resolver
 extra-deps:
   - archive: ${repo_dir}/ghc-lib/ghc-lib-parser-$version.tar.gz
-    sha256: "$sha_ghc_lib_parser"
 ghc-options:
     "$DOLLAR$everything": -j
     "$DOLLAR$locals": -ddump-to-file -ddump-hi -Wall -Wno-name-shadowing -Wunused-imports
@@ -333,8 +331,11 @@ stack_yaml=stack-head.yaml
 stack_yaml_flag="--stack-yaml $stack_yaml"
 # No need to pass $resolver_flag here, we fixed the resolver in
 # 'stack-head.yaml'.
+set +e
+cat "$stack_yaml"
 eval "$runhaskell $stack_yaml_flag CI.hs -- $no_builds $stack_yaml_flag --version-tag $version"
-sha_ghc_lib_parser_ex=$(shasum -a 256 "$repo_dir"/ghc-lib-parser-ex/ghc-lib-parser-ex-"$version".tar.gz | awk '{ print $1 }')
+# sha_ghc_lib_parser_ex=$(shasum -a 256 "$repo_dir"/ghc-lib-parser-ex/ghc-lib-parser-ex-"$version".tar.gz | awk '{ print $1 }')
+set -e
 
 # Hlint
 
@@ -376,9 +377,7 @@ packages:
   - .
 extra-deps:
   - archive: $repo_dir/ghc-lib/ghc-lib-parser-$version.tar.gz
-    sha256: "$sha_ghc_lib_parser"
   - archive: $repo_dir/ghc-lib-parser-ex/ghc-lib-parser-ex-$version.tar.gz
-    sha256: "$sha_ghc_lib_parser_ex"
 ghc-options:
     "$DOLLAR$everything": -j
     "$DOLLAR$locals": -ddump-to-file -ddump-hi -Werror=unused-imports -Werror=unused-local-binds -Werror=unused-top-binds -Werror=orphans
@@ -400,17 +399,34 @@ if ! [ "$no_builds" == --no-builds ]; then
   # Again, wrong to pass $resolver_flag here.
 
   # Build hlint.
-  eval "C_INCLUDE_PATH=$(xcrun --show-sdk-path)/usr/include/ffi" "stack" "$stack_yaml_flag" "build"
+  if [ $(uname) == 'Darwin' ]; then
+    eval "C_INCLUDE_PATH=$(xcrun --show-sdk-path)/usr/include/ffi" "stack" "$stack_yaml_flag" "build"
+  else
+    eval "stack" "$stack_yaml_flag" "build"
+  fi
 
   # Run its tests.
-  eval "C_INCLUDE_PATH=$(xcrun --show-sdk-path)/usr/include/ffi" "stack" "$stack_yaml_flag" "run" "--" "--test"
+  if [ $(uname) == 'Darwin' ]; then
+    eval "C_INCLUDE_PATH=$(xcrun --show-sdk-path)/usr/include/ffi" "stack" "$stack_yaml_flag" "run" "--" "--test"
+  else
+    eval "stack" "$stack_yaml_flag" "run" "--" "--test"
+  fi
 
   # Test there are no changes to 'hints.md'.
-  eval "C_INCLUDE_PATH=$(xcrun --show-sdk-path)/usr/include/ffi" "stack" "$stack_yaml_flag" "run" "--" "hlint" "--generate-summary"
+  if [ $(uname) == 'Darwin' ]; then
+    eval "C_INCLUDE_PATH=$(xcrun --show-sdk-path)/usr/include/ffi" "stack" "$stack_yaml_flag" "run" "--" "hlint" "--generate-summary"
+  else
+    eval "stack" "$stack_yaml_flag" "run" "--" "hlint" "--generate-summary"
+  fi
+
   git diff --exit-code hints.md
 
   # Run it on its own source.
-  eval "C_INCLUDE_PATH=$(xcrun --show-sdk-path)/usr/include/ffi" "stack" "$stack_yaml_flag" "run" "--" "src"
+  if [ $(uname) == 'Darwin' ]; then
+    eval "C_INCLUDE_PATH=$(xcrun --show-sdk-path)/usr/include/ffi" "stack" "$stack_yaml_flag" "run" "--" "src"
+  else
+    eval "stack" "$stack_yaml_flag" "run" "--" "src"
+  fi
 fi
 
 # --
@@ -445,9 +461,8 @@ eval "stack" "$stack_yaml_flag" "sdist" "." "--tar-dir" "."
 #   - Depending on the contents of `$with_haddock_flag`. Also,
 # - Run ghc-lib-test-mini-hlint, ghc-lib-test-mini-compile and the
 #   hlint test suite.
-tmp_dir="$HOME/tmp"
-mkdir -p "$tmp_dir"
-(cd "$HOME"/tmp && hlint-from-scratch-cabal-build-test.sh  \
+tmp_dir=$(mktemp -d)
+(cd "$tmp_dir" && hlint-from-scratch-cabal-build-test.sh  \
      "$cabal_with_ghc_flag"                                \
      --version-tag="$version"                              \
      --ghc-lib-dir="$repo_dir/ghc-lib"                     \