diff --git a/.github/workflows/binaries-mac-x64.yml b/.github/workflows/binaries-mac-x64.yml
deleted file mode 100644
index ee8110b..0000000
--- a/.github/workflows/binaries-mac-x64.yml
+++ /dev/null
@@ -1,141 +0,0 @@
-# Runs on any push or pr, and weekly on main.
-# Produces optimised mac binaries and runs unit/doc/functional tests,
-# using the default stack.yaml's GHC version.
-
-name: binaries-mac-x64
-env:
-  CONTINUE: true
-
-on:
-  schedule:
-  - cron: "0 07 * * 0"  # sunday midnight pacific
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-  workflow_dispatch:
-
-jobs:
-  build:
-    runs-on: macos-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        plan:
-        # - { ghc: "810" , stack: "stack --stack-yaml=stack8.10.yaml" }
-        # XXX func tests in bin should be run only with GHC 8.10 for now (see shelltest below) (?)
-        # - { ghc: "90" , stack: "stack --stack-yaml=stack9.0.yaml" }
-        # - { ghc: "92" , stack: "stack --stack-yaml=stack9.2.yaml" }
-        - { ghc: "94" , stack: "stack --stack-yaml=stack.yaml" }
-
-    steps:
-
-    - name: Check out
-      uses: actions/checkout@v3
-      # have to fetch everything for git describe for --version
-      with: 
-        fetch-depth: 0        
-
-    - name: Check embedded files
-      run: |
-        brew install ripgrep
-        tools/checkembeddedfiles
-      if: env.CONTINUE
-
-    # things to be cached/restored:
-
-    - name: Cache stack global package db
-      id:   stack-global
-      uses: actions/cache@v3
-      with:
-        path: ~/.stack
-        key: ${{ runner.os }}-stack-global-from20220817-${{ hashFiles('**.yaml') }}
-        restore-keys: |
-             ${{ runner.os }}-stack-global-from20220817
-      if: env.CONTINUE
-
-    - name: Cache stack-installed programs in ~/.local/bin
-      id:   stack-programs
-      uses: actions/cache@v3
-      with:
-        path: ~/.local/bin
-        key: ${{ runner.os }}-stack-programs-from20220817-${{ hashFiles('**.yaml') }}
-        restore-keys: |
-             ${{ runner.os }}-stack-programs-from20220817
-      if: env.CONTINUE
-
-    - name: Cache .stack-work
-      uses: actions/cache@v3
-      with:
-        path: .stack-work
-        key: ${{ runner.os }}-stack-work-from20230907-${{ hashFiles('**.yaml') }}
-        restore-keys: |
-             ${{ runner.os }}-stack-work-from20230907
-      if: env.CONTINUE
-
-    - name: Install stack
-      run: |
-        mkdir -p ~/.local/bin
-        export PATH=~/.local/bin:$PATH        
-        if [[ ! -x ~/.local/bin/stack ]]; then brew install gnu-tar; curl -sL https://get.haskellstack.org/stable/osx-x86_64.tar.gz | gtar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'; chmod a+x ~/.local/bin/stack; fi
-        stack --version
-      if: env.CONTINUE
-
-    - name: Install GHC (with stack)
-      env:
-        stack: ${{ matrix.plan.stack }}
-      run: |
-        $stack setup --install-ghc
-      if: env.CONTINUE
-
-    # - name: Install GHC (with ghcup)
-    #   run: |
-    #     mkdir -p ~/.ghcup/bin && curl -sL https://downloads.haskell.org/~ghcup/x86_64-apple-darwin-ghcup > ~/.ghcup/bin/ghcup && chmod +x ~/.ghcup/bin/ghcup
-    #     ~/.ghcup/bin/ghcup install --set ghc 9.2.4  # && ~/.ghcup/bin/ghcup install stack
-    #     echo "$HOME/.ghcup/bin/" >> $GITHUB_PATH
-    #   if: env.CONTINUE
-
-    # - name: Install GHC (from haskell.org)
-    #   run: |
-    #     curl -sL https://downloads.haskell.org/~ghc/9.2.4/ghc-9.2.4-x86_64-apple-darwin.tar.xz | tar xj && cd ghc-9.2.4-x86_64-apple-darwin && ./configure && make install
-    #     ghc --version
-    #     mkdir -p ~/.stack && printf "system-ghc: true\ninstall-ghc: false\n" >>~/.stack/config.yaml
-    #   if: env.CONTINUE
-
-    - name: Install haskell deps
-      env:
-        stack: ${{ matrix.plan.stack }}
-      run: |
-        $stack build --test --only-dependencies --dry-run
-        $stack build --test --only-dependencies
-      if: env.CONTINUE
-
-    - name: Build omnibus and test unit tests, doc tests
-      env:
-        stack: ${{ matrix.plan.stack }}
-      run: |
-        $stack install --test --force-dirty --ghc-options=-fforce-recomp --ghc-options=-Werror
-        # --ghc-options=-split-sections doesn't work on mac
-        #  --pedantic
-      if: env.CONTINUE
-
-    # artifacts:
-
-    - name: Gather binaries
-      run: |
-        mkdir tmp
-        cd tmp
-        cp ~/.local/bin/omnibus .
-        strip omnibus
-        tar cvf omnibus-mac-x64.tar omnibus
-      if: env.CONTINUE
-
-    # upload-artifact loses execute permissions, so we tar the binaries to preserve them.
-    # github UI always zips artifacts when they are downloaded, so we don't bother compressing the tar.
-    # Unfortunately it means users must both unzip and untar.
-    - name: Upload binaries artifact
-      uses: actions/upload-artifact@v3
-      with:
-        name: omnibus-mac-x64
-        path: tmp/omnibus-mac-x64.tar
-      if: env.CONTINUE
\ No newline at end of file
diff --git a/.github/workflows/binaries-windows-x64.yml b/.github/workflows/binaries-windows-x64.yml
deleted file mode 100644
index 3a4641f..0000000
--- a/.github/workflows/binaries-windows-x64.yml
+++ /dev/null
@@ -1,122 +0,0 @@
-# Runs on any push to main and PRs, along with weekly builds on main.
-# Produces optimised windows binaries,
-# using the default stack.yaml's GHC version.
-# Currently runs no tests.
-# Temporarily using nightly-2023-04-24 (ghc-9.4.4) to avoid https://gitlab.haskell.org/ghc/ghc/-/issues/23309
-# This actions script is lightly modified from hledger
-#
-# Not using nightly stackage here...
-
-name: binaries-windows-x64
-env:
-  CONTINUE: true
-
-on:
-  schedule:
-  - cron: "0 07 * * 0"  # sunday midnight pacific
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-  workflow_dispatch:
-
-
-jobs:
-  build:
-    runs-on: windows-latest
-    defaults:
-      run:
-        shell: bash
-    steps:
-
-    - name: Check out
-      uses: actions/checkout@v3
-      # have to fetch everything for git describe for --version
-      with: 
-        fetch-depth: 0        
-
-    - name: Confirm all remaining steps should run
-      run: echo "CONTINUE=true" >> $GITHUB_ENV
-
-    # things to be cached/restored:
-
-    - name: Cache stack global package db
-      id:   stack-global-package-db
-      uses: actions/cache@v3
-      with:
-        path: C:\Users\runneradmin\AppData\Roaming\stack\
-        key: ${{ runner.os }}-appdata-roaming-stack-${{ hashFiles('**.yaml') }}
-        restore-keys: |
-             ${{ runner.os }}-appdata-roaming-stack
-      if: env.CONTINUE
-
-    - name: Cache stack programs dir   # ghc, ghc-included packages and their haddocks, mingw, msys2
-      id:   stack-programs-dir
-      uses: actions/cache@v3
-      with:
-        path: C:\Users\runneradmin\AppData\Local\Programs\stack\
-        # which files signal a change in stack's global db ?
-        # **.yaml includes */package.yaml and stack.yaml* (too many), and hopefully no other changing yamls
-        key: ${{ runner.os }}-appdata-local-programs-stack-${{ hashFiles('**.yaml') }}
-        restore-keys: |
-             ${{ runner.os }}-appdata-local-programs-stack
-      if: env.CONTINUE
-
-    - name: Cache .stack-work
-      uses: actions/cache@v3
-      with:
-        path: .stack-work
-        key: ${{ runner.os }}-stack-work-${{ hashFiles('**.yaml') }}
-        restore-keys: |
-             ${{ runner.os }}-stack-work
-      if: env.CONTINUE
-
-    # actions:
-
-    - name: Install stack
-      run: |
-        curl -sL https://get.haskellstack.org/stable/windows-x86_64.zip -o stack.zip
-        7z x stack.zip stack.exe
-        which stack
-        stack --version
-        which ./stack
-        ./stack --version
-      if: env.CONTINUE
-
-    - name: Install GHC
-      run: |
-        ./stack --no-terminal setup --install-ghc
-      if: env.CONTINUE
-
-    - name: Install haskell deps
-      run: |
-        ./stack --no-terminal build --only-dependencies --dry-run
-        ./stack --no-terminal build --only-dependencies
-      if: env.CONTINUE
-
-    # use whichever GHC is in default stack.yaml
-
-    - name: Build fits-parse, test it and build the omnibus CLI
-      run: |
-        ./stack --no-terminal install --test --force-dirty --ghc-options=-fforce-recomp --ghc-options=-Werror
-      # --ghc-options=-split-sections doesn't work on windows, "too many sections"
-      # --pedantic
-      if: env.CONTINUE
-
-    # artifacts:
-
-    - name: Gather binaries
-      run: |
-        mkdir tmp
-        cd tmp
-        cp /C/Users/runneradmin/AppData/Roaming/local/bin/omnibus.exe .
-        strip omnibus.exe
-      if: env.CONTINUE
-             
-    - name: Create binaries artifact
-      uses: actions/upload-artifact@v3
-      with:
-        name: omnibus-windows-x64
-        path: |
-          tmp/omnibus.exe
-      if: env.CONTINUE
\ No newline at end of file
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..bb5c3b7
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,21 @@
+on: [push]
+name: build
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        ghc: ['9.8.4']
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+    name: Haskell GHC ${{ matrix.ghc }} ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Haskell
+        uses: haskell-actions/setup@v2
+        with:
+          ghc-version: ${{ matrix.ghc }}
+          enable-stack: true
+          stack-no-global: true
+          stack-setup-ghc: true
+      - run: stack build
+      - run: stack test