diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 3a3d0d7..c321cf2 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -25,13 +25,26 @@ jobs:
       - name: Install packages
         run: |
           if [ ${{ matrix.os }} == "ubuntu-latest" ] ; then
-            sudo apt-get update -qq && sudo apt-get install -y gobjc++ libgnustep-base-dev
+            sudo apt-get update -qq && sudo apt-get install -y gobjc++ libgnustep-base-dev libgsl-dev
+          else
+            /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+            brew install gsl || true
           fi
       - uses: actions/cache@v3
         with:
           path: ~/.stack
           key: stack-${{ matrix.os }}-${{ matrix.stackage }}-${{ hashFiles('stack.yaml') }}
       - name: Build
-        run: stack build --stack-yaml stack-${{ matrix.stackage }}.yaml --flag inline-c-cpp:std-vector-example
+        run: |
+          if [ ${{ matrix.os }} == "ubuntu-latest" ] ; then
+            stack build --stack-yaml stack-${{ matrix.stackage }}.yaml --flag inline-c:gsl-example --flag inline-c-cpp:std-vector-example
+          else
+            stack build --stack-yaml stack-${{ matrix.stackage }}.yaml --flag inline-c-cpp:std-vector-example
+          fi
       - name: Test
-        run: stack test --stack-yaml stack-${{ matrix.stackage }}.yaml --flag inline-c-cpp:std-vector-example
+        run: |
+          if [ ${{ matrix.os }} == "ubuntu-latest" ] ; then
+            stack test --stack-yaml stack-${{ matrix.stackage }}.yaml --flag inline-c:gsl-example --flag inline-c-cpp:std-vector-example
+          else
+            stack test --stack-yaml stack-${{ matrix.stackage }}.yaml --flag inline-c-cpp:std-vector-example
+          fi
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 1849d5e..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,78 +0,0 @@
-# Use new container infrastructure to enable caching
-sudo: false
-
-# Choose a lightweight base image; we provide our own build tools.
-language: c
-
-# GHC depends on GMP. You can add other dependencies here as well.
-addons:
-  apt:
-    packages:
-    - libgmp-dev
-    - libgsl0-dev
-    - libcairo2-dev
-  homebrew:
-    packages:
-    - cairo
-    - gsl
-
-matrix:
-  include:
-   - env: ARGS="--flag inline-c:gsl-example --flag inline-c-cpp:std-vector-example"
-   - env: ARGS="--stack-yaml stack-nightly-2021-01-01.yaml --flag inline-c:gsl-example --flag inline-c-cpp:std-vector-example"
-   - env: ARGS="--stack-yaml stack-lts-14.27.yaml --flag inline-c:gsl-example --flag inline-c-cpp:std-vector-example"
-   - env: ARGS="--stack-yaml stack-lts-12.26.yaml --flag inline-c:gsl-example --flag inline-c-cpp:std-vector-example"
-
-   - env: ARGS="--flag inline-c-cpp:std-vector-example"
-     os: osx
-   - env: ARGS="--stack-yaml stack-nightly-2021-01-01.yaml --flag inline-c-cpp:std-vector-example"
-     os: osx
-   - env: ARGS="--stack-yaml stack-lts-14.27.yaml --flag inline-c-cpp:std-vector-example"
-     os: osx
-  # LTS 12.26 fails with
-  # inline-c-cpp        > Linking .stack-work/dist/x86_64-osx/Cabal-2.2.0.1/build/tests/tests ...
-  # inline-c-cpp        > clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated [-Wdeprecated]
-  # inline-c-cpp        > clang: warning: argument unused during compilation: '-nopie' [-Wunused-command-line-argument]
-  # inline-c-cpp        > 
-  # inline-c-cpp        > /Users/travis/build/fpco/inline-c/inline-c-cpp/In file included from /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/ghc9189_0/ghc_3.c:1:0: error:
-  # inline-c-cpp        >     
-  # inline-c-cpp        > 
-  # inline-c-cpp        > /Users/travis/build/fpco/inline-c/inline-c-cpp/In file included from /Users/travis/.stack/programs/x86_64-osx/ghc-8.4.4/lib/ghc-8.4.4/include/Rts.h:29:0: error:
-  # inline-c-cpp        >     
-  # inline-c-cpp        > 
-  # inline-c-cpp        > /Users/travis/build/fpco/inline-c/inline-c-cpp//Users/travis/.stack/programs/x86_64-osx/ghc-8.4.4/lib/ghc-8.4.4/include/Stg.h:29:3: error:
-  # inline-c-cpp        >      error: __STDC_VERSION__ does not advertise C99 or later
-  # inline-c-cpp        >    |
-  # inline-c-cpp        > 29 | # error __STDC_VERSION__ does not advertise C99 or later
-  # inline-c-cpp        >    |   ^
-  # inline-c-cpp        > # error __STDC_VERSION__ does not advertise C99 or later
-  #  - env: ARGS="--stack-yaml stack-lts-12.26.yaml --flag inline-c-cpp:std-vector-example"
-  #    os: osx
-
-before_install:
-# Download and unpack the stack executable
-- mkdir -p ~/.local/bin
-- export PATH=$HOME/.local/bin:$PATH
-- |
-  if [ `uname` = "Darwin" ]
-  then
-    travis_retry sh -c "curl --insecure -L https://get.haskellstack.org/stable/osx-x86_64.tar.gz | tar xz --strip-components=1 --include '*/stack' -C ~/.local/bin"
-  else
-    travis_retry sh -c "curl -L https://get.haskellstack.org/stable/linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'"
-  fi
-
-# This line does all of the work: installs GHC if necessary, build the library,
-# executables, and test suites, and runs the test suites. --no-terminal works
-# around some quirks in Travis's terminal implementation.
-# -j1: work around /tmp/stack-ce322b87c3e4fa73/test-ghc-env: openBinaryFile: resource busy (file is locked)
-#      as suggested by ulidtko here https://github.com/commercialhaskell/stack/issues/5024#issuecomment-690063488
-script: stack --no-terminal --install-ghc test -j1 --haddock $ARGS
-
-# Caching so the next build will be fast too.
-cache:
-  directories:
-  - $HOME/.stack
-  - .stack-work
-  - inline-c/.stack-work/
-  - inline-c-cpp/.stack-work/
-  - sample-cabal-project/.stack-work/
diff --git a/inline-c/examples/gsl-ode.hs b/inline-c/examples/gsl-ode.hs
index b1d5007..9ec8ce9 100644
--- a/inline-c/examples/gsl-ode.hs
+++ b/inline-c/examples/gsl-ode.hs
@@ -3,7 +3,7 @@
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE MultiWayIf #-}
-import           Data.Coerce (coerce)
+import           Unsafe.Coerce (unsafeCoerce)
 import           Data.Monoid ((<>))
 import qualified Data.Vector.Storable as V
 import qualified Data.Vector.Storable.Mutable as VM
@@ -11,11 +11,11 @@ import           Foreign.C.Types
 import           Foreign.ForeignPtr (newForeignPtr_)
 import           Foreign.Ptr (Ptr)
 import           Foreign.Storable (Storable)
-import qualified Graphics.Rendering.Chart.Backend.Cairo as Chart
-import qualified Graphics.Rendering.Chart.Easy as Chart
 import qualified Language.C.Inline as C
 import qualified Language.C.Inline.Unsafe as CU
 import           System.IO.Unsafe (unsafePerformIO)
+import           Control.Monad (forM_)
+import           System.IO (withFile, hPutStrLn, IOMode(..))
 
 C.context (C.baseCtx <> C.vecCtx <> C.funCtx)
 
@@ -94,7 +94,7 @@ solveOde
   -> Either String (V.Vector Double)
   -- ^ Solution at end point, or error.
 solveOde fun x0 f0 xend =
-  coerce $ solveOdeC (coerce fun) (coerce x0) (coerce f0) (coerce xend)
+  unsafeCoerce $ solveOdeC (unsafeCoerce fun) (unsafeCoerce x0) (unsafeCoerce f0) (unsafeCoerce xend)
 
 lorenz
   :: Double
@@ -121,9 +121,9 @@ lorenz x0 f0 xend = solveOde fun x0 f0 xend
            ]
 
 main :: IO ()
-main = Chart.toFile Chart.def "lorenz.png" $ do
-    Chart.layout_title Chart..= "Lorenz"
-    Chart.plot $ Chart.line "curve" [pts]
+main = withFile "lorenz.csv" WriteMode $ \h ->
+         forM_ pts $ \(x,y) ->
+           hPutStrLn h $ show x ++ ", " ++ show y
   where
     pts = [(f V.! 0, f V.! 2) | (_x, f) <- go 0 (V.fromList [10.0 , 1.0 , 1.0])]
 
diff --git a/inline-c/inline-c.cabal b/inline-c/inline-c.cabal
index ae33e51..04c8f96 100644
--- a/inline-c/inline-c.cabal
+++ b/inline-c/inline-c.cabal
@@ -88,7 +88,5 @@ executable gsl-ode
     build-depends:     base >=4 && <5
                      , inline-c
                      , vector
-                     , Chart >= 1.3
-                     , Chart-cairo
   else
     buildable: False
diff --git a/stack-lts-20.yaml b/stack-lts-20.yaml
index 1823663..9959c4e 100644
--- a/stack-lts-20.yaml
+++ b/stack-lts-20.yaml
@@ -4,7 +4,3 @@ packages:
 - inline-c-cpp
 - inline-c-objc
 - sample-cabal-project
-extra-deps:
-- Chart-cairo-1.9.3@sha256:f484a7194ca08ed67f02aa626e2f8f4d1a9b50624e0d50e3ced62958f7481cca,925
-- cairo-0.13.8.0@sha256:9b64a376ebaa4f153bba5866a32291fd4bed48147009cce9158ce6533928eba8,4075
-- gtk2hs-buildtools-0.13.8.0@sha256:132f38155fc677430a47ea750918973161c876fb6f281d342ac2f07eb99229ce,5238
diff --git a/stack-lts-21.yaml b/stack-lts-21.yaml
index 635befd..e339fe4 100644
--- a/stack-lts-21.yaml
+++ b/stack-lts-21.yaml
@@ -4,7 +4,3 @@ packages:
 - inline-c-cpp
 - inline-c-objc
 - sample-cabal-project
-extra-deps:
-- Chart-cairo-1.9.3@sha256:f484a7194ca08ed67f02aa626e2f8f4d1a9b50624e0d50e3ced62958f7481cca,925
-- cairo-0.13.8.0@sha256:9b64a376ebaa4f153bba5866a32291fd4bed48147009cce9158ce6533928eba8,4075
-- gtk2hs-buildtools-0.13.8.0@sha256:132f38155fc677430a47ea750918973161c876fb6f281d342ac2f07eb99229ce,5238
diff --git a/stack-nightly.yaml b/stack-nightly.yaml
index 2e612a0..aba2285 100644
--- a/stack-nightly.yaml
+++ b/stack-nightly.yaml
@@ -4,7 +4,3 @@ packages:
 - inline-c-cpp
 - inline-c-objc
 - sample-cabal-project
-extra-deps:
-- Chart-cairo-1.9.3@sha256:f484a7194ca08ed67f02aa626e2f8f4d1a9b50624e0d50e3ced62958f7481cca,925
-- cairo-0.13.8.0@sha256:9b64a376ebaa4f153bba5866a32291fd4bed48147009cce9158ce6533928eba8,4075
-- gtk2hs-buildtools-0.13.8.0@sha256:132f38155fc677430a47ea750918973161c876fb6f281d342ac2f07eb99229ce,5238