diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index 48551f0a..3b34618b 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -64,6 +64,8 @@ jobs:
           chmod a+x "$HOME/.ghcup/bin/ghcup"
           "$HOME/.ghcup/bin/ghcup" install ghc "$HCVER" || (cat "$HOME"/.ghcup/logs/*.* && false)
           "$HOME/.ghcup/bin/ghcup" install cabal 3.12.1.0 || (cat "$HOME"/.ghcup/logs/*.* && false)
+          apt-get update
+          apt-get install -y libclang-dev
         env:
           HCKIND: ${{ matrix.compilerKind }}
           HCNAME: ${{ matrix.compiler }}
@@ -165,6 +167,12 @@ jobs:
           echo "package hs-bindgen" >> cabal.project
           echo "    ghc-options: -Werror=missing-methods" >> cabal.project
           cat >> cabal.project <<EOF
+          package hs-bindgen
+            extra-lib-dirs:     /usr/lib/llvm-18/lib
+            extra-include-dirs: /usr/lib/llvm-18/include
+
+          package hs-bindgen
+            ghc-options: -Werror
           EOF
           $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: any.$_ installed\n" unless /^(hs-bindgen)$/; }' >> cabal.project.local
           cat cabal.project
diff --git a/cabal.haskell-ci b/cabal.haskell-ci
new file mode 100644
index 00000000..bca84b5f
--- /dev/null
+++ b/cabal.haskell-ci
@@ -0,0 +1,2 @@
+copy-fields: all
+apt: libclang-dev 
diff --git a/cabal.project b/cabal.project
index e8522a6f..4ba5f021 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1 +1,9 @@
 packages: hs-bindgen
+
+-- TODO: <https://github.com/well-typed/hs-bindgen/issues/78>
+-- We should instead /discover/ where @libclang@ is.
+package hs-bindgen
+  extra-lib-dirs:
+    /usr/lib/llvm-18/lib
+  extra-include-dirs:
+    /usr/lib/llvm-18/include
diff --git a/cabal.project.ci b/cabal.project.ci
index dfca401c..6b0743fb 100644
--- a/cabal.project.ci
+++ b/cabal.project.ci
@@ -1,4 +1,12 @@
 packages: hs-bindgen
 
+-- TODO: <https://github.com/well-typed/hs-bindgen/issues/78>
+-- We should instead /discover/ where @libclang@ is.
+package hs-bindgen
+  extra-lib-dirs:
+    /usr/lib/llvm-14/lib
+  extra-include-dirs:
+    /usr/lib/llvm-14/include
+
 package hs-bindgen
   ghc-options: -Werror
diff --git a/hs-bindgen/hs-bindgen.cabal b/hs-bindgen/hs-bindgen.cabal
index 03f19c6d..95139dcd 100644
--- a/hs-bindgen/hs-bindgen.cabal
+++ b/hs-bindgen/hs-bindgen.cabal
@@ -40,6 +40,8 @@ library
       HsBindgen.Spec
   other-modules:
       HsBindgen.Annotation
+      HsBindgen.C
+      HsBindgen.Clang
       HsBindgen.Spec.Resolved
   hs-source-dirs:
       src
@@ -48,6 +50,11 @@ library
     , haskell-src-meta >= 0.8  && < 0.9
     , template-haskell >= 2.18 && < 2.23
 
+  -- TODO: <https://github.com/llvm/llvm-project/issues/9777>
+  -- It seems @libclang@ does not support @pkg-config@.
+  extra-libraries:
+      clang
+
 executable hs-bindgen
   import:
       lang
diff --git a/hs-bindgen/src/HsBindgen/C.hs b/hs-bindgen/src/HsBindgen/C.hs
new file mode 100644
index 00000000..963b4609
--- /dev/null
+++ b/hs-bindgen/src/HsBindgen/C.hs
@@ -0,0 +1,10 @@
+-- | Abstract syntax tree for C headers
+--
+-- The goal of this module is not to be a complete representation of the full
+-- C AST, but rather to include only the information that is relevant to us.
+--
+-- Intended for qualified import.
+--
+-- > import HsBindgen.C qualfified as C
+module HsBindgen.C (
+  ) where
diff --git a/hs-bindgen/src/HsBindgen/Clang.hs b/hs-bindgen/src/HsBindgen/Clang.hs
new file mode 100644
index 00000000..c4a6a09e
--- /dev/null
+++ b/hs-bindgen/src/HsBindgen/Clang.hs
@@ -0,0 +1,10 @@
+-- | Bindings to @libclang@
+--
+-- The goal of this module is not to be a complete set of bindings for all of
+-- @libclang@, but rather only to the parts that we need.
+--
+-- Intended for qualified import.
+--
+-- > import Hsbindgen.Clang qualified as Clang
+module HsBindgen.Clang (
+  ) where