diff --git a/.gersemirc b/.gersemirc
new file mode 100644
index 0000000..c6d6ef6
--- /dev/null
+++ b/.gersemirc
@@ -0,0 +1,5 @@
+# yamllint disable-line rule:line-length
+# yaml-language-server: $schema=https://raw.githubusercontent.com/BlankSpruce/gersemi/master/gersemi/configuration.schema.json
+
+line_length: 100
+list_expansion: "favour-expansion"
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..ccefcf6
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,38 @@
+# CMake 3.22.1 is the default on Ubuntu 22.04
+cmake_minimum_required(VERSION 3.22.1)
+
+project(
+    spider
+    LANGUAGES
+        C
+        CXX
+    VERSION 0.1.0
+)
+
+# Enable exporting compile commands
+set(CMAKE_EXPORT_COMPILE_COMMANDS
+    ON
+    CACHE BOOL
+    "Enable/Disable output of compile commands during generation."
+    FORCE
+)
+
+# Set the default build type to Release if not specified
+if(NOT CMAKE_BUILD_TYPE)
+    set(SPIDER_DEFAULT_BUILD_TYPE "Release")
+    message(STATUS "No build type specified. Setting to '${SPIDER_DEFAULT_BUILD_TYPE}'.")
+    set(CMAKE_BUILD_TYPE
+        "${SPIDER_DEFAULT_BUILD_TYPE}"
+        CACHE STRING
+        "Choose the type of build."
+        FORCE
+    )
+endif()
+
+add_executable(spider)
+target_compile_features(spider PRIVATE cxx_std_20)
+
+set(SPIDER_SOURCES src/spider/spider.cpp)
+target_sources(spider PRIVATE ${SPIDER_SOURCES})
+
+target_include_directories(spider PRIVATE src/)
diff --git a/README.md b/README.md
index 61b5c7e..14ab9d2 100644
--- a/README.md
+++ b/README.md
@@ -30,9 +30,11 @@ The commands above run all linting checks, but for performance you may want to r
 if you only changed C++ files, you don't need to run the YAML linting checks) using one of the tasks
 in the table below.
 
-| Task                    | Description                                              |
-|-------------------------|----------------------------------------------------------|
-| `lint:yml-check`        | Runs the YAML linters.                                   |
-| `lint:yml-fix`          | Runs the YAML linters and fixes some violations.         |
+| Task               | Description                                      |
+|--------------------|--------------------------------------------------|
+| `lint:cmake-check` | Runs the CMake linters.                          |
+| `lint:cmake-fix`   | Runs the CMake linters and fixes any violations. |
+| `lint:yml-check`   | Runs the YAML linters.                           |
+| `lint:yml-fix`     | Runs the YAML linters and fixes some violations. |
 
 [Task]: https://taskfile.dev
diff --git a/lint-requirements.txt b/lint-requirements.txt
index 993e8b4..2c40fe3 100644
--- a/lint-requirements.txt
+++ b/lint-requirements.txt
@@ -1 +1,2 @@
+gersemi>=0.16.2
 yamllint>=1.35.1
diff --git a/lint-tasks.yaml b/lint-tasks.yaml
index 1c5f153..2f4fbb2 100644
--- a/lint-tasks.yaml
+++ b/lint-tasks.yaml
@@ -6,12 +6,28 @@ vars:
 tasks:
   check:
     cmds:
+      - task: "cmake-check"
       - task: "yml-check"
 
   fix:
     cmds:
+      - task: "cmake-fix"
       - task: "yml-fix"
 
+  cmake-check:
+    deps: ["venv"]
+    cmds:
+      - task: "cmake"
+        vars:
+          FLAGS: "--check"
+
+  cmake-fix:
+    deps: ["venv"]
+    cmds:
+      - task: "cmake"
+        vars:
+          FLAGS: "--in-place"
+
   yml:
     aliases:
       - "yml-check"
@@ -22,6 +38,18 @@ tasks:
         . "{{.G_LINT_VENV_DIR}}/bin/activate"
         yamllint --strict .
 
+  cmake:
+    internal: true
+    requires:
+      vars: ["FLAGS"]
+    cmd: |-
+      . "{{.G_LINT_VENV_DIR}}/bin/activate"
+      find . \
+        -path ./build -prune \
+        -o -name CMakeLists.txt \
+        -print0 | \
+          xargs -0 --no-run-if-empty gersemi {{.FLAGS}}
+
   venv:
     internal: true
     vars:
@@ -32,6 +60,7 @@ tasks:
       - "{{.TASKFILE}}"
       - "lint-requirements.txt"
     generates: ["{{.CHECKSUM_FILE}}"]
+    run: "once"
     deps:
       - ":init"
       - task: ":utils:validate-checksum"
diff --git a/src/spider/spider.cpp b/src/spider/spider.cpp
new file mode 100644
index 0000000..54e47ec
--- /dev/null
+++ b/src/spider/spider.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    std::cout << "Hello, world!" << std::endl;
+    return 0;
+}