diff --git a/.github/workflows/website-build.yml b/.github/workflows/website-build.yml
index 5f0082f4b..7c8b82417 100644
--- a/.github/workflows/website-build.yml
+++ b/.github/workflows/website-build.yml
@@ -36,6 +36,5 @@ jobs:
           -DSOURCEMETA_CORE_HTML:BOOL=OFF
           -DSOURCEMETA_CORE_EXTENSION_ALTERSCHEMA:BOOL=OFF
           -DSOURCEMETA_CORE_EXTENSION_EDITORSCHEMA:BOOL=OFF
-          -DSOURCEMETA_CORE_EXTENSION_BUILD:BOOL=OFF
           -DSOURCEMETA_CORE_DOCS:BOOL=ON
       - run: cmake --build ./build --config Release --target doxygen
diff --git a/.github/workflows/website-deploy.yml b/.github/workflows/website-deploy.yml
index b4eef22c5..136f5ce1b 100644
--- a/.github/workflows/website-deploy.yml
+++ b/.github/workflows/website-deploy.yml
@@ -46,7 +46,6 @@ jobs:
           -DSOURCEMETA_CORE_HTML:BOOL=OFF
           -DSOURCEMETA_CORE_EXTENSION_ALTERSCHEMA:BOOL=OFF
           -DSOURCEMETA_CORE_EXTENSION_EDITORSCHEMA:BOOL=OFF
-          -DSOURCEMETA_CORE_EXTENSION_BUILD:BOOL=OFF
           -DSOURCEMETA_CORE_DOCS:BOOL=ON
       - run: cmake --build ./build --config Release --target doxygen
       - name: Setup Pages
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4e80b1e8d..bb9d77ad4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,7 +24,6 @@ option(SOURCEMETA_CORE_YAML "Build the Sourcemeta Core YAML library" ON)
 option(SOURCEMETA_CORE_HTML "Build the Sourcemeta Core HTML library" ON)
 option(SOURCEMETA_CORE_EXTENSION_ALTERSCHEMA "Build the Sourcemeta Core AlterSchema library" ON)
 option(SOURCEMETA_CORE_EXTENSION_EDITORSCHEMA "Build the Sourcemeta Core EditorSchema library" ON)
-option(SOURCEMETA_CORE_EXTENSION_BUILD "Build the Sourcemeta Core Build library" ON)
 option(SOURCEMETA_CORE_TESTS "Build the Sourcemeta Core tests" OFF)
 option(SOURCEMETA_CORE_BENCHMARK "Build the Sourcemeta Core benchmarks" OFF)
 option(SOURCEMETA_CORE_DOCS "Build the Sourcemeta Core docs" OFF)
@@ -144,10 +143,6 @@ if(SOURCEMETA_CORE_EXTENSION_EDITORSCHEMA)
   add_subdirectory(src/extension/editorschema)
 endif()
 
-if(SOURCEMETA_CORE_EXTENSION_BUILD)
-  add_subdirectory(src/extension/build)
-endif()
-
 if(SOURCEMETA_CORE_ADDRESS_SANITIZER)
   sourcemeta_sanitizer(TYPE address)
 elseif(SOURCEMETA_CORE_UNDEFINED_SANITIZER)
@@ -259,10 +254,6 @@ if(SOURCEMETA_CORE_TESTS)
     add_subdirectory(test/editorschema)
   endif()
 
-  if(SOURCEMETA_CORE_EXTENSION_BUILD)
-    add_subdirectory(test/build)
-  endif()
-
   if(PROJECT_IS_TOP_LEVEL)
     # Otherwise we need the child project to link
     # against the sanitizers too.
diff --git a/config.cmake.in b/config.cmake.in
index 7e5e6717c..9c5babb64 100644
--- a/config.cmake.in
+++ b/config.cmake.in
@@ -24,7 +24,6 @@ if(NOT SOURCEMETA_CORE_COMPONENTS)
   list(APPEND SOURCEMETA_CORE_COMPONENTS alterschema)
   list(APPEND SOURCEMETA_CORE_COMPONENTS editorschema)
   list(APPEND SOURCEMETA_CORE_COMPONENTS options)
-  list(APPEND SOURCEMETA_CORE_COMPONENTS build)
 endif()
 
 include(CMakeFindDependencyMacro)
@@ -116,9 +115,6 @@ foreach(component ${SOURCEMETA_CORE_COMPONENTS})
     include("${CMAKE_CURRENT_LIST_DIR}/sourcemeta_core_editorschema.cmake")
   elseif(component STREQUAL "options")
     include("${CMAKE_CURRENT_LIST_DIR}/sourcemeta_core_options.cmake")
-  elseif(component STREQUAL "build")
-    include("${CMAKE_CURRENT_LIST_DIR}/sourcemeta_core_io.cmake")
-    include("${CMAKE_CURRENT_LIST_DIR}/sourcemeta_core_build.cmake")
   else()
     message(FATAL_ERROR "Unknown Sourcemeta Core component: ${component}")
   endif()
diff --git a/src/extension/build/CMakeLists.txt b/src/extension/build/CMakeLists.txt
deleted file mode 100644
index aa6c9fbe2..000000000
--- a/src/extension/build/CMakeLists.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-sourcemeta_library(NAMESPACE sourcemeta PROJECT core NAME build
-  PRIVATE_HEADERS types.h adapter_filesystem.h SOURCES adapter_filesystem.cc)
-
-if(SOURCEMETA_CORE_INSTALL)
-  sourcemeta_library_install(NAMESPACE sourcemeta PROJECT core NAME build)
-endif()
-
-target_link_libraries(sourcemeta_core_build PRIVATE sourcemeta::core::io)
diff --git a/src/extension/build/adapter_filesystem.cc b/src/extension/build/adapter_filesystem.cc
deleted file mode 100644
index d14636c40..000000000
--- a/src/extension/build/adapter_filesystem.cc
+++ /dev/null
@@ -1,114 +0,0 @@
-#include <sourcemeta/core/build_adapter_filesystem.h>
-
-#include <sourcemeta/core/io.h>
-
-#include <cassert> // assert
-#include <fstream> // std::ofstream
-#include <mutex>   // std::unique_lock
-
-namespace sourcemeta::core {
-
-BuildAdapterFilesystem::BuildAdapterFilesystem(std::string dependency_extension)
-    : extension{std::move(dependency_extension)} {
-  assert(!this->extension.empty());
-  assert(this->extension.starts_with("."));
-}
-
-auto BuildAdapterFilesystem::dependencies_path(const node_type &path) const
-    -> node_type {
-  assert(path.is_absolute());
-  return path.string() + this->extension;
-}
-
-auto BuildAdapterFilesystem::read_dependencies(const node_type &path) const
-    -> std::optional<BuildDependencies<node_type>> {
-  assert(path.is_absolute());
-  const auto deps_path{this->dependencies_path(path)};
-  if (std::filesystem::exists(deps_path)) {
-    auto stream{sourcemeta::core::read_file(deps_path)};
-    assert(stream.is_open());
-
-    BuildDependencies<node_type> deps;
-    std::string line;
-    while (std::getline(stream, line)) {
-      // Prevent CRLF on Windows
-      if (!line.empty() && line.back() == '\r') {
-        line.pop_back();
-      }
-
-      if (!line.empty()) {
-        deps.emplace_back(line);
-      }
-    }
-
-    if (deps.empty()) {
-      return std::nullopt;
-    } else {
-      return deps;
-    }
-  } else {
-    return std::nullopt;
-  }
-}
-
-auto BuildAdapterFilesystem::write_dependencies(
-    const node_type &path, const BuildDependencies<node_type> &dependencies)
-    -> void {
-  assert(path.is_absolute());
-  assert(std::filesystem::exists(path));
-  // Try to make sure as much as we can that any write operation made to disk
-  flush(path);
-  this->refresh(path);
-  const auto deps_path{this->dependencies_path(path)};
-  std::filesystem::create_directories(deps_path.parent_path());
-  std::ofstream deps_stream{deps_path};
-  assert(!deps_stream.fail());
-  for (const auto &node : dependencies) {
-    deps_stream << node.string() << "\n";
-  }
-
-  deps_stream.flush();
-  deps_stream.close();
-  flush(deps_path);
-}
-
-auto BuildAdapterFilesystem::refresh(const node_type &path) -> void {
-  // We prefer our own computed marks so that we don't have to rely
-  // too much on file-system specific non-sense
-  const auto value{std::filesystem::file_time_type::clock::now()};
-  // Because builds are typically ran in parallel
-  std::unique_lock lock{this->mutex};
-  this->marks.insert_or_assign(path, value);
-}
-
-auto BuildAdapterFilesystem::mark(const node_type &path)
-    -> std::optional<mark_type> {
-  assert(path.is_absolute());
-
-  {
-    // Because a read operation while a write operation is taking place is
-    // undefined behaviour
-    std::shared_lock lock{this->mutex};
-    const auto match{this->marks.find(path)};
-    if (match != this->marks.end()) {
-      return match->second;
-    }
-  }
-
-  try {
-    // Keep in mind that depending on the OS, filesystem, and even standard
-    // library implementation, this value might not be very reliable. In fact,
-    // in many cases it can be outdated. Therefore, we never cache this value
-    return std::filesystem::last_write_time(path);
-  } catch (const std::filesystem::filesystem_error &) {
-    return std::nullopt;
-  }
-}
-
-auto BuildAdapterFilesystem::is_newer_than(const mark_type left,
-                                           const mark_type right) const
-    -> bool {
-  return left > right;
-}
-
-} // namespace sourcemeta::core
diff --git a/src/extension/build/include/sourcemeta/core/build.h b/src/extension/build/include/sourcemeta/core/build.h
deleted file mode 100644
index a5afa63a6..000000000
--- a/src/extension/build/include/sourcemeta/core/build.h
+++ /dev/null
@@ -1,106 +0,0 @@
-#ifndef SOURCEMETA_CORE_BUILD_H_
-#define SOURCEMETA_CORE_BUILD_H_
-
-// NOLINTBEGIN(misc-include-cleaner)
-#include <sourcemeta/core/build_adapter_filesystem.h>
-#include <sourcemeta/core/build_types.h>
-// NOLINTEND(misc-include-cleaner)
-
-#include <algorithm> // std::ranges::none_of
-#include <cassert>   // assert
-
-/// @defgroup build Build
-/// @brief A simple and minimalistic Make-style build system
-///
-/// This functionality is included as follows:
-///
-/// ```cpp
-/// #include <sourcemeta/core/build.h>
-/// ```
-
-namespace sourcemeta::core {
-
-/// @ingroup build
-///
-/// Run a handler given a destination node, a set of dependency nodes, and a
-/// context value. The semantics of how nodes are retrieved, stored, and checked
-/// for freshness depends on the adapter struct passed into the builder. If a
-/// node is considered fresh given its static or dynamic dependencies, the
-/// actual handler is never executed.
-///
-/// Here is an example using the `BuildAdapterFilesystem` pre-built
-/// opinionated adapter:
-///
-/// ```c++
-/// #include <sourcemeta/core/build.h>
-///
-/// auto HANDLER_COPY(
-///     const std::filesystem::path &destination,
-///     const sourcemeta::core::BuildDependencies<std::filesystem::path>
-///       &dependencies,
-///     // You may invoke this callback to register a dynamic dependency
-///     const sourcemeta::core::BuildDynamicCallback<std::filesystem::path> &,
-///     const std::filesystem::copy_options &options) -> void {
-///   std::filesystem::create_directories(destination.parent_path());
-///   std::filesystem::copy_file(dependencies.front(), destination, options);
-/// }
-///
-/// sourcemeta::core::BuildAdapterFilesystem adapter;
-///
-/// // The file will be generated
-/// sourcemeta::core::build<std::filesystem::copy_options>(
-///   adapter, HANDLER_COPY,
-///   "/tmp/destination.txt", {"/tmp/dependency.txt"},
-///   std::filesystem::copy_options::overwrite_existing);
-///
-/// // The second time will result in a cache hit
-/// sourcemeta::core::build<std::filesystem::copy_options>(
-///   adapter, HANDLER_COPY,
-///   "/tmp/destination.txt", {"/tmp/dependency.txt"},
-///   std::filesystem::copy_options::overwrite_existing);
-/// ```
-template <typename Context, typename Adapter>
-auto build(Adapter &adapter,
-           const BuildHandler<Context, typename Adapter::node_type> &handler,
-           const typename Adapter::node_type &destination,
-           const BuildDependencies<typename Adapter::node_type> &dependencies,
-           const Context &context) -> bool {
-  const auto destination_mark{adapter.mark(destination)};
-  const auto destination_dependencies{adapter.read_dependencies(destination)};
-  if (destination_mark.has_value() && destination_dependencies.has_value() &&
-      std::ranges::none_of(
-          destination_dependencies.value(),
-          [&adapter, &destination_mark](const auto &dependency) {
-            const auto dependency_mark = adapter.mark(dependency);
-            return !dependency_mark.has_value() ||
-                   adapter.is_newer_than(dependency_mark.value(),
-                                         destination_mark.value());
-          })) {
-    return false;
-  }
-
-  BuildDependencies<typename Adapter::node_type> deps;
-  for (const auto &dependency : dependencies) {
-    assert(adapter.mark(dependency).has_value());
-    deps.emplace_back(dependency);
-  }
-
-  handler(
-      destination, dependencies,
-      // This callback is used for build handlers to dynamically populate
-      // dependencies. This is very powerful for defining handlers where
-      // the actual list of dependencies is only known while or after
-      // processing the handler
-      [&](const auto &new_dependency) {
-        assert(adapter.mark(new_dependency).has_value());
-        deps.emplace_back(new_dependency);
-      },
-      context);
-
-  adapter.write_dependencies(destination, deps);
-  return true;
-}
-
-} // namespace sourcemeta::core
-
-#endif // SOURCEMETA_CORE_OPTIONS_H_
diff --git a/src/extension/build/include/sourcemeta/core/build_adapter_filesystem.h b/src/extension/build/include/sourcemeta/core/build_adapter_filesystem.h
deleted file mode 100644
index a71fa6c2a..000000000
--- a/src/extension/build/include/sourcemeta/core/build_adapter_filesystem.h
+++ /dev/null
@@ -1,58 +0,0 @@
-#ifndef SOURCEMETA_CORE_BUILD_ADAPTER_FILESYSTEM_H_
-#define SOURCEMETA_CORE_BUILD_ADAPTER_FILESYSTEM_H_
-
-#ifndef SOURCEMETA_CORE_BUILD_EXPORT
-#include <sourcemeta/core/build_export.h>
-#endif
-
-// NOLINTBEGIN(misc-include-cleaner)
-#include <sourcemeta/core/build_types.h>
-// NOLINTEND(misc-include-cleaner)
-
-#include <filesystem>    // std::filesystem
-#include <optional>      // std::optional
-#include <shared_mutex>  // std::shared_mutex
-#include <string>        // std::string
-#include <unordered_map> // std::unordered_map
-
-namespace sourcemeta::core {
-
-/// @ingroup build
-class SOURCEMETA_CORE_BUILD_EXPORT BuildAdapterFilesystem {
-public:
-  using node_type = std::filesystem::path;
-  using mark_type = std::filesystem::file_time_type;
-
-  BuildAdapterFilesystem() = default;
-  BuildAdapterFilesystem(std::string dependency_extension);
-
-  [[nodiscard]] auto dependencies_path(const node_type &path) const
-      -> node_type;
-  [[nodiscard]] auto read_dependencies(const node_type &path) const
-      -> std::optional<BuildDependencies<node_type>>;
-  auto write_dependencies(const node_type &path,
-                          const BuildDependencies<node_type> &dependencies)
-      -> void;
-  auto refresh(const node_type &path) -> void;
-  [[nodiscard]] auto mark(const node_type &path) -> std::optional<mark_type>;
-  [[nodiscard]] auto is_newer_than(const mark_type left,
-                                   const mark_type right) const -> bool;
-
-private:
-// Exporting symbols that depends on the standard C++ library is considered
-// safe.
-// https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-2-c4275?view=msvc-170&redirectedfrom=MSDN
-#if defined(_MSC_VER)
-#pragma warning(disable : 4251 4275)
-#endif
-  std::string extension{".deps"};
-  std::unordered_map<node_type, mark_type> marks;
-  std::shared_mutex mutex;
-#if defined(_MSC_VER)
-#pragma warning(default : 4251 4275)
-#endif
-};
-
-} // namespace sourcemeta::core
-
-#endif // SOURCEMETA_CORE_OPTIONS_H_
diff --git a/src/extension/build/include/sourcemeta/core/build_types.h b/src/extension/build/include/sourcemeta/core/build_types.h
deleted file mode 100644
index f789974c1..000000000
--- a/src/extension/build/include/sourcemeta/core/build_types.h
+++ /dev/null
@@ -1,26 +0,0 @@
-#ifndef SOURCEMETA_CORE_BUILD_TYPES_H_
-#define SOURCEMETA_CORE_BUILD_TYPES_H_
-
-#include <functional> // std::function
-#include <vector>     // std::vector
-
-namespace sourcemeta::core {
-
-/// @ingroup build
-template <typename NodeType>
-using BuildDynamicCallback = std::function<void(const NodeType &)>;
-
-/// @ingroup build
-/// Dependencies are encoded using an ordered sequence type
-template <typename NodeType> using BuildDependencies = std::vector<NodeType>;
-
-/// @ingroup build
-template <typename Context, typename NodeType>
-using BuildHandler =
-    std::function<void(const NodeType &, const BuildDependencies<NodeType> &,
-                       const BuildDynamicCallback<NodeType> &,
-                       const Context &)>;
-
-} // namespace sourcemeta::core
-
-#endif // SOURCEMETA_CORE_OPTIONS_H_
diff --git a/test/build/CMakeLists.txt b/test/build/CMakeLists.txt
deleted file mode 100644
index e97cc3363..000000000
--- a/test/build/CMakeLists.txt
+++ /dev/null
@@ -1,12 +0,0 @@
-sourcemeta_googletest(NAMESPACE sourcemeta PROJECT core NAME build
-  SOURCES
-    build_test_utils.h
-    build_adapter_filesystem_test.cc
-    build_adapter_filesystem_e2e_test.cc)
-
-target_link_libraries(sourcemeta_core_build_unit PRIVATE sourcemeta::core::build)
-
-target_compile_definitions(sourcemeta_core_build_unit
-  PRIVATE TEST_DIRECTORY="${CMAKE_CURRENT_SOURCE_DIR}")
-target_compile_definitions(sourcemeta_core_build_unit
-  PRIVATE BINARY_DIRECTORY="${CMAKE_CURRENT_BINARY_DIR}")
diff --git a/test/build/build_adapter_filesystem_e2e_test.cc b/test/build/build_adapter_filesystem_e2e_test.cc
deleted file mode 100644
index 1ddd318cd..000000000
--- a/test/build/build_adapter_filesystem_e2e_test.cc
+++ /dev/null
@@ -1,163 +0,0 @@
-#include <gtest/gtest.h>
-
-#include <sourcemeta/core/build.h>
-
-#include <cassert>
-#include <string>
-
-#include "build_test_utils.h"
-
-auto read_uint64_t(const std::filesystem::path &path) -> std::uint64_t {
-  return std::stoull(READ_FILE(path));
-}
-
-auto write_uint64_t(const std::filesystem::path &path,
-                    const std::uint64_t input) -> void {
-  WRITE_FILE(path, std::to_string(input));
-}
-
-template <typename Context, typename Adapter>
-auto HANDLER_MULTIPLY(
-    const typename Adapter::node_type &destination,
-    const sourcemeta::core::BuildDependencies<typename Adapter::node_type>
-        &dependencies,
-    const sourcemeta::core::BuildDynamicCallback<typename Adapter::node_type> &,
-    const Context &value) -> void {
-  assert(dependencies.size() == 1);
-  write_uint64_t(destination, read_uint64_t(dependencies.front()) * value);
-}
-
-template <typename Context, typename Adapter>
-auto HANDLER_MIRROR_CONTEXT_NODE(
-    const typename Adapter::node_type &destination,
-    const sourcemeta::core::BuildDependencies<typename Adapter::node_type> &,
-    const sourcemeta::core::BuildDynamicCallback<typename Adapter::node_type>
-        &callback,
-    const Context &context) -> void {
-  const auto input{read_uint64_t(context)};
-  callback(context);
-  write_uint64_t(destination, input);
-}
-
-template <typename Context, typename Adapter>
-auto HANDLER_MIRROR_CONTEXT_NODE_WITHOUT_CALLBACK(
-    const typename Adapter::node_type &destination,
-    const sourcemeta::core::BuildDependencies<typename Adapter::node_type> &,
-    const sourcemeta::core::BuildDynamicCallback<typename Adapter::node_type> &,
-    const Context &context) -> void {
-  const auto input{read_uint64_t(context)};
-  write_uint64_t(destination, input);
-}
-
-TEST(Build_Adapter_Filesystem_e2e, simple_cache_miss_hit) {
-  using Adapter = sourcemeta::core::BuildAdapterFilesystem;
-  using Context = std::uint64_t;
-  Adapter adapter;
-
-  const auto base_path{std::filesystem::path{BINARY_DIRECTORY} /
-                       "simple_cache_miss_hit"};
-  write_uint64_t(base_path / "initial.txt", 8);
-  EXPECT_EQ(read_uint64_t(base_path / "initial.txt"), 8);
-  adapter.refresh(base_path / "initial.txt");
-
-  // Create first.txt from initial.txt (cache miss)
-  const auto result_1 = sourcemeta::core::build<Context>(
-      adapter, HANDLER_MULTIPLY<Context, Adapter>, base_path / "first.txt",
-      {base_path / "initial.txt"}, 2);
-  EXPECT_TRUE(result_1);
-  EXPECT_EQ(read_uint64_t(base_path / "first.txt"), 16);
-
-  // Create second.txt from first.txt (cache miss)
-  const auto result_2 = sourcemeta::core::build<Context>(
-      adapter, HANDLER_MULTIPLY<Context, Adapter>, base_path / "second.txt",
-      {base_path / "first.txt"}, 3);
-  EXPECT_TRUE(result_2);
-  EXPECT_EQ(read_uint64_t(base_path / "second.txt"), 48);
-
-  // Create first.txt from initial.txt (cache hit)
-  const auto result_3 = sourcemeta::core::build<Context>(
-      adapter, HANDLER_MULTIPLY<Context, Adapter>, base_path / "first.txt",
-      {base_path / "initial.txt"}, 2);
-  EXPECT_FALSE(result_3);
-  EXPECT_EQ(read_uint64_t(base_path / "first.txt"), 16);
-
-  // Create second.txt from first.txt (cache hit)
-  const auto result_4 = sourcemeta::core::build<Context>(
-      adapter, HANDLER_MULTIPLY<Context, Adapter>, base_path / "second.txt",
-      {base_path / "first.txt"}, 3);
-  EXPECT_FALSE(result_4);
-  EXPECT_EQ(read_uint64_t(base_path / "second.txt"), 48);
-
-  // Update initial.txt
-  write_uint64_t(base_path / "initial.txt", 7);
-  EXPECT_EQ(read_uint64_t(base_path / "initial.txt"), 7);
-  adapter.refresh(base_path / "initial.txt");
-
-  // Create first.txt from initial.txt (cache miss)
-  const auto result_5 = sourcemeta::core::build<Context>(
-      adapter, HANDLER_MULTIPLY<Context, Adapter>, base_path / "first.txt",
-      {base_path / "initial.txt"}, 2);
-  EXPECT_TRUE(result_5);
-  EXPECT_EQ(read_uint64_t(base_path / "first.txt"), 14);
-
-  // Create second.txt from first.txt (cache miss)
-  const auto result_6 = sourcemeta::core::build<Context>(
-      adapter, HANDLER_MULTIPLY<Context, Adapter>, base_path / "second.txt",
-      {base_path / "first.txt"}, 3);
-  EXPECT_TRUE(result_6);
-  EXPECT_EQ(read_uint64_t(base_path / "second.txt"), 42);
-}
-
-TEST(Build_Adapter_Filesystem_e2e, dynamic_dependency) {
-  using Adapter = sourcemeta::core::BuildAdapterFilesystem;
-  using Context = Adapter::node_type;
-  Adapter adapter;
-
-  const auto base_path{std::filesystem::path{BINARY_DIRECTORY} /
-                       "dynamic_dependency"};
-  write_uint64_t(base_path / "initial.txt", 8);
-  EXPECT_EQ(read_uint64_t(base_path / "initial.txt"), 8);
-  adapter.refresh(base_path / "initial.txt");
-
-  // Create copy.txt from initial.txt (cache miss)
-  const auto result_1 = sourcemeta::core::build<Context>(
-      adapter, HANDLER_MIRROR_CONTEXT_NODE<Context, Adapter>,
-      base_path / "copy.txt", {}, base_path / "initial.txt");
-  EXPECT_TRUE(result_1);
-  EXPECT_EQ(read_uint64_t(base_path / "copy.txt"), 8);
-
-  // Create copy.txt from initial.txt (cache hit)
-  const auto result_2 = sourcemeta::core::build<Context>(
-      adapter, HANDLER_MIRROR_CONTEXT_NODE<Context, Adapter>,
-      base_path / "copy.txt", {}, base_path / "initial.txt");
-  // As the context was dynamically registered
-  EXPECT_FALSE(result_2);
-  EXPECT_EQ(read_uint64_t(base_path / "copy.txt"), 8);
-}
-
-TEST(Build_Adapter_Filesystem_e2e, missing_dynamic_dependency) {
-  using Adapter = sourcemeta::core::BuildAdapterFilesystem;
-  using Context = Adapter::node_type;
-  Adapter adapter;
-
-  const auto base_path{std::filesystem::path{BINARY_DIRECTORY} /
-                       "missing_dynamic_dependency"};
-  write_uint64_t(base_path / "initial.txt", 8);
-  EXPECT_EQ(read_uint64_t(base_path / "initial.txt"), 8);
-  adapter.refresh(base_path / "initial.txt");
-
-  // Create copy.txt from initial.txt (cache miss)
-  const auto result_1 = sourcemeta::core::build<Context>(
-      adapter, HANDLER_MIRROR_CONTEXT_NODE_WITHOUT_CALLBACK<Context, Adapter>,
-      base_path / "copy.txt", {}, base_path / "initial.txt");
-  EXPECT_TRUE(result_1);
-  EXPECT_EQ(read_uint64_t(base_path / "copy.txt"), 8);
-
-  // Create copy.txt from initial.txt (cache miss)
-  const auto result_2 = sourcemeta::core::build<Context>(
-      adapter, HANDLER_MIRROR_CONTEXT_NODE_WITHOUT_CALLBACK<Context, Adapter>,
-      base_path / "copy.txt", {}, base_path / "initial.txt");
-  // As the context was NOT dynamically registered
-  EXPECT_TRUE(result_2);
-  EXPECT_EQ(read_uint64_t(base_path / "copy.txt"), 8);
-}
diff --git a/test/build/build_adapter_filesystem_test.cc b/test/build/build_adapter_filesystem_test.cc
deleted file mode 100644
index 7540eabf3..000000000
--- a/test/build/build_adapter_filesystem_test.cc
+++ /dev/null
@@ -1,152 +0,0 @@
-#include <gtest/gtest.h>
-
-#include <sourcemeta/core/build.h>
-
-#include <fstream>
-
-#include "build_test_utils.h"
-
-TEST(Build_Adapter_Filesystem, dependencies_path) {
-  sourcemeta::core::BuildAdapterFilesystem adapter;
-  const auto result{adapter.dependencies_path("/foo/bar.baz")};
-  EXPECT_EQ(result, "/foo/bar.baz.deps");
-}
-
-TEST(Build_Adapter_Filesystem, dependencies_path_with_custom_extension) {
-  sourcemeta::core::BuildAdapterFilesystem adapter{".custom-deps"};
-  const auto result{adapter.dependencies_path("/foo/bar.baz")};
-  EXPECT_EQ(result, "/foo/bar.baz.custom-deps");
-}
-
-TEST(Build_Adapter_Filesystem, read_dependencies_stub_1) {
-  const std::filesystem::path stub{std::filesystem::path{TEST_DIRECTORY} /
-                                   "deps_stub_1.json"};
-  sourcemeta::core::BuildAdapterFilesystem adapter;
-  const auto dependencies{adapter.read_dependencies(stub)};
-  EXPECT_TRUE(dependencies.has_value());
-  EXPECT_EQ(dependencies.value().size(), 2);
-  auto iterator{dependencies.value().cbegin()};
-  EXPECT_EQ(iterator->string(), "/foo/bar");
-  std::advance(iterator, 1);
-  EXPECT_EQ(iterator->string(), "/test");
-}
-
-TEST(Build_Adapter_Filesystem, read_dependencies_not_exists) {
-  const std::filesystem::path stub{std::filesystem::path{TEST_DIRECTORY} /
-                                   "unknown"};
-  sourcemeta::core::BuildAdapterFilesystem adapter;
-  const auto dependencies{adapter.read_dependencies(stub)};
-  EXPECT_FALSE(dependencies.has_value());
-}
-
-TEST(Build_Adapter_Filesystem, write_dependencies_1) {
-  sourcemeta::core::BuildDependencies<
-      sourcemeta::core::BuildAdapterFilesystem::node_type>
-      dependencies;
-  dependencies.emplace_back("/foo/bar");
-  dependencies.emplace_back("/baz");
-  dependencies.emplace_back("/test");
-
-  const auto node{std::filesystem::path{BINARY_DIRECTORY} /
-                  "write_dependencies_1"};
-
-  WRITE_FILE(node, "test");
-
-  sourcemeta::core::BuildAdapterFilesystem adapter;
-  adapter.write_dependencies(node, dependencies);
-  const auto back{adapter.read_dependencies(node)};
-  EXPECT_TRUE(back.has_value());
-  EXPECT_EQ(back.value().size(), 3);
-
-  auto iterator{back.value().cbegin()};
-  EXPECT_EQ(iterator->string(), "/foo/bar");
-  std::advance(iterator, 1);
-  EXPECT_EQ(iterator->string(), "/baz");
-  std::advance(iterator, 1);
-  EXPECT_EQ(iterator->string(), "/test");
-}
-
-TEST(Build_Adapter_Filesystem, mark_stub_1) {
-  const std::filesystem::path stub{std::filesystem::path{TEST_DIRECTORY} /
-                                   "deps_stub_1.json.deps"};
-  sourcemeta::core::BuildAdapterFilesystem adapter;
-  const auto mark{adapter.mark(stub)};
-  EXPECT_TRUE(mark.has_value());
-}
-
-TEST(Build_Adapter_Filesystem, mark_stub_not_exists) {
-  const std::filesystem::path stub{std::filesystem::path{TEST_DIRECTORY} /
-                                   "unknown"};
-  sourcemeta::core::BuildAdapterFilesystem adapter;
-  const auto mark{adapter.mark(stub)};
-  EXPECT_FALSE(mark.has_value());
-}
-
-TEST(Build_Adapter_Filesystem, is_newer_than_same_with_refresh) {
-  const std::filesystem::path file{std::filesystem::path{BINARY_DIRECTORY} /
-                                   "is_newer_than_same"};
-  sourcemeta::core::BuildAdapterFilesystem adapter;
-  WRITE_FILE(file, "test");
-  adapter.refresh(file);
-  const auto mark{adapter.mark(file)};
-  EXPECT_TRUE(mark.has_value());
-  EXPECT_FALSE(adapter.is_newer_than(mark.value(), mark.value()));
-}
-
-TEST(Build_Adapter_Filesystem, is_newer_than_same_without_refresh) {
-  const std::filesystem::path file{std::filesystem::path{BINARY_DIRECTORY} /
-                                   "is_newer_than_same"};
-  WRITE_FILE(file, "test");
-  sourcemeta::core::BuildAdapterFilesystem adapter;
-  const auto mark{adapter.mark(file)};
-  EXPECT_TRUE(mark.has_value());
-  EXPECT_FALSE(adapter.is_newer_than(mark.value(), mark.value()));
-}
-
-TEST(Build_Adapter_Filesystem, is_newer_than) {
-  const std::filesystem::path file_1{std::filesystem::path{BINARY_DIRECTORY} /
-                                     "is_newer_than" / "1.txt"};
-  const std::filesystem::path file_2{std::filesystem::path{BINARY_DIRECTORY} /
-                                     "is_newer_than" / "2.txt"};
-
-  sourcemeta::core::BuildAdapterFilesystem adapter;
-
-  WRITE_FILE(file_1, "test_1");
-  adapter.refresh(file_1);
-  WRITE_FILE(file_2, "test_2");
-  adapter.refresh(file_2);
-
-  const auto mark_1{adapter.mark(file_1)};
-  const auto mark_2{adapter.mark(file_2)};
-
-  EXPECT_TRUE(mark_1.has_value());
-  EXPECT_TRUE(mark_2.has_value());
-
-  EXPECT_FALSE(adapter.is_newer_than(mark_1.value(), mark_2.value()));
-  EXPECT_TRUE(adapter.is_newer_than(mark_2.value(), mark_1.value()));
-}
-
-TEST(Build_Adapter_Filesystem, is_newer_than_with_update) {
-  const std::filesystem::path file_1{std::filesystem::path{BINARY_DIRECTORY} /
-                                     "is_newer_than_with_update" / "1.txt"};
-  const std::filesystem::path file_2{std::filesystem::path{BINARY_DIRECTORY} /
-                                     "is_newer_than_with_update" / "2.txt"};
-
-  sourcemeta::core::BuildAdapterFilesystem adapter;
-
-  WRITE_FILE(file_1, "test_1");
-  adapter.refresh(file_1);
-  WRITE_FILE(file_2, "test_2");
-  adapter.refresh(file_2);
-  WRITE_FILE(file_1, "test_3");
-  adapter.refresh(file_1);
-
-  const auto mark_1{adapter.mark(file_1)};
-  const auto mark_2{adapter.mark(file_2)};
-
-  EXPECT_TRUE(mark_1.has_value());
-  EXPECT_TRUE(mark_2.has_value());
-
-  EXPECT_TRUE(adapter.is_newer_than(mark_1.value(), mark_2.value()));
-  EXPECT_FALSE(adapter.is_newer_than(mark_2.value(), mark_1.value()));
-}
diff --git a/test/build/build_test_utils.h b/test/build/build_test_utils.h
deleted file mode 100644
index a24072c2a..000000000
--- a/test/build/build_test_utils.h
+++ /dev/null
@@ -1,25 +0,0 @@
-#ifndef SOURCEMETA_CORE_BUILD_TEST_UTILSH_
-#define SOURCEMETA_CORE_BUILD_TEST_UTILSH_
-
-#include <cassert>
-#include <fstream>
-#include <string>
-
-inline auto READ_FILE(const std::filesystem::path &path) -> std::string {
-  std::ifstream stream{path};
-  std::ostringstream buffer;
-  buffer << stream.rdbuf();
-  return buffer.str();
-}
-
-inline auto WRITE_FILE(const std::filesystem::path &path,
-                       const std::string &contents) -> void {
-  std::filesystem::create_directories(path.parent_path());
-  std::ofstream stream{path};
-  assert(!stream.fail());
-  stream << contents;
-  stream.flush();
-  stream.close();
-}
-
-#endif
diff --git a/test/build/deps_stub_1.json.deps b/test/build/deps_stub_1.json.deps
deleted file mode 100644
index c9d771195..000000000
--- a/test/build/deps_stub_1.json.deps
+++ /dev/null
@@ -1,2 +0,0 @@
-/foo/bar
-/test
diff --git a/test/packaging/find_package/CMakeLists.txt b/test/packaging/find_package/CMakeLists.txt
index ff2246fcc..9f65a6d59 100644
--- a/test/packaging/find_package/CMakeLists.txt
+++ b/test/packaging/find_package/CMakeLists.txt
@@ -23,4 +23,3 @@ target_link_libraries(core_hello PRIVATE sourcemeta::core::html)
 target_link_libraries(core_hello PRIVATE sourcemeta::core::alterschema)
 target_link_libraries(core_hello PRIVATE sourcemeta::core::editorschema)
 target_link_libraries(core_hello PRIVATE sourcemeta::core::options)
-target_link_libraries(core_hello PRIVATE sourcemeta::core::build)
diff --git a/test/packaging/find_package/hello.cc b/test/packaging/find_package/hello.cc
index ecabe3932..1b96457bb 100644
--- a/test/packaging/find_package/hello.cc
+++ b/test/packaging/find_package/hello.cc
@@ -1,5 +1,4 @@
 #include <sourcemeta/core/alterschema.h>
-#include <sourcemeta/core/build.h>
 #include <sourcemeta/core/crypto.h>
 #include <sourcemeta/core/editorschema.h>
 #include <sourcemeta/core/html.h>