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+---
+name: dev-cmake
+description: Write CMake and Make files like a principal engineer with decades of experience. Use when creating, refactoring, reviewing, or debugging CMakeLists.txt, Makefiles, or build system configurations for C/C++ projects. Produces elegant, minimal, modern build files that reflect deep understanding of build systems.
+---
+
+# CMake & Make Expert
+
+Write build files that are elegant because the understanding is deep. Every line should have a reason. Simplicity comes from mastery, not shortcuts.
+
+## Core Philosophy
+
+**Targets are everything.** Modern CMake is about targets and properties, not variables and directories. Think of targets as objects with member functions and properties.
+
+**Explicit over implicit.** Always specify `PRIVATE`, `PUBLIC`, or `INTERFACE`. Never rely on inherited directory-level settings.
+
+**Minimal surface area.** Expose only what consumers need. Default to `PRIVATE`; use `PUBLIC` only when downstream targets genuinely require it.
+
+## CMake: The Principal Engineer Approach
+
+### Project Structure
+```cmake
+cmake_minimum_required(VERSION 3.16)
+project(MyProject VERSION 1.0.0 LANGUAGES CXX)
+
+# Set standards at target level, not globally
+# Use compile features, not flags
+```
+
+### Target Definition Pattern
+```cmake
+add_library(mylib)
+add_library(MyProject::mylib ALIAS mylib)
+
+target_sources(mylib
+    PRIVATE
+        src/impl.cpp
+    PUBLIC
+        FILE_SET HEADERS
+        BASE_DIRS include
+        FILES include/mylib/api.h
+)
+
+target_compile_features(mylib PUBLIC cxx_std_17)
+
+target_include_directories(mylib
+    PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+        $<INSTALL_INTERFACE:include>
+)
+```
+
+### What to Never Do
+- `include_directories()` — use `target_include_directories()`
+- `link_directories()` — use full paths or targets
+- `add_definitions()` — use `target_compile_definitions()`
+- `link_libraries()` — use `target_link_libraries()`
+- `CMAKE_CXX_FLAGS` manipulation — use `target_compile_options()` or features
+- `file(GLOB)` for sources — list files explicitly
+- Bare library names in `target_link_libraries()` — use namespaced targets
+
+### Dependency Handling
+
+For find_package dependencies:
+```cmake
+find_package(Boost 1.70 REQUIRED COMPONENTS filesystem)
+target_link_libraries(mylib PRIVATE Boost::filesystem)
+```
+
+For FetchContent (prefer over ExternalProject for CMake deps):
+```cmake
+include(FetchContent)
+FetchContent_Declare(fmt
+    GIT_REPOSITORY https://github.com/fmtlib/fmt.git
+    GIT_TAG 10.1.0
+)
+FetchContent_MakeAvailable(fmt)
+target_link_libraries(mylib PRIVATE fmt::fmt)
+```
+
+### Generator Expressions
+
+Use for build/install path differences:
+```cmake
+target_include_directories(mylib PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:include>
+)
+```
+
+Use for conditional compilation:
+```cmake
+target_compile_definitions(mylib PRIVATE
+    $<$<CONFIG:Debug>:DEBUG_MODE>
+)
+```
+
+## Make: The Principal Engineer Approach
+
+### Essential Structure
+```makefile
+# Immediately expanded defaults
+CC      ?= gcc
+CXX     ?= g++
+CFLAGS  ?= -Wall -Wextra -pedantic
+LDFLAGS ?=
+
+# Preserve user-provided flags
+CFLAGS  += -MMD -MP
+
+# Automatic dependency tracking
+SRCS := $(wildcard src/*.c)
+OBJS := $(SRCS:src/%.c=build/%.o)
+DEPS := $(OBJS:.o=.d)
+
+.PHONY: all clean
+
+all: bin/program
+
+bin/program: $(OBJS) | bin
+	$(CC) $(LDFLAGS) -o $@ $^
+
+build/%.o: src/%.c | build
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+bin build:
+	mkdir -p $@
+
+clean:
+	rm -rf build bin
+
+-include $(DEPS)
+```
+
+### Pattern Rules — The Elegant Way
+```makefile
+# Single pattern rule replaces N explicit rules
+%.o: %.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
+```
+
+### Automatic Variables (memorize these)
+- `$@` — target
+- `$<` — first prerequisite
+- `$^` — all prerequisites (no duplicates)
+- `$+` — all prerequisites (with duplicates, for libs)
+- `$*` — stem (matched by %)
+
+### What Makes Makefiles Elegant
+1. Order-only prerequisites (`| dir`) for directory creation
+2. `-include` for optional dependency files
+3. `?=` for overridable defaults, `+=` to append
+4. `.PHONY` for non-file targets
+5. `.DELETE_ON_ERROR` to clean failed builds
+6. Consistent variable naming (UPPERCASE for user-facing)
+
+## Reference Files
+
+- **references/cmake-patterns.md** — Complete modern CMake patterns (library export, install, presets, toolchains)
+- **references/make-patterns.md** — Advanced Make patterns (multi-directory, cross-compilation, dependencies)
+- **references/antipatterns.md** — Common mistakes and their fixes
+
+## Quality Checklist
+
+Before finalizing any build file:
+
+### CMake
+- [ ] Every target has a namespaced alias
+- [ ] All `target_*` calls specify scope (`PRIVATE`/`PUBLIC`/`INTERFACE`)
+- [ ] No directory-level commands (`include_directories`, etc.)
+- [ ] Generator expressions for build/install differences
+- [ ] Version requirements on `find_package`
+- [ ] `cmake_minimum_required` reflects actual features used
+
+### Make
+- [ ] All variables use `?=` or `+=` appropriately
+- [ ] Automatic dependency generation (`-MMD -MP`)
+- [ ] Pattern rules instead of repeated explicit rules
+- [ ] `.PHONY` declared for non-file targets
+- [ ] Clean target removes all generated files
+- [ ] Build artifacts in separate directory from source
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+cmake_minimum_required(VERSION 3.16)
+project(MyLibrary
+    VERSION 1.0.0
+    DESCRIPTION "A well-structured C++ library"
+    LANGUAGES CXX
+)
+
+# ============================================================================
+# Options
+# ============================================================================
+option(MYLIB_BUILD_TESTS "Build unit tests" OFF)
+option(MYLIB_BUILD_EXAMPLES "Build examples" OFF)
+
+# ============================================================================
+# Library Target
+# ============================================================================
+add_library(mylib)
+add_library(${PROJECT_NAME}::mylib ALIAS mylib)
+
+target_sources(mylib
+    PRIVATE
+        src/mylib.cpp
+    # PUBLIC headers via FILE_SET (CMake 3.23+) or target_include_directories
+)
+
+target_compile_features(mylib PUBLIC cxx_std_17)
+
+target_include_directories(mylib
+    PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+    PRIVATE
+        ${CMAKE_CURRENT_SOURCE_DIR}/src
+)
+
+# Uncomment and modify for dependencies:
+# find_package(fmt REQUIRED)
+# target_link_libraries(mylib PUBLIC fmt::fmt)
+
+target_compile_options(mylib
+    PRIVATE
+        $<$<CXX_COMPILER_ID:GNU,Clang>:-Wall -Wextra -Wpedantic>
+        $<$<CXX_COMPILER_ID:MSVC>:/W4>
+)
+
+set_target_properties(mylib PROPERTIES
+    VERSION ${PROJECT_VERSION}
+    SOVERSION ${PROJECT_VERSION_MAJOR}
+    CXX_VISIBILITY_PRESET hidden
+    VISIBILITY_INLINES_HIDDEN ON
+)
+
+# ============================================================================
+# Installation
+# ============================================================================
+include(GNUInstallDirs)
+include(CMakePackageConfigHelpers)
+
+install(TARGETS mylib
+    EXPORT ${PROJECT_NAME}Targets
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+)
+
+install(DIRECTORY include/
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+)
+
+install(EXPORT ${PROJECT_NAME}Targets
+    FILE ${PROJECT_NAME}Targets.cmake
+    NAMESPACE ${PROJECT_NAME}::
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+)
+
+configure_package_config_file(
+    ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+)
+
+write_basic_package_version_file(
+    ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY SameMajorVersion
+)
+
+install(FILES
+    ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+    ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+)
+
+# ============================================================================
+# Testing
+# ============================================================================
+if(MYLIB_BUILD_TESTS)
+    enable_testing()
+    add_subdirectory(tests)
+endif()