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Upstream-status: https://github.com/dolphin-emu/dolphin/pull/13823
diff --git a/CMake/DolphinLibraryTools.cmake b/CMake/DolphinLibraryTools.cmake
index 4c395a8ef9..fb806b1b90 100644
--- a/CMake/DolphinLibraryTools.cmake
+++ b/CMake/DolphinLibraryTools.cmake
@@ -92,3 +92,30 @@ function(dolphin_find_optional_system_library_pkgconfig library search alias bun
set(${library}_TYPE "Bundled" PARENT_SCOPE)
endif()
endfunction()
+
+# This can be used for header-only libraries that doesn't offer a
+# pkg-config or CMake file. It uses CMake's find_file. LIBRARY is the
+# name of the library providing it, INCLUDE is the header file name
+# without its installation prefix (e.g. "wtr/watcher.hpp") while
+# BUNDLED_PATH is the root directory of the bundled library.
+function(dolphin_find_optional_system_include library include bundled_path)
+ dolphin_optional_system_library(use_system ${library})
+ string(TOUPPER ${library} upperlib)
+ if(use_system)
+ find_file(${library}_INCLUDE ${include})
+ if((NOT ${library}_INCLUDE) AND (NOT ${use_system} STREQUAL "AUTO"))
+ message(FATAL_ERROR "No system ${library} headers found. \
+Please install it or set USE_SYSTEM_${upperlib} to AUTO or OFF.")
+ endif()
+ endif()
+ if(${library}_INCLUDE)
+ message(STATUS "Using system ${library} headers")
+ set(${library}_TYPE "System" PARENT_SCOPE)
+ add_library(${library} INTERFACE IMPORTED GLOBAL)
+ set_target_properties(${library} PROPERTIES
+ INTERFACE_INCLUDE_DIRECTORIES ${${library}_INCLUDE})
+ else()
+ dolphin_add_bundled_library(${library} ${use_system} ${bundled_path})
+ set(${library}_TYPE "Bundled" PARENT_SCOPE)
+ endif()
+endfunction()
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c277e2a10a..12b1c36ef0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -786,7 +786,7 @@ if (USE_RETRO_ACHIEVEMENTS)
add_subdirectory(Externals/rcheevos)
endif()
-add_subdirectory(Externals/watcher)
+dolphin_find_optional_system_include(watcher wtr/watcher.hpp Externals/watcher)
########################################
# Pre-build events: Define configuration variables and write SCM info header
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