From https://github.com/winterheart/aseprite/tree/v1.3.16.1-unbundle
--- a/laf/cmake/FindSkia.cmake
+++ b/laf/cmake/FindSkia.cmake
@@ -172,18 +172,13 @@ if(NOT PNG_LIBRARIES)
   set(PNG_INCLUDE_DIRS "${SKIA_DIR}/third_party/externals/libpng")
 endif()
 
-set(FREETYPE_FOUND ON)
-find_library(FREETYPE_LIBRARY freetype2 PATH "${SKIA_LIBRARY_DIR}" NO_DEFAULT_PATH)
-set(FREETYPE_LIBRARIES ${FREETYPE_LIBRARY})
-set(FREETYPE_INCLUDE_DIRS "${SKIA_DIR}/third_party/externals/freetype/include")
-
-find_library(HARFBUZZ_LIBRARY harfbuzz PATH "${SKIA_LIBRARY_DIR}" NO_DEFAULT_PATH)
-set(HARFBUZZ_LIBRARIES ${HARFBUZZ_LIBRARY})
-set(HARFBUZZ_INCLUDE_DIRS "${SKIA_DIR}/third_party/externals/harfbuzz/src")
-
 set(SKIA_LIBRARIES
   ${SKIA_LIBRARY}
   ${SKIA_OPENGL_LIBRARY}
+  ${FREETYPE_LIBRARIES}
+  ${HARFBUZZ_LIBRARIES}
+  ${PNG_LIBRARIES}
+  ${WEBP_LIBRARIES}
   CACHE INTERNAL "Skia libraries")
 
 add_library(skia INTERFACE)
@@ -191,6 +186,8 @@ target_include_directories(skia INTERFACE
   ${SKIA_DIR}
   ${FREETYPE_INCLUDE_DIRS}
   ${HARFBUZZ_INCLUDE_DIRS}
+  ${PNG_INCLUDE_DIRS}
+  ${WEBP_INCLUDE_DIRS}
   ${PNG_INCLUDE_DIRS})
 target_link_libraries(skia INTERFACE ${SKIA_LIBRARIES})
 target_compile_definitions(skia INTERFACE