vcpkg/ports/dlib/force_finding_packages.patch

--- a/dlib/CMakeLists.txt
+++ b/dlib/CMakeLists.txt
@@ -430,70 +430,9 @@
       endif()
 
       if (DLIB_PNG_SUPPORT)
-         # try to find libpng 
-         find_package(PNG QUIET)
-         # Make sure there isn't something wrong with the version of LIBPNG
-         # installed on this system.  Also never link to anything from anaconda
-         # since it's probably broken.
-         if (PNG_FOUND AND NOT ("${PNG_INCLUDE_DIR}" MATCHES "(.*)(Ana|ana|mini)conda(.*)") AND NOT BUILDING_PYTHON_IN_MSVC)
-            set(CMAKE_REQUIRED_LIBRARIES ${PNG_LIBRARIES})
-            CHECK_FUNCTION_EXISTS(png_create_read_struct LIBPNG_IS_GOOD)
-         endif()
-         if (PNG_FOUND AND LIBPNG_IS_GOOD)
-            include_directories(${PNG_INCLUDE_DIR})
-            set (dlib_needed_libraries ${dlib_needed_libraries} ${PNG_LIBRARIES})
-            set(REQUIRES_LIBS " libpng")
-         else()
-            # If we can't find libpng then statically compile it in.
-            include_directories(external/libpng external/zlib)
-            set(source_files ${source_files}
-               external/libpng/arm/arm_init.c
-               external/libpng/arm/filter_neon_intrinsics.c
-               external/libpng/png.c
-               external/libpng/pngerror.c
-               external/libpng/pngget.c
-               external/libpng/pngmem.c
-               external/libpng/pngpread.c
-               external/libpng/pngread.c
-               external/libpng/pngrio.c
-               external/libpng/pngrtran.c
-               external/libpng/pngrutil.c
-               external/libpng/pngset.c
-               external/libpng/pngtrans.c
-               external/libpng/pngwio.c
-               external/libpng/pngwrite.c
-               external/libpng/pngwtran.c
-               external/libpng/pngwutil.c
-               external/zlib/adler32.c
-               external/zlib/compress.c
-               external/zlib/crc32.c
-               external/zlib/deflate.c
-               external/zlib/gzclose.c
-               external/zlib/gzlib.c
-               external/zlib/gzread.c
-               external/zlib/gzwrite.c
-               external/zlib/infback.c
-               external/zlib/inffast.c
-               external/zlib/inflate.c
-               external/zlib/inftrees.c
-               external/zlib/trees.c
-               external/zlib/uncompr.c
-               external/zlib/zutil.c
-               )
-
-            include(cmake_utils/check_if_neon_available.cmake)
-            if (ARM_NEON_IS_AVAILABLE)
-               message (STATUS "NEON instructions will be used for libpng.")
-               enable_language(ASM)
-               set(source_files ${source_files}
-                  external/libpng/arm/arm_init.c
-                  external/libpng/arm/filter_neon_intrinsics.c
-                  external/libpng/arm/filter_neon.S
-                  )
-               set_source_files_properties(external/libpng/arm/filter_neon.S PROPERTIES COMPILE_FLAGS "${CMAKE_ASM_FLAGS} ${CMAKE_CXX_FLAGS} -x assembler-with-cpp")
-            endif()
-            set(REQUIRES_LIBS "")
-         endif()
+         find_package(PNG REQUIRED)
+         include_directories(${PNG_INCLUDE_DIR})
+         set (dlib_needed_libraries ${dlib_needed_libraries} ${PNG_LIBRARIES})
          set(source_files ${source_files}
             image_loader/png_loader.cpp
             image_saver/save_png.cpp
@@ -501,68 +440,8 @@
       endif()
 
       if (DLIB_JPEG_SUPPORT)
-         # try to find libjpeg 
-         find_package(JPEG QUIET)
-         # Make sure there isn't something wrong with the version of libjpeg 
-         # installed on this system.  Also don't use the installed libjpeg
-         # if this is an APPLE system because apparently it's broken (as of 2015/01/01).
-         if (JPEG_FOUND AND NOT ("${JPEG_INCLUDE_DIR}" MATCHES "(.*)(Ana|ana|mini)conda(.*)") AND NOT BUILDING_PYTHON_IN_MSVC)
-            set(CMAKE_REQUIRED_LIBRARIES ${JPEG_LIBRARY})
-            CHECK_FUNCTION_EXISTS(jpeg_read_header LIBJPEG_IS_GOOD)
-         endif()
-         if (JPEG_FOUND AND LIBJPEG_IS_GOOD)
-            include_directories(${JPEG_INCLUDE_DIR})
-            set (dlib_needed_libraries ${dlib_needed_libraries} ${JPEG_LIBRARY})
-         else()
-            # If we can't find libjpeg then statically compile it in.
-            add_definitions(-DDLIB_JPEG_STATIC)
-            set(source_files ${source_files}
-               external/libjpeg/jcomapi.cpp
-               external/libjpeg/jdapimin.cpp
-               external/libjpeg/jdapistd.cpp
-               external/libjpeg/jdatasrc.cpp
-               external/libjpeg/jdcoefct.cpp
-               external/libjpeg/jdcolor.cpp
-               external/libjpeg/jddctmgr.cpp
-               external/libjpeg/jdhuff.cpp
-               external/libjpeg/jdinput.cpp
-               external/libjpeg/jdmainct.cpp
-               external/libjpeg/jdmarker.cpp
-               external/libjpeg/jdmaster.cpp
-               external/libjpeg/jdmerge.cpp
-               external/libjpeg/jdphuff.cpp
-               external/libjpeg/jdpostct.cpp
-               external/libjpeg/jdsample.cpp
-               external/libjpeg/jerror.cpp
-               external/libjpeg/jidctflt.cpp
-               external/libjpeg/jidctfst.cpp
-               external/libjpeg/jidctint.cpp
-               external/libjpeg/jidctred.cpp
-               external/libjpeg/jmemmgr.cpp
-               external/libjpeg/jmemnobs.cpp
-               external/libjpeg/jquant1.cpp
-               external/libjpeg/jquant2.cpp
-               external/libjpeg/jutils.cpp  
-               external/libjpeg/jcapimin.cpp
-               external/libjpeg/jdatadst.cpp
-               external/libjpeg/jcparam.cpp
-               external/libjpeg/jcapistd.cpp
-               external/libjpeg/jcmarker.cpp
-               external/libjpeg/jcinit.cpp
-               external/libjpeg/jcmaster.cpp
-               external/libjpeg/jcdctmgr.cpp
-               external/libjpeg/jccoefct.cpp  
-               external/libjpeg/jccolor.cpp  
-               external/libjpeg/jchuff.cpp  
-               external/libjpeg/jcmainct.cpp  
-               external/libjpeg/jcphuff.cpp  
-               external/libjpeg/jcprepct.cpp  
-               external/libjpeg/jcsample.cpp
-               external/libjpeg/jfdctint.cpp
-               external/libjpeg/jfdctflt.cpp
-               external/libjpeg/jfdctfst.cpp
-               )
-         endif()
+         find_package(JPEG REQUIRED)
+         include_directories(${JPEG_INCLUDE_DIR})
          set(source_files ${source_files}
             image_loader/jpeg_loader.cpp
             image_saver/save_jpeg.cpp