vcpkg/ports/opencv3/0004-use-find-package-required.patch

--- a/cmake/OpenCVFindLibsGrfmt.cmake
+++ b/cmake/OpenCVFindLibsGrfmt.cmake
@@ -6,7 +6,7 @@
 if(BUILD_ZLIB)
   ocv_clear_vars(ZLIB_FOUND)
 else()
-  find_package(ZLIB "${MIN_VER_ZLIB}")
+  find_package(ZLIB "${MIN_VER_ZLIB}" REQUIRED)
   if(ZLIB_FOUND AND ANDROID)
     if(ZLIB_LIBRARIES MATCHES "/usr/(lib|lib32|lib64)/libz.so$")
       set(ZLIB_LIBRARIES z)
@@ -30,7 +30,7 @@ if(WITH_JPEG)
   if(BUILD_JPEG)
     ocv_clear_vars(JPEG_FOUND)
   else()
-    include(FindJPEG)
+    find_package(JPEG REQUIRED)
   endif()

   if(NOT JPEG_FOUND)
@@ -51,7 +51,7 @@ if(WITH_TIFF)
   if(BUILD_TIFF)
     ocv_clear_vars(TIFF_FOUND)
   else()
-    include(FindTIFF)
+    find_package(TIFF REQUIRED)
     if(TIFF_FOUND)
       ocv_parse_header("${TIFF_INCLUDE_DIR}/tiff.h" TIFF_VERSION_LINES TIFF_VERSION_CLASSIC TIFF_VERSION_BIG TIFF_VERSION TIFF_BIGTIFF_VERSION)
     endif()
@@ -94,7 +94,7 @@ if(WITH_WEBP)
   if(BUILD_WEBP)
     ocv_clear_vars(WEBP_FOUND WEBP_LIBRARY WEBP_LIBRARIES WEBP_INCLUDE_DIR)
   else()
-    include(cmake/OpenCVFindWebP.cmake)
+    find_package(WebP REQUIRED)
     if(WEBP_FOUND)
       set(HAVE_WEBP 1)
     endif()
@@ -135,7 +135,7 @@ if(WITH_JASPER)
   if(BUILD_JASPER)
     ocv_clear_vars(JASPER_FOUND)
   else()
-    include(FindJasper)
+    find_package(Jasper REQUIRED)
   endif()

   if(NOT JASPER_FOUND)
@@ -159,7 +159,7 @@ if(WITH_PNG)
   if(BUILD_PNG)
     ocv_clear_vars(PNG_FOUND)
   else()
-    include(FindPNG)
+    find_package(PNG REQUIRED)
     if(PNG_FOUND)
       include(CheckIncludeFile)
       check_include_file("${PNG_PNG_INCLUDE_DIR}/libpng/png.h" HAVE_LIBPNG_PNG_H)
@@ -191,7 +191,7 @@ if(WITH_OPENEXR)
   if(BUILD_OPENEXR)
     ocv_clear_vars(OPENEXR_FOUND)
   else()
-    include("${OpenCV_SOURCE_DIR}/cmake/OpenCVFindOpenEXR.cmake")
+    find_package(OpenEXR REQUIRED)
   endif()

   if(NOT OPENEXR_FOUND)
@@ -207,7 +207,7 @@ endif()

 # --- GDAL (optional) ---
 if(WITH_GDAL)
-    find_package(GDAL QUIET)
+    find_package(GDAL REQUIRED)

     if(NOT GDAL_FOUND)
         set(HAVE_GDAL NO)
@@ -219,7 +219,7 @@ if(WITH_GDAL)
 endif()

 if (WITH_GDCM)
-  find_package(GDCM QUIET)
+  find_package(GDCM REQUIRED)
   if(NOT GDCM_FOUND)
     set(HAVE_GDCM NO)
     ocv_clear_vars(GDCM_VERSION GDCM_LIBRARIES)