vcpkg/ports/openmvg/build_fixes.patch

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9cfd06c..8859469 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -14,6 +14,7 @@ if (${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
   message(FATAL_ERROR "In-source builds not allowed.")
 endif()
 
+if(0)
 # ==============================================================================
 # OpenMVG build options
 # ==============================================================================
@@ -31,7 +32,7 @@ option(OpenMVG_USE_OPENMP "Enable OpenMP parallelization" ON)
 #  and openMVG simultaneously
 # ==============================================================================
 option(OpenMVG_USE_OPENCV "Build or not opencv+openMVG samples programs" OFF)
-
+endif()
 # ==============================================================================
 # Since OpenCV 3, SIFT is no longer in the default modules. See
 # https://github.com/itseez/opencv_contrib for more informations.
@@ -85,6 +86,7 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   register_definitions(-DOPENMVG_STD_UNORDERED_MAP)
 endif()
 
+if(0)
 # ==============================================================================
 # Check that submodule have been initialized and updated
 # ==============================================================================
@@ -93,6 +95,7 @@ if (NOT EXISTS ${PROJECT_SOURCE_DIR}/dependencies/cereal/include)
     "\n submodule(s) are missing, please update your repository:\n"
     "  > git submodule update -i\n")
 endif()
+endif()
 
 # ==============================================================================
 # Additional cmake find modules
@@ -128,7 +131,6 @@ if (OpenMVG_USE_OPENMP)
   find_package(OpenMP)
   if (OPENMP_FOUND)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
-    option(OpenMVG_USE_OPENMP "Use OpenMP for parallelization" ON)
     register_definitions(-DOPENMVG_USE_OPENMP)
     if (NOT MSVC)
       if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
@@ -139,11 +141,6 @@ if (OpenMVG_USE_OPENMP)
       endif()
     endif (NOT MSVC)
   endif (OPENMP_FOUND)
-else (OpenMVG_USE_OPENMP)
-    option(OpenMVG_USE_OPENMP "Use OpenMP for parallelization" OFF)
-    include(UpdateCacheVariable)
-    UPDATE_CACHE_VARIABLE(OpenMVG_USE_OPENMP OFF)
-    remove_definitions(-DOPENMVG_USE_OPENMP)
 endif (OpenMVG_USE_OPENMP)
 
 # ==============================================================================
@@ -160,10 +157,10 @@ endif()
 # ==============================================================================
 # IMAGE IO detection
 # ==============================================================================
-find_package(JPEG QUIET)
-find_package(PNG QUIET)
-find_package(TIFF QUIET)
-
+find_package(JPEG REQUIRED)
+find_package(PNG REQUIRED)
+find_package(TIFF REQUIRED)
+find_package(vlfeat REQUIRED)
 # Folders
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 
@@ -182,6 +179,7 @@ if (OpenMVG_BUILD_OPENGL_EXAMPLES)
   set_property(TARGET glfw PROPERTY FOLDER OpenMVG/3rdParty/glfw)
 endif (OpenMVG_BUILD_OPENGL_EXAMPLES)
 
+if(0)
 # Dependencies install rules
 install(
   DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/dependencies/
@@ -189,7 +187,7 @@ install(
   COMPONENT headers
   FILES_MATCHING PATTERN "*.hpp" PATTERN "*.h"
 )
-
+endif()
 # ==============================================================================
 # --END-- SUBMODULE CONFIGURATION
 # ==============================================================================
@@ -225,6 +223,7 @@ ENDMACRO(UNIT_TEST)
 # - external by default
 # - internal if cereal not found
 # ==============================================================================
+if(0)
 find_package(cereal QUIET CONFIG)
 if (NOT TARGET cereal)
   add_library(cereal INTERFACE)
@@ -237,6 +236,10 @@ if (NOT TARGET cereal)
 
   set(OpenMVG_USE_INTERNAL_CEREAL ON)
 endif()
+endif()
+
+find_package(cereal REQUIRED CONFIG)
+get_target_property(CEREAL_INCLUDE_DIRS cereal INTERFACE_INCLUDE_DIRECTORIES)
 
 # ==============================================================================
 # Eigen
@@ -245,6 +248,7 @@ endif()
 # - external if EIGEN_INCLUDE_DIR_HINTS is defined
 # - internal if Eigen not found
 # ==============================================================================
+if(0)
 find_package(Eigen3 QUIET)
 if (NOT Eigen3_FOUND)
   set(EIGEN_INCLUDE_DIR_HINTS ${CMAKE_CURRENT_SOURCE_DIR}/third_party/eigen)
@@ -253,13 +257,17 @@ if (NOT Eigen3_FOUND)
 else()
   set(EIGEN_INCLUDE_DIRS ${EIGEN3_INCLUDE_DIR})
 endif()
+endif()
 
+find_package(Eigen3 REQUIRED)
+set(EIGEN_INCLUDE_DIRS ${EIGEN3_INCLUDE_DIR})
 # ==============================================================================
 # Ceres
 # ==============================================================================
 # - external by default if CERES_DIR_HINTS or find_package found a valid Ceres
 # - internal if ceres not found (ceres-solver+cxsparse+miniglog)
 # ==============================================================================
+if(0)
 find_package(Ceres QUIET HINTS ${CERES_DIR_HINTS})
 if (NOT Ceres_FOUND)
   set(OpenMVG_USE_INTERNAL_CERES ON)
@@ -271,13 +279,16 @@ if (NOT Ceres_FOUND)
     STRING(REGEX REPLACE "version ([0-9.]+).*" "\\1" CERES_VERSION ${CERES_CONFIG})
   set(CERES_LIBRARIES openMVG_ceres)
 endif()
+endif()
 
+find_package(Ceres REQUIRED)
 # ==============================================================================
 # Flann
 # ==============================================================================
 # - internal by default (flann),
 # - external if FLANN_INCLUDE_DIR_HINTS and a valid Flann setup is found
 # ==============================================================================
+if(0)
 if (NOT DEFINED FLANN_INCLUDE_DIR_HINTS)
   set(FLANN_INCLUDE_DIR_HINTS ${CMAKE_CURRENT_SOURCE_DIR}/third_party/flann/src/cpp)
   set(OpenMVG_USE_INTERNAL_FLANN ON)
@@ -286,13 +297,16 @@ find_package(Flann QUIET)
 if (NOT FLANN_FOUND OR OpenMVG_USE_INTERNAL_FLANN)
   set(FLANN_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/third_party/flann/src/cpp)
 endif()
+endif()
 
+find_package(flann REQUIRED)
 # ==============================================================================
 # CoinUtils
 # ==============================================================================
 # - internal by default (CoinUtils),
 # - external if COINUTILS_INCLUDE_DIR_HINTS and a valid CoinUtils setup is found
 # ==============================================================================
+if(0)
 if (NOT DEFINED COINUTILS_INCLUDE_DIR_HINTS)
   set(COINUTILS_INCLUDE_DIR_HINTS ${CMAKE_CURRENT_SOURCE_DIR}/dependencies/osi_clp/CoinUtils/src/)
   set(OpenMVG_USE_INTERNAL_COINUTILS ON)
@@ -302,13 +316,16 @@ if (NOT DEFINED COINUTILS_INCLUDE_DIR_HINTS)
 else()
   find_package(CoinUtils QUIET)
 endif()
+endif()
 
+find_package(CoinUtils REQUIRED)
 ## ==============================================================================
 ## Clp
 ## ==============================================================================
 ## - internal by default (Clp),
 ## - external if CLP_INCLUDE_DIR_HINTS and a valid Clp setup is found
 ## ==============================================================================
+if(0)
 if (NOT DEFINED CLP_INCLUDE_DIR_HINTS)
   set(CLP_INCLUDE_DIR_HINTS ${CMAKE_CURRENT_SOURCE_DIR}/dependencies/osi_clp/Clp/src/)
   set(OpenMVG_USE_INTERNAL_CLP ON)
@@ -320,6 +337,9 @@ if (NOT DEFINED CLP_INCLUDE_DIR_HINTS)
 else()
   find_package(Clp QUIET)
 endif()
+endif()
+
+find_package(Clp REQUIRED)
 
 # ==============================================================================
 # Osi
@@ -327,6 +347,7 @@ endif()
 # - internal by default (Osi),
 # - external if OSI_INCLUDE_DIR_HINTS and a valid Osi setup is found
 # ==============================================================================
+if(0)
 if (NOT DEFINED OSI_INCLUDE_DIR_HINTS)
   set(OSI_INCLUDE_DIR_HINTS ${CMAKE_CURRENT_SOURCE_DIR}/dependencies/osi_clp/Osi/src/)
   set(OpenMVG_USE_INTERNAL_OSI ON)
@@ -336,6 +357,9 @@ if (NOT DEFINED OSI_INCLUDE_DIR_HINTS)
 else()
   find_package(Osi QUIET)
 endif()
+endif()
+
+find_package(Osi REQUIRED)
 
 # ==============================================================================
 # Internal CLP/OSI/COINUTILS libraries:
@@ -354,6 +378,7 @@ endif()
 # - internal by default (Lemon),
 # - external if LEMON_INCLUDE_DIR_HINTS and a valid Lemon setup is found
 # ==============================================================================
+if(0)
 if (NOT DEFINED LEMON_INCLUDE_DIR_HINTS)
   set(LEMON_INCLUDE_DIR_HINTS ${CMAKE_CURRENT_SOURCE_DIR}/third_party/lemon)
   set(OpenMVG_USE_INTERNAL_LEMON ON)
@@ -365,6 +390,9 @@ if (NOT LEMON_FOUND OR OpenMVG_USE_INTERNAL_LEMON)
     ${PROJECT_BINARY_DIR}/third_party/lemon)
   set(LEMON_LIBRARY openMVG_lemon)
 endif()
+endif()
+
+find_package(LEMON REQUIRED)
 
 # ==============================================================================
 # OpenCV
@@ -372,20 +400,13 @@ endif()
 # - only external and enabled only if OpenMVG_USE_OPENCV is set to ON
 # ==============================================================================
 if (OpenMVG_USE_OPENCV)
-  find_package( OpenCV QUIET )
-  if (NOT OpenCV_FOUND OR OpenCV_VERSION VERSION_LESS "3.0.0")
-    message(STATUS "OpenCV was not found (note that OpenCV version >= 3.0.0 is required). -> Disabling OpenCV support.")
-    UPDATE_CACHE_VARIABLE(OpenMVG_USE_OPENCV OFF)
-    UPDATE_CACHE_VARIABLE(OpenMVG_USE_OCVSIFT OFF)
-  endif()
+  find_package( OpenCV REQUIRED )
 endif()
 
-
 # ==============================================================================
 # Third-party libraries:
 # ==============================================================================
 add_subdirectory(third_party)
-add_subdirectory(testing)
 
 # ==============================================================================
 # openMVG modules
@@ -472,67 +493,67 @@ message("** Use OpenCV SIFT features: " ${OpenMVG_USE_OCVSIFT})
 
 message("\n")
 
-if (DEFINED OpenMVG_USE_INTERNAL_CEREAL)
+if (OpenMVG_USE_INTERNAL_CEREAL)
   message(STATUS "CEREAL: (internal)")
 else()
   message(STATUS "CEREAL: (external)")
 endif()
 
-if (DEFINED OpenMVG_USE_INTERNAL_EIGEN)
+if (OpenMVG_USE_INTERNAL_EIGEN)
   message(STATUS "EIGEN: " ${EIGEN_VERSION} " (internal)")
 else()
   message(STATUS "EIGEN: " ${EIGEN_VERSION} " (external)")
 endif()
 
-if (DEFINED OpenMVG_USE_INTERNAL_CERES)
+if (OpenMVG_USE_INTERNAL_CERES)
   message(STATUS "CERES: " ${CERES_VERSION} " (internal)")
 else()
   message(STATUS "CERES: " ${CERES_VERSION} " (external)")
 endif()
 
-if (DEFINED OpenMVG_USE_INTERNAL_FLANN)
+if (OpenMVG_USE_INTERNAL_FLANN)
   message(STATUS "FLANN: " ${FLANN_VERSION} " (internal)")
 else()
   message(STATUS "FLANN: " ${FLANN_VERSION} " (external)")
 endif()
 
-if (DEFINED OpenMVG_USE_INTERNAL_TIFF)
+if (OpenMVG_USE_INTERNAL_TIFF)
   message(STATUS "LIBTIFF: " ${TIFF_VERSION_STRING} " (internal)")
 else()
   message(STATUS "LIBTIFF: " ${TIFF_VERSION_STRING} " (external)")
 endif()
 
-if (DEFINED OpenMVG_USE_INTERNAL_PNG)
+if (OpenMVG_USE_INTERNAL_PNG)
   message(STATUS "LIBPNG: " ${PNG_VERSION_STRING} " (internal)")
 else()
   message(STATUS "LIBPNG: " ${PNG_VERSION_STRING} " (external)")
 endif()
 
-if (DEFINED OpenMVG_USE_INTERNAL_JPEG)
+if (OpenMVG_USE_INTERNAL_JPEG)
   message(STATUS "LIBJPEG (internal)")
 else()
   message(STATUS "LIBJPEG (external)")
 endif()
 
-if (DEFINED OpenMVG_USE_INTERNAL_CLP)
+if (OpenMVG_USE_INTERNAL_CLP)
   message(STATUS "CLP: " ${CLP_VERSION} " (internal)")
 else()
   message(STATUS "CLP: " ${CLP_VERSION} " (external)")
 endif()
 
-if (DEFINED OpenMVG_USE_INTERNAL_COINUTILS)
+if (OpenMVG_USE_INTERNAL_COINUTILS)
   message(STATUS "COINUTILS: " ${COINUTILS_VERSION} " (internal)")
 else()
   message(STATUS "COINUTILS: " ${COINUTILS_VERSION} " (external)")
 endif()
 
-if (DEFINED OpenMVG_USE_INTERNAL_OSI)
+if (OpenMVG_USE_INTERNAL_OSI)
   message(STATUS "OSI: " ${OSI_VERSION} " (internal)")
 else()
   message(STATUS "OSI: " ${OSI_VERSION} " (external)")
 endif()
 
-if (DEFINED OpenMVG_USE_INTERNAL_LEMON)
+if (OpenMVG_USE_INTERNAL_LEMON)
   message(STATUS "LEMON: " ${LEMON_VERSION} " (internal)")
 else()
   message(STATUS "LEMON: " ${LEMON_VERSION} " (external)")
diff --git a/src/cmakeFindModules/FindClp.cmake b/src/cmakeFindModules/FindClp.cmake
index 8a69c23..6a81580 100644
--- a/src/cmakeFindModules/FindClp.cmake
+++ b/src/cmakeFindModules/FindClp.cmake
@@ -51,9 +51,8 @@ IF(EXISTS "${CLP_DIR}" AND NOT "${CLP_DIR}" STREQUAL "")
         SET(CLP_INCLUDE_DIR ${CLP_DIR})
 
         FIND_LIBRARY(CLP_LIBRARY NAMES Clp)
-        FIND_LIBRARY(CLPSOLVER_LIBRARY NAMES ClpSolver)
-        FIND_LIBRARY(OSICLP_LIBRARY NAMES OsiClp)
-
+        FIND_LIBRARY(CLPSOLVER_LIBRARY NAMES ClpSolver Clp)
+        FIND_LIBRARY(OSICLP_LIBRARY NAMES OsiClp Clp)
         # locate Clp libraries
         IF(DEFINED CLP_LIBRARY AND DEFINED CLPSOLVER_LIBRARY AND DEFINED OSICLP_LIBRARY)
           SET(CLP_LIBRARIES ${CLP_LIBRARY} ${CLPSOLVER_LIBRARY} ${OSICLP_LIBRARY})
diff --git a/src/cmakeFindModules/OpenMVGConfig.cmake.in b/src/cmakeFindModules/OpenMVGConfig.cmake.in
index e7dfbfd..c01910d 100644
--- a/src/cmakeFindModules/OpenMVGConfig.cmake.in
+++ b/src/cmakeFindModules/OpenMVGConfig.cmake.in
@@ -19,7 +19,7 @@
 # OPENMVG_VERSION: Version of OpenMVG found.
 #
 
-# Called if we failed to find OpenMVG or any of it's required dependencies,
+# Called if we failed to find OpenMVG or any of its required dependencies,
 # unsets all public (designed to be used externally) variables and reports
 # error message at priority depending upon [REQUIRED/QUIET/<NONE>] argument.
 macro(OPENMVG_REPORT_NOT_FOUND REASON_MSG)
@@ -59,9 +59,19 @@ set(CALLERS_CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH})
 # script.
 set(CMAKE_MODULE_PATH ${CURRENT_CONFIG_INSTALL_DIR})
 
+include(CMakeFindDependencyMacro)
+find_dependency(CoinUtils)
+find_dependency(Clp)
+find_dependency(Osi)
+find_dependency(flann)
+find_dependency(Threads)
+find_dependency(cereal)
+find_dependency(Ceres)
+find_dependency(vlfeat)
+
 # Build the absolute root install directory as a relative path
 get_filename_component(CURRENT_ROOT_INSTALL_DIR
-  ${CMAKE_MODULE_PATH}/../../../ ABSOLUTE)
+  ${CMAKE_MODULE_PATH}/../../ ABSOLUTE)
 if (NOT EXISTS ${CURRENT_ROOT_INSTALL_DIR})
   OPENMVG_REPORT_NOT_FOUND(
     "OpenMVG install root: ${CURRENT_ROOT_INSTALL_DIR}, "
diff --git a/src/nonFree/sift/CMakeLists.txt b/src/nonFree/sift/CMakeLists.txt
index 402a2d8..60ddc11 100644
--- a/src/nonFree/sift/CMakeLists.txt
+++ b/src/nonFree/sift/CMakeLists.txt
@@ -1,36 +1,36 @@
 
-# libs should be static
-set(BUILD_SHARED_LIBS OFF)
-
-# use PIC code for link into shared lib
-if(UNIX)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
-endif(UNIX)
-
-if(NOT USE_SSE2)
-  add_definitions(-DVL_DISABLE_SSE2)
-endif()
-
-add_definitions(-DVL_DISABLE_THREADS)
-
-include_directories(./vl)
-set(FEATS
-  vl/generic.c
-  vl/imopv_sse2.c
-  vl/sift.c
-  vl/imopv.c
-  vl/mathop_sse2.c
-  vl/sift.c
-  vl/host.c
-  vl/mathop.c
-  vl/random.c)
-set_source_files_properties(${FEATS} PROPERTIES LANGUAGE C)
-add_library(vlsift ${FEATS})
-install(TARGETS vlsift DESTINATION lib EXPORT openMVG-targets)
-set_property(TARGET vlsift PROPERTY FOLDER OpenMVG/nonFree)
+## libs should be static
+#set(BUILD_SHARED_LIBS OFF)
+#
+## use PIC code for link into shared lib
+#if(UNIX)
+#  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
+#endif(UNIX)
+#
+#if(NOT USE_SSE2)
+#  add_definitions(-DVL_DISABLE_SSE2)
+#endif()
+#
+#add_definitions(-DVL_DISABLE_THREADS)
+#
+#include_directories(./vl)
+#set(FEATS
+#  vl/generic.c
+#  vl/imopv_sse2.c
+#  vl/sift.c
+#  vl/imopv.c
+#  vl/mathop_sse2.c
+#  vl/sift.c
+#  vl/host.c
+#  vl/mathop.c
+#  vl/random.c)
+#set_source_files_properties(${FEATS} PROPERTIES LANGUAGE C)
+#add_library(vlsift ${FEATS})
+#install(TARGETS vlsift DESTINATION lib EXPORT openMVG-targets)
+#set_property(TARGET vlsift PROPERTY FOLDER OpenMVG/nonFree)
 install(
   DIRECTORY .
   DESTINATION include/openMVG_dependencies/nonFree/sift
   COMPONENT headers
-  FILES_MATCHING PATTERN "*.hpp" PATTERN "*.h"
+  FILES_MATCHING PATTERN "*.hpp"
 )
diff --git a/src/nonFree/sift/SIFT_describer.hpp b/src/nonFree/sift/SIFT_describer.hpp
index cd800b0..20e9c8e 100644
--- a/src/nonFree/sift/SIFT_describer.hpp
+++ b/src/nonFree/sift/SIFT_describer.hpp
@@ -17,9 +17,7 @@
 #include <iostream>
 #include <numeric>
 
-extern "C" {
-#include "nonFree/sift/vl/sift.h"
-}
+#include <sift.h>
 
 namespace openMVG {
 namespace features {
@@ -174,7 +172,7 @@ public:
       const int nkeys = vl_sift_get_nkeypoints(filt);
 
       // Update gradient before launching parallel extraction
-      vl_sift_update_gradient(filt);
+      update_gradient(filt);
 
       #ifdef OPENMVG_USE_OPENMP
       #pragma omp parallel for private(descr, descriptor)
diff --git a/src/openMVG/linearProgramming/CMakeLists.txt b/src/openMVG/linearProgramming/CMakeLists.txt
index cc5212f..acc57dd 100644
--- a/src/openMVG/linearProgramming/CMakeLists.txt
+++ b/src/openMVG/linearProgramming/CMakeLists.txt
@@ -15,16 +15,12 @@ target_link_libraries(openMVG_linearProgramming
   PUBLIC
     openMVG_numeric
   PRIVATE
-    ${CLP_LIBRARIES}     # clp + solver wrapper
-    ${COINUTILS_LIBRARY} # container tools
-    ${OSI_LIBRARY}       # generic LP
+    Coin::Clp       # clp + solver wrapper
+    Coin::CoinUtils # container tools
+    Coin::Osi       # generic LP
 )
 
 target_include_directories(openMVG_linearProgramming
-  PRIVATE
-    ${CLP_INCLUDE_DIRS}
-    ${COINUTILS_INCLUDE_DIRS}
-    ${OSI_INCLUDE_DIRS}
   PUBLIC
     $<INSTALL_INTERFACE:include>
 )
diff --git a/src/openMVG/matching/CMakeLists.txt b/src/openMVG/matching/CMakeLists.txt
index 5fcd972..b21ea7b 100644
--- a/src/openMVG/matching/CMakeLists.txt
+++ b/src/openMVG/matching/CMakeLists.txt
@@ -18,6 +18,7 @@ list(REMOVE_ITEM matching_files_cpp ${REMOVEFILESUNITTEST})
 
 set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
+find_package(flann CONFIG REQUIRED)
 
 set_source_files_properties(${matching_files_cpp} PROPERTIES LANGUAGE CXX)
 add_library(openMVG_matching
@@ -39,10 +40,10 @@ target_link_libraries(openMVG_matching
     Threads::Threads
     cereal
 )
-if (NOT DEFINED OpenMVG_USE_INTERNAL_FLANN)
+if (NOT OpenMVG_USE_INTERNAL_FLANN)
 target_link_libraries(openMVG_matching
   PUBLIC
-    ${FLANN_LIBRARIES}
+    $<IF:$<TARGET_EXISTS:flann::flann_s>,flann::flann_s,flann::flann>
 )
 endif()
 set_target_properties(openMVG_matching PROPERTIES SOVERSION ${OPENMVG_VERSION_MAJOR} VERSION "${OPENMVG_VERSION_MAJOR}.${OPENMVG_VERSION_MINOR}")
diff --git a/src/openMVG/numeric/CMakeLists.txt b/src/openMVG/numeric/CMakeLists.txt
index 1f3fc30..4097320 100644
--- a/src/openMVG/numeric/CMakeLists.txt
+++ b/src/openMVG/numeric/CMakeLists.txt
@@ -26,7 +26,7 @@ target_include_directories(openMVG_numeric
     $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}>
     $<INSTALL_INTERFACE:include>
 )
-if (DEFINED OpenMVG_USE_INTERNAL_EIGEN)
+if (OpenMVG_USE_INTERNAL_EIGEN)
   target_include_directories(openMVG_numeric PUBLIC
     $<INSTALL_INTERFACE:${CMAKE_INSTALL_PREFIX}/include/openMVG/third_party/eigen/>)
 else()
diff --git a/src/openMVG_Samples/describe_and_match_GUI/CMakeLists.txt b/src/openMVG_Samples/describe_and_match_GUI/CMakeLists.txt
index 862ffc7..326fc9a 100644
--- a/src/openMVG_Samples/describe_and_match_GUI/CMakeLists.txt
+++ b/src/openMVG_Samples/describe_and_match_GUI/CMakeLists.txt
@@ -18,7 +18,7 @@ if (OpenMVG_BUILD_GUI_SOFTWARES)
       add_executable( openMVG_sample_describe_and_match_GUI WIN32 ${FEATURES_PAIR_DEMO_SRCS} ${FEATURES_PAIR_DEMO_HDRS} )
     endif( APPLE )
 
-    target_link_libraries( openMVG_sample_describe_and_match_GUI Qt5::Widgets openMVG_features openMVG_image openMVG_matching vlsift )
+    target_link_libraries( openMVG_sample_describe_and_match_GUI Qt5::Widgets openMVG_features openMVG_image openMVG_matching unofficial::vlfeat::vl )
 
     set_target_properties( openMVG_sample_describe_and_match_GUI PROPERTIES CXX_STANDARD 11)
 
diff --git a/src/openMVG_Samples/features_image_matching/CMakeLists.txt b/src/openMVG_Samples/features_image_matching/CMakeLists.txt
index 18fb385..d44ffce 100644
--- a/src/openMVG_Samples/features_image_matching/CMakeLists.txt
+++ b/src/openMVG_Samples/features_image_matching/CMakeLists.txt
@@ -5,7 +5,7 @@ target_link_libraries(openMVG_sample_image_matching
   openMVG_features
   openMVG_matching
   ${STLPLUS_LIBRARY}
-  vlsift)
+  unofficial::vlfeat::vl)
 target_compile_definitions(openMVG_sample_image_matching
   PRIVATE -DTHIS_SOURCE_DIR="${CMAKE_CURRENT_SOURCE_DIR}")
 
diff --git a/src/openMVG_Samples/features_repeatability/CMakeLists.txt b/src/openMVG_Samples/features_repeatability/CMakeLists.txt
index fd2b7c6..91f2766 100644
--- a/src/openMVG_Samples/features_repeatability/CMakeLists.txt
+++ b/src/openMVG_Samples/features_repeatability/CMakeLists.txt
@@ -6,7 +6,7 @@ target_link_libraries(openMVG_sample_main_features_repeatability_dataset
   openMVG_matching
   openMVG_system
   openMVG_multiview
-  vlsift
+  unofficial::vlfeat::vl
   ${STLPLUS_LIBRARY})
 
 set_property(TARGET openMVG_sample_main_features_repeatability_dataset PROPERTY FOLDER OpenMVG/Samples)
diff --git a/src/software/Localization/CMakeLists.txt b/src/software/Localization/CMakeLists.txt
index 2f60393..0d57d0a 100644
--- a/src/software/Localization/CMakeLists.txt
+++ b/src/software/Localization/CMakeLists.txt
@@ -11,7 +11,7 @@ target_link_libraries(openMVG_main_SfM_Localization
   openMVG_sfm
   openMVG_exif
   ${STLPLUS_LIBRARY}
-  vlsift
+  unofficial::vlfeat::vl
   )
 
 # Installation rules
diff --git a/src/software/SfM/CMakeLists.txt b/src/software/SfM/CMakeLists.txt
index 013a6c8..f38daa9 100644
--- a/src/software/SfM/CMakeLists.txt
+++ b/src/software/SfM/CMakeLists.txt
@@ -44,7 +44,7 @@ target_link_libraries(openMVG_main_ComputeFeatures
     openMVG_multiview
     openMVG_sfm
     ${STLPLUS_LIBRARY}
-    vlsift
+    unofficial::vlfeat::vl
 )
 if (MSVC)
   set_target_properties(openMVG_main_ComputeFeatures PROPERTIES COMPILE_FLAGS "/bigobj")
@@ -235,7 +235,7 @@ if(OpenMVG_USE_OPENCV)
     openMVG_multiview
     openMVG_sfm
     ${STLPLUS_LIBRARY}
-    vlsift
+    unofficial::vlfeat::vl
     ${OpenCV_LIBS})
   target_include_directories(openMVG_main_ComputeFeatures_OpenCV PRIVATE ${OpenCV_INCLUDE_DIRS})
 
diff --git a/src/software/SfM/SfM_GlobalPipeline.py.in b/src/software/SfM/SfM_GlobalPipeline.py.in
index 42405a4..28b0246 100644
--- a/src/software/SfM/SfM_GlobalPipeline.py.in
+++ b/src/software/SfM/SfM_GlobalPipeline.py.in
@@ -21,7 +21,7 @@
 OPENMVG_SFM_BIN = "@OPENMVG_SOFTWARE_SFM_BUILD_DIR@"
 
 # Indicate the openMVG camera sensor width directory
-CAMERA_SENSOR_WIDTH_DIRECTORY = "@OPENMVG_SOFTWARE_SFM_SRC_DIR@" + "/../../openMVG/exif/sensor_width_database"
+CAMERA_SENSOR_WIDTH_DIRECTORY = "@OPENMVG_CAMERA_SENSOR_WIDTH_DIRECTORY@"
 
 import os
 import subprocess
@@ -77,5 +77,3 @@ pRecons.wait()
 
 pRecons = subprocess.Popen( [os.path.join(OPENMVG_SFM_BIN, "openMVG_main_ComputeSfM_DataColor"),  "-i", reconstruction_dir+"/robust.bin", "-o", os.path.join(reconstruction_dir,"robust_colorized.ply")] )
 pRecons.wait()
-
-
diff --git a/src/software/SfM/SfM_SequentialPipeline.py.in b/src/software/SfM/SfM_SequentialPipeline.py.in
index 9a5a482..e804a19 100644
--- a/src/software/SfM/SfM_SequentialPipeline.py.in
+++ b/src/software/SfM/SfM_SequentialPipeline.py.in
@@ -21,7 +21,7 @@
 OPENMVG_SFM_BIN = "@OPENMVG_SOFTWARE_SFM_BUILD_DIR@"
 
 # Indicate the openMVG camera sensor width directory
-CAMERA_SENSOR_WIDTH_DIRECTORY = "@OPENMVG_SOFTWARE_SFM_SRC_DIR@" + "/../../openMVG/exif/sensor_width_database"
+CAMERA_SENSOR_WIDTH_DIRECTORY = "@OPENMVG_CAMERA_SENSOR_WIDTH_DIRECTORY@"
 
 import os
 import subprocess
@@ -77,5 +77,3 @@ pRecons.wait()
 
 pRecons = subprocess.Popen( [os.path.join(OPENMVG_SFM_BIN, "openMVG_main_ComputeSfM_DataColor"),  "-i", reconstruction_dir+"/robust.bin", "-o", os.path.join(reconstruction_dir,"robust_colorized.ply")] )
 pRecons.wait()
-
-
diff --git a/src/software/SfM/main_ComputeFeatures_OpenCV.cpp b/src/software/SfM/main_ComputeFeatures_OpenCV.cpp
index 9cc46af..f8bd892 100644
--- a/src/software/SfM/main_ComputeFeatures_OpenCV.cpp
+++ b/src/software/SfM/main_ComputeFeatures_OpenCV.cpp
@@ -208,7 +208,7 @@ public:
     // Create a SIFT detector
     std::vector< cv::KeyPoint > v_keypoints;
     cv::Mat m_desc;
-    cv::Ptr<cv::Feature2D> siftdetector = cv::xfeatures2d::SIFT::create();
+    cv::Ptr<cv::Feature2D> siftdetector = cv::SIFT::create();
 
     // Process SIFT computation
     siftdetector->detectAndCompute(img, m_mask, v_keypoints, m_desc);
diff --git a/src/software/SfM/tutorial_demo.py.in b/src/software/SfM/tutorial_demo.py.in
index 259e24e..1097062 100644
--- a/src/software/SfM/tutorial_demo.py.in
+++ b/src/software/SfM/tutorial_demo.py.in
@@ -12,7 +12,7 @@
 OPENMVG_SFM_BIN = "@OPENMVG_SOFTWARE_SFM_BUILD_DIR@"
 
 # Indicate the openMVG camera sensor width directory
-CAMERA_SENSOR_WIDTH_DIRECTORY = "@OPENMVG_SOFTWARE_SFM_SRC_DIR@" + "/../../openMVG/exif/sensor_width_database"
+CAMERA_SENSOR_WIDTH_DIRECTORY = "@OPENMVG_CAMERA_SENSOR_WIDTH_DIRECTORY@"
 
 import os
 import subprocess
@@ -89,5 +89,3 @@ pRecons.wait()
 print ("4. Structure from Known Poses (robust triangulation)")
 pRecons = subprocess.Popen( [os.path.join(OPENMVG_SFM_BIN, "openMVG_main_ComputeStructureFromKnownPoses"),  "-i", reconstruction_dir+"/sfm_data.bin", "-m", matches_dir, "-o", os.path.join(reconstruction_dir,"robust.ply")] )
 pRecons.wait()
-
-
diff --git a/src/software/VO/Tracker_opencv_klt.hpp b/src/software/VO/Tracker_opencv_klt.hpp
index aa7dffe..2c4d237 100644
--- a/src/software/VO/Tracker_opencv_klt.hpp
+++ b/src/software/VO/Tracker_opencv_klt.hpp
@@ -80,7 +80,7 @@ struct Tracker_opencv_KLT : public Abstract_Tracker
     std::vector<cv::KeyPoint> m_nextKeypoints;
 
     cv::Ptr<cv::FeatureDetector> m_detector = cv::GFTTDetector::create(count);
-    if (m_detector == NULL)
+    if (m_detector == nullptr)
       return false;
 
     m_detector->detect(current_img, m_nextKeypoints);
diff --git a/src/third_party/CMakeLists.txt b/src/third_party/CMakeLists.txt
index b71dfab..ad98e51 100644
--- a/src/third_party/CMakeLists.txt
+++ b/src/third_party/CMakeLists.txt
@@ -18,7 +18,7 @@ add_subdirectory(stlplus3)
 set(STLPLUS_LIBRARY openMVG_stlplus PARENT_SCOPE)
 
 # Add graph library
-if(DEFINED OpenMVG_USE_INTERNAL_LEMON)
+if(OpenMVG_USE_INTERNAL_LEMON)
   add_subdirectory(lemon)
   set_property(TARGET openMVG_lemon PROPERTY FOLDER OpenMVG/3rdParty/lemon)
   set_property(TARGET check PROPERTY FOLDER OpenMVG/3rdParty/lemon)
@@ -68,7 +68,7 @@ endif (NOT TIFF_FOUND)
 add_subdirectory(vectorGraphics)
 
 # Add ceres-solver (A Nonlinear Least Squares Minimizer)
-if (DEFINED OpenMVG_USE_INTERNAL_CERES)
+if (OpenMVG_USE_INTERNAL_CERES)
   add_subdirectory(cxsparse)
   add_subdirectory(ceres-solver)
   set_property(TARGET openMVG_cxsparse PROPERTY FOLDER OpenMVG/3rdParty/ceres)
@@ -76,7 +76,7 @@ if (DEFINED OpenMVG_USE_INTERNAL_CERES)
 endif()
 
 # Add an Approximate Nearest Neighbor library
-if (DEFINED OpenMVG_USE_INTERNAL_FLANN)
+if (OpenMVG_USE_INTERNAL_FLANN)
   set(FLANN_INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_PREFIX}/include/openMVG/third_party/flann/src/cpp)
   add_subdirectory(flann)
 endif()
@@ -90,7 +90,7 @@ add_subdirectory(fast)
 ##
 # Install Header only libraries if necessary
 ##
-if (DEFINED OpenMVG_USE_INTERNAL_EIGEN)
+if (OpenMVG_USE_INTERNAL_EIGEN)
   #Configure Eigen install
   set(EIGEN_INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_PREFIX}/include/openMVG/third_party/eigen)
   add_subdirectory(eigen)