vcpkg/ports/dlib/fix-dependencies.patch

diff --git a/dlib/CMakeLists.txt b/dlib/CMakeLists.txt
index cfe6ad9..75cfd54 100644
--- a/dlib/CMakeLists.txt
+++ b/dlib/CMakeLists.txt
@@ -293,6 +293,7 @@ if (NOT TARGET dlib)
    set(dlib_needed_public_ldflags)
    set(dlib_needed_private_libraries)
    set(dlib_needed_private_includes)
+   set(pkg_config_dlib_requires_private "")
 
    if (DLIB_ISO_CPP_ONLY)
       add_library(dlib ${source_files} )
@@ -833,6 +834,10 @@ if (NOT TARGET dlib)
 
 
       if (DLIB_LINK_WITH_SQLITE3)
+         find_package(unofficial-sqlite3 CONFIG REQUIRED)
+         list(APPEND dlib_needed_libraries unofficial::sqlite3::sqlite3)
+         string(APPEND pkg_config_dlib_requires_private " sqlite3")
+      elseif(0)
          find_library(sqlite sqlite3)
          # make sure sqlite3.h is in the include path
          find_path(sqlite_path sqlite3.h)
@@ -848,6 +853,10 @@ if (NOT TARGET dlib)
 
 
       if (DLIB_USE_FFTW)
+         find_package(FFTW3 CONFIG REQUIRED)
+         list(APPEND dlib_needed_libraries FFTW3::fftw3)
+         string(APPEND pkg_config_dlib_requires_private " fftw3")
+      elseif(0)
          find_library(fftw fftw3)
          # make sure fftw3.h is in the include path
          find_path(fftw_path fftw3.h)
@@ -998,6 +1007,8 @@ if (NOT TARGET dlib)
 
       ## dlib-1.pc generation and installation
 
+      string (REGEX REPLACE " m " " -lm " pkg_config_dlib_needed_libraries "${pkg_config_dlib_needed_libraries} ")
+      string (REGEX REPLACE "[^ ]*::[^ ]*" "" pkg_config_dlib_needed_libraries "${pkg_config_dlib_needed_libraries}")
       configure_file("cmake_utils/dlib.pc.in" "dlib-1.pc" @ONLY)
       install(FILES "${CMAKE_CURRENT_BINARY_DIR}/dlib-1.pc"
          DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
@@ -1011,7 +1022,7 @@ if (NOT TARGET dlib)
 
 endif()
 
-if (MSVC)
+if (0)
    # Give the output library files names that are unique functions of the
    # visual studio mode that compiled them.  We do this so that people who
    # compile dlib and then copy the .lib files around (which they shouldn't be
diff --git a/dlib/cmake_utils/dlib.pc.in b/dlib/cmake_utils/dlib.pc.in
index 9060110..2ec27e8 100644
--- a/dlib/cmake_utils/dlib.pc.in
+++ b/dlib/cmake_utils/dlib.pc.in
@@ -6,3 +6,4 @@ Description: Numerical and networking C++ library
 Version: @VERSION@
 Libs: -L${libdir} -ldlib @pkg_config_dlib_needed_libraries@
 Cflags: -I${includedir} @pkg_config_dlib_needed_includes@
+Requires.private: @pkg_config_dlib_requires_private@
diff --git a/dlib/cmake_utils/dlibConfig.cmake.in b/dlib/cmake_utils/dlibConfig.cmake.in
index 2667a2e..cc7b4a2 100644
--- a/dlib/cmake_utils/dlibConfig.cmake.in
+++ b/dlib/cmake_utils/dlibConfig.cmake.in
@@ -31,6 +31,14 @@ if(NOT TARGET dlib-shared AND NOT dlib_BINARY_DIR)
    unset(dlib_deps_threads_check)
 endif()
 
+include(CMakeFindDependencyMacro)
+if("@DLIB_USE_FFTW@")
+   find_dependency(FFTW3 CONFIG)
+endif()
+if("@DLIB_LINK_WITH_SQLITE3@")
+   find_dependency(unofficial-sqlite3 CONFIG)
+endif()
+
 set(dlib_LIBRARIES dlib::dlib)
 set(dlib_LIBS      dlib::dlib)
 set(dlib_INCLUDE_DIRS "@CMAKE_INSTALL_FULL_INCLUDEDIR@" "@dlib_needed_includes@")