[libdatachannel] configure failure

[vipcxj]

Operating system

ubuntu

Compiler

gcc

Steps to reproduce the behavior

cmake --preset default

Failure logs

CMake Error at /home/ps/workspace/projects/vcpkg/scripts/buildsystems/vcpkg.cmake:598 (_add_executable):
Target "demo" links to target "unofficial::usrsctp::usrsctp" but the target
was not found. Perhaps a find_package() call is missing for an IMPORTED
target, or an ALIAS target is missing?
Call Stack (most recent call first):
CMakeLists.txt:8 (add_executable)

Additional context

This is my vcpkg.json

{
  "dependencies": [
    "ffmpeg",
    {
      "name": "libdatachannel",
      "features": [
        "srtp"
      ]
    },
    "poco",
    "socket-io-client"
  ]
}

This is my CMakePresets.json

{
    "version": 3,
    "configurePresets": [
        {
            "name": "default",
            "binaryDir": "${sourceDir}/build",
            "cacheVariables": {
                "CMAKE_TOOLCHAIN_FILE": "$env{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake"
            }
        }
    ]
}

This is my CMakeLists.txt

cmake_minimum_required(VERSION 3.22)

project(cwebrtc-demo)
set(SOURCES
    main.cpp
)

add_executable(demo ${SOURCES})

set_target_properties(demo PROPERTIES
	CXX_STANDARD 17
	OUTPUT_NAME demo)

#find_package(unofficial-usrsctp CONFIG REQUIRED) // without this line, error raised. usrsctp is dependency of libdatachannel, not my project
find_package(sioclient CONFIG REQUIRED)
find_package(Poco REQUIRED COMPONENTS Foundation Net)
find_package(LibDataChannel CONFIG REQUIRED)

target_link_libraries(demo PRIVATE 
	LibDataChannel::LibDataChannelStatic 
	sioclient::sioclient sioclient::sioclient_tls
	Poco::Foundation Poco::Net 
)
find_package(FFMPEG REQUIRED)
target_include_directories(demo PRIVATE ${FFMPEG_INCLUDE_DIRS})
target_link_directories(demo PRIVATE ${FFMPEG_LIBRARY_DIRS})
target_link_libraries(demo PRIVATE ${FFMPEG_LIBRARIES})

If I change

#find_package(unofficial-usrsctp CONFIG REQUIRED)

to

find_package(unofficial-usrsctp CONFIG REQUIRED)

error disappeared. but my project not directly depend on usrsctp
usrsctp is the dependcy of libdatachannel

if I change vcpkg.json from

{
  "dependencies": [
    "ffmpeg",
    {
      "name": "libdatachannel",
      "features": [
        "srtp"
      ]
    },
    "poco",
    "socket-io-client"
  ]
}

to

{
  "dependencies": [
    "ffmpeg",
    "libdatachannel",
    "poco",
    "socket-io-client"
  ]
}

The error changed.

  Could not find a package configuration file provided by "libSRTP" with any
  of the following names:

    libSRTPConfig.cmake
    libsrtp-config.cmake

  Add the installation prefix of "libSRTP" to CMAKE_PREFIX_PATH or set
  "libSRTP_DIR" to a directory containing one of the above files.  If
  "libSRTP" provides a separate development package or SDK, be sure it has
  been installed.

[vipcxj]

I found error appeared on windows, as well.

  Could not find a package configuration file provided by "libSRTP" with any
  of the following names:

    libSRTPConfig.cmake
    libsrtp-config.cmake

  Add the installation prefix of "libSRTP" to CMAKE_PREFIX_PATH or set
  "libSRTP_DIR" to a directory containing one of the above files.  If
  "libSRTP" provides a separate development package or SDK, be sure it has
  been installed.

when using such vcpkg.json

{
  "dependencies": [
    "libdatachannel",
  ]
}

When change to

{
  "dependencies": [
    {
      "name": "libdatachannel",
      "features": [
        "srtp"
      ]
    },
  ]
}

cmake config successfully. No need to add find_package(unofficial-usrsctp CONFIG REQUIRED) on windows.