Linux installation: dependency Threads resolving

[atrof]

While configuration, cmake throws an error:
"package "Qt6" is considered to be NOT FOUND. Reason given by package: Qt6 could not be found because dependency Threads could not be found."

Which library should I install to resolve this dependency?

[atrof]

Like this:
set(CMAKE_THREAD_LIBS_INIT "-lpthread")
set(CMAKE_HAVE_THREADS_LIBRARY 1)
set(CMAKE_USE_WIN32_THREADS_INIT 0)
set(CMAKE_USE_PTHREADS_INIT 1)
set(THREADS_PREFER_PTHREAD_FLAG ON)