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   htop    ( 1 )

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EXTERNAL LIBRARIES

While htop depends on most of the libraries it uses at build time
       there are two noteworthy exceptions to this rule. These
       exceptions both relate to data displayed in meters displayed in
       the header of htop and were intentionally created as optional
       runtime dependencies instead.  These exceptions are described
       below:

       libsystemd
              The bindings for libsystemd are used in the SystemD meter
              to determine the number of active services and the overall
              system state. Looking for the functions to determine these
              information at runtime allows for builds to support these
              meters without forcing the package manager to install
              these libraries on systems that otherwise don't use
              systemd.

              Summary: no build time dependency, optional runtime
              dependency on libsystemd via dynamic loading, with
              systemctl(1) fallback.

       libsensors
              The bindings for libsensors are used for the CPU
              temperature readings in the CPU usage meters if displaying
              the temperature is enabled through the setup screen. In
              order for htop to show these temperatures correctly
              though, a proper configuration of libsensors through its
              usual configuration files is assumed and that all CPU
              cores correspond to temperature sensors from the coretemp
              driver with core 0 corresponding to a sensor labelled
              "Core 0". The package temperature may be given as "Package
              id 0". If missing it is inferred as the maximum value from
              the available per-core readings.

              Summary: build time dependency on libsensors(3) C header
              files, optional runtime dependency on libsensors(3) via
              dynamic loading.