Function eval_state_builder_load 

pub unsafe extern "C" fn eval_state_builder_load(
    context: *mut c_context,
    builder: *mut eval_state_builder,
) -> err

@brief Read settings from the ambient environment @ingroup libexpr_init

Settings are sourced from environment variables and configuration files, as documented in the Nix manual.

@param[out] context Optional, stores error information @param[out] builder The builder to modify. @return NIX_OK if successful, an error code otherwise.