common.cc:98:18: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘octave_idx_type’ {aka ‘long int’} [-Wformat=]
         warning ("%s: unknown warning, iwarn = %d", name, index);
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~        ~~~~~
warning: LFLAGS is deprecated and will be removed in a future version of Octave, use LDFLAGS instead
/tmp/octave-help-Ahi1dx:159: misplaced {
/tmp/octave-help-Ahi1dx:159: misplaced }
/tmp/octave-help-PM5udt:156: misplaced {
/tmp/octave-help-PM5udt:156: misplaced }
/home/doug/octave/control-3.1.0/x86_64-pc-linux-gnu-api-v52+/__control_slicot_functions__.oct: failed to load: /home/doug/octave/control-3.1.0/x86_64-pc-linux-gnu-api-v52+/__control_slicot_functions__.oct: undefined symbol: _Z11warning_msgPKcllPS0_l
error: called from
    doc_cache_create>create_cache at line 109 column 20
    gen_doc_cache_in_dir>@<anonymous> at line 143 column 16
    doc_cache_create>gen_doc_cache_in_dir at line 144 column 9
    doc_cache_create at line 55 column 12
    install>generate_lookfor_cache at line 794 column 5
    install at line 223 column 7
    pkg at line 441 column 9