parallel 3.1.3 does not install on octave 5.1.0 on osx 10.14.6 in brew

[sshah]

I am running octave 5.1.0_6 on Mac OS 10.14.6 (Mojave). I use updated
homebrew.  It fails to install parallel from forge.  

Struct 1.0.16 has been installed and runs fine. 

octave:3> pkg install -forge parallel

(warnings no copied)

pserver.cc:172:13: error: use of undeclared identifier 'command_editor'; did
you mean 'octave::command_editor'?
            command_editor::increment_current_command_number ();
            ^~~~~~~~~~~~~~
            octave::command_editor
/usr/local/Cellar/octave/5.1.0_6/include/octave-5.1.0/octave/../octave/cmd-edit.h:39:3:
note: 
      'octave::command_editor' declared here
  command_editor
  ^
pconnect.cc:536:35: error: use of undeclared identifier 'octave_env'
          std::string directory = octave_env::get_current_directory ();
                                  ^
pserver.cc:1119:23: error: use of undeclared identifier 'octave_env'
          int cd_ok = octave_env::chdir (directory.c_str ());
                      ^
pserver.cc:1122:13: error: use of undeclared identifier 'octave_env'
            octave_env::chdir ("/tmp");
            ^
1 error generated.
1 warning and 3 errors generated.
make: *** [pconnect.o] Error 1
make: *** Waiting for unfinished jobs....
make: *** [pserver.o] Error 1

pkg: error running `make' for the parallel package.
error: called from
    configure_make at line 99 column 9
    install at line 184 column 7

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A few other data points.  Rebuilding octave 5.1.0_6 from source using brew
does not help. 

On Mac OS 10.13 (High Sierra)  parallel package works fine in octave 5.1.0_6
(Homebrew).

Downloading mercurial development version from sourceforge.net and building
a tarball also fails: 

make check
...
   

clang++ -std=gnu++11 -pthread -Wall -o octave-pserver octave-pserver.cc
octave-pserver.cc:25:10: fatal error: 'error.h' file not found
#include <error.h>

Replacing the offending line 25 with 

#include <mach/error.h>  

did not work either.  Same error message as before. 


Thanks for any help in advance.










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