build fails on (my) macos

[Jean-Christophe Helary]

I usually do a checkout/build relatively frequently but this time I had not 
tried for a few months. Here is the errors I get (macos 10.14.3)

  CC       save-cwd.o
  AR       libgnu.a
/Applications/Xcode.app/Contents/Developer/usr/bin/make -C lib-src all
  CCLD     etags
ld: warning: ignoring file ../lib/libgnu.a, file was built for archive which is 
not the architecture being linked (x86_64): ../lib/libgnu.a
Undefined symbols for architecture x86_64:
  "_c_isalnum", referenced from:
      _Asm_labels in etags-07d675.o
      _Cobol_paragraphs in etags-07d675.o
      _Erlang_functions in etags-07d675.o
      _Perl_functions in etags-07d675.o
      _Prolog_functions in etags-07d675.o
      _Ruby_functions in etags-07d675.o
      _Ada_getit in etags-07d675.o
      ...
  "_c_strcasecmp", referenced from:
      _get_language_from_filename in etags-07d675.o
  "_c_strncasecmp", referenced from:
      _Forth_words in etags-07d675.o
      _Fortran_functions in etags-07d675.o
      _HTML_labels in etags-07d675.o
  "_rpl_getopt_long", referenced from:
      _main in etags-07d675.o
  "_rpl_optarg", referenced from:
      _main in etags-07d675.o
  "_rpl_optind", referenced from:
      _main in etags-07d675.o
  "_rpl_re_compile_pattern", referenced from:
      _add_regex in etags-07d675.o
  "_rpl_re_match", referenced from:
      _readline in etags-07d675.o
  "_rpl_re_search", referenced from:
      _find_entries in etags-07d675.o
  "_rpl_re_set_syntax", referenced from:
      _add_regex in etags-07d675.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [etags] Error 1
make: *** [lib-src] Error 2

Any idea how to fix that ?

Jean-Christophe Helary
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http://mac4translators.blogspot.com @brandelune