File ‘gpg/libs/gpg.so’:
  Found ‘___assert_rtn’, possibly from ‘assert’ (C)
    Objects: ‘../.deps/lib/libbrewassuan.a’,
      ‘../.deps/lib/libbrewgpgme.a’,
      ‘../.deps/opt/gpgme/lib/libbrewassuan.a’,
      ‘../.deps/opt/gpgme/lib/libbrewgpgme.a’
  Found ‘___sprintf_chk’, possibly from ‘sprintf’ (C)
    Objects: ‘../.deps/lib/libbrewassuan.a’,
      ‘../.deps/lib/libbrewgpg-error.a’,
      ‘../.deps/opt/gpgme/lib/libbrewassuan.a’,
      ‘../.deps/opt/gpgme/lib/libbrewgpg-error.a’
  Found ‘___stderrp’, possibly from ‘stderr’ (C)
    Objects: ‘../.deps/lib/libbrewgpg-error.a’,
      ‘../.deps/lib/libbrewgpgme.a’, ‘../.deps/lib/libbrewintl.a’,
      ‘../.deps/opt/gpgme/lib/libbrewgpg-error.a’,
      ‘../.deps/opt/gpgme/lib/libbrewgpgme.a’,
      ‘../.deps/opt/gpgme/lib/libbrewintl.a’
  Found ‘___stdoutp’, possibly from ‘stdout’ (C)
    Objects: ‘../.deps/lib/libbrewgpg-error.a’,
      ‘../.deps/opt/gpgme/lib/libbrewgpg-error.a’
  Found ‘__exit’, possibly from ‘_exit’ (C), ‘_Exit’ (C)
    Objects: ‘../.deps/lib/libbrewassuan.a’,
      ‘../.deps/lib/libbrewgpg-error.a’, ‘../.deps/lib/libbrewgpgme.a’,
      ‘../.deps/opt/gpgme/lib/libbrewassuan.a’,
      ‘../.deps/opt/gpgme/lib/libbrewgpg-error.a’,
      ‘../.deps/opt/gpgme/lib/libbrewgpgme.a’
  Found ‘_abort’, possibly from ‘abort’ (C)
    Objects: ‘../.deps/lib/libbrewgpg-error.a’,
      ‘../.deps/lib/libbrewintl.a’,
      ‘../.deps/opt/gpgme/lib/libbrewgpg-error.a’,
      ‘../.deps/opt/gpgme/lib/libbrewintl.a’
  Found ‘_exit’, possibly from ‘exit’ (C)
    Objects: ‘../.deps/lib/libbrewgpg-error.a’,
      ‘../.deps/opt/gpgme/lib/libbrewgpg-error.a’
  Found ‘_sprintf’, possibly from ‘sprintf’ (C)
    Objects: ‘../.deps/lib/libbrewassuan.a’,
      ‘../.deps/lib/libbrewintl.a’,
      ‘../.deps/opt/gpgme/lib/libbrewassuan.a’,
      ‘../.deps/opt/gpgme/lib/libbrewintl.a’

Compiled code should not call entry points which might terminate R nor
write to stdout/stderr instead of to the console, nor use Fortran I/O
nor system RNGs nor [v]sprintf.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.