0.3.6 Broken on Mac

[serialx]

0.3.6 is broken on mac with the following error:

Installing gem posix-spawn-0.3.6
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/.gitignore
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/COPYING
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/Gemfile
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/HACKING
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/README.md
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/Rakefile
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/TODO
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/bin/posix-spawn-benchmark
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/ext/extconf.rb
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/ext/posix-spawn.c
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/lib/posix-spawn.rb
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/lib/posix/spawn.rb
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/lib/posix/spawn/child.rb
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/lib/posix/spawn/version.rb
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/posix-spawn.gemspec
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/test/test_backtick.rb
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/test/test_child.rb
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/test/test_popen.rb
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/test/test_spawn.rb
/Library/Ruby/Gems/1.8/gems/posix-spawn-0.3.6/test/test_system.rb
Building native extensions.  This could take a while...
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
creating Makefile
make "DESTDIR="
xcrun cc -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common -arch i386 -arch x86_64 -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common  -Wall   -c posix-spawn.c
In file included from posix-spawn.c:14:
In file included from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0/ruby.h:24:
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0/config.h:21:9: warning: '_GNU_SOURCE' macro redefined
#define _GNU_SOURCE 1
        ^
posix-spawn.c:3:9: note: previous definition is here
#define _GNU_SOURCE
        ^
1 warning generated.
In file included from posix-spawn.c:14:
In file included from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0/ruby.h:24:
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0/config.h:21:9: warning: '_GNU_SOURCE' macro redefined
#define _GNU_SOURCE 1
        ^
posix-spawn.c:3:9: note: previous definition is here
#define _GNU_SOURCE
        ^
1 warning generated.
cc -arch i386 -arch x86_64 -pipe -bundle -undefined dynamic_lookup -o posix_spawn_ext.bundle posix-spawn.o -L. -L/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib -L. -arch i386 -arch x86_64     -lruby  -lpthread -ldl -lobjc
make "DESTDIR=" install
/usr/bin/install -c -m 0755 posix_spawn_ext.bundle ./.gem.20130723-96852-r47vbj
ERROR:  While executing gem ... (NoMethodError)
    undefined method `join' for nil:NilClass

[rtomayko]

I believe this was fixed some time ago. Sorry to leave this open and stale for so long. Closing ...