Unable To Install posix-spawn on FreeBSD - ruby

Question

I am attempting to get octopress going and having trouble installing the required package posix-spawn.
Here this is the error output:
ERROR: Error installing posix-spawn:
ERROR: Failed to build gem native extension.
/home/private/.rvm/rubies/ruby-1.9.3-p392/bin/ruby extconf.rb
creating Makefile
make
compiling posix-spawn.c
posix-spawn.c:9:19: error: spawn.h: No such file or directory
In file included from /home/private/.rvm/rubies/ruby-1.9.3-p392/include/ruby- 1.9.1/ruby/ruby.h:24,
from /home/private/.rvm/rubies/ruby-1.9.3-p392/include/ruby-1.9.1/ruby.h:32,
from posix-spawn.c:14:
/home/private/.rvm/rubies/ruby-1.9.3-p392/include/ruby-1.9.1/i386- freebsd8.3/ruby/config.h:17:1: warning: "_GNU_SOURCE" redefined
posix-spawn.c:3:1: warning: this is the location of the previous definition
posix-spawn.c:103: error: expected declaration specifiers or '...' before 'posix_spawn_file_actions_t'
posix-spawn.c: In function 'posixspawn_file_actions_addclose':
posix-spawn.c:113: warning: implicit declaration of function 'posix_spawn_file_actions_addclose'
posix-spawn.c:113: error: 'fops' undeclared (first use in this function)
posix-spawn.c:113: error: (Each undeclared identifier is reported only once
posix-spawn.c:113: error: for each function it appears in.)
posix-spawn.c: At top level:
posix-spawn.c:129: error: expected declaration specifiers or '...' before 'posix_spawn_file_actions_t'
posix-spawn.c: In function 'posixspawn_file_actions_adddup2':
posix-spawn.c:141: warning: implicit declaration of function 'posix_spawn_file_actions_adddup2'
posix-spawn.c:141: error: 'fops' undeclared (first use in this function)
posix-spawn.c: At top level:
posix-spawn.c:155: error: expected declaration specifiers or '...' before 'posix_spawn_file_actions_t'
posix-spawn.c: In function 'posixspawn_file_actions_addopen':
posix-spawn.c:173: warning: implicit declaration of function 'posix_spawn_file_actions_addopen'
posix-spawn.c:173: error: 'fops' undeclared (first use in this function)
posix-spawn.c: At top level:
posix-spawn.c:186: error: expected declaration specifiers or '...' before 'posix_spawn_file_actions_t'
posix-spawn.c: In function 'posixspawn_file_actions_operations_iter':
posix-spawn.c:190: error: 'fops' undeclared (first use in this function)
posix-spawn.c:190: error: too many arguments to function 'posixspawn_file_actions_addclose'
posix-spawn.c:193: error: too many arguments to function 'posixspawn_file_actions_adddup2'
posix-spawn.c:196: error: too many arguments to function 'posixspawn_file_actions_addopen'
posix-spawn.c: At top level:
posix-spawn.c:210: error: expected ')' before '*' token
posix-spawn.c:230: error: expected declaration specifiers or '...' before 'posix_spawnattr_t'
posix-spawn.c: In function 'posixspawn_set_pgroup':
posix-spawn.c:237: error: 'POSIX_SPAWN_SETPGROUP' undeclared (first use in this function)
posix-spawn.c:238: warning: implicit declaration of function 'posix_spawnattr_setpgroup'
posix-spawn.c:238: error: 'pattr' undeclared (first use in this function)
posix-spawn.c: In function 'each_env_check_i':
posix-spawn.c:253: warning: unused parameter 'arg'
posix-spawn.c: In function 'rb_posixspawn_pspawn':
posix-spawn.c:330: error: 'posix_spawn_file_actions_t' undeclared (first use in this function)
posix-spawn.c:330: error: expected ';' before 'fops'
posix-spawn.c:331: error: 'posix_spawnattr_t' undeclared (first use in this function)
posix-spawn.c:331: error: expected ';' before 'attr'
posix-spawn.c:332: warning: ISO C90 forbids mixed declarations and code
posix-spawn.c:341: warning: ISO C90 forbids mixed declarations and code
posix-spawn.c:381: warning: ISO C90 forbids mixed declarations and code
posix-spawn.c:391: warning: implicit declaration of function 'posixspawn_file_actions_init'
posix-spawn.c:391: error: 'fops' undeclared (first use in this function)
posix-spawn.c:392: warning: implicit declaration of function 'posix_spawnattr_init'
posix-spawn.c:392: error: 'attr' undeclared (first use in this function)
posix-spawn.c:395: error: 'POSIX_SPAWN_SETSIGMASK' undeclared (first use in this function)
posix-spawn.c:397: warning: implicit declaration of function 'posix_spawnattr_setsigmask'
posix-spawn.c:407: error: too many arguments to function 'posixspawn_set_pgroup'
posix-spawn.c:409: warning: implicit declaration of function 'posix_spawnattr_setflags'
posix-spawn.c:418: warning: implicit declaration of function 'posix_spawnp'
posix-spawn.c:427: warning: implicit declaration of function 'posix_spawn_file_actions_destroy'
posix-spawn.c:428: warning: implicit declaration of function 'posix_spawnattr_destroy'
posix-spawn.c:320: warning: unused parameter 'self'
*** Error code 1
I found this comment in Github that says to make sure spawn.h is in my /usr/include/ folder, but that seemed to have no effect.
Any other thoughts?

Answer 1

This problem was solved by the author but apparently never made its way into the ruby gems repo. You can see about it here.
You can clone the repo and compile it locally and this did the trick for me:
git clone https://github.com/rtomayko/posix-spawn.git
cd posix-spawn/
gem build posix-spawn.gemspec
gem install posix-spawn*.gem