Currently, gitlab supports only Debian based OS where scripts are installed under /etc/init.d/ by default. Patches below has few improvements to the gitlab check and task_helper rake scripts to verify whether init script was installed on FreeBSD machine.

check.rake

diff --git a/lib/tasks/gitlab/check.rake b/lib/tasks/gitlab/check.rake
index a57c349..3253e16 100644
--- a/lib/tasks/gitlab/check.rake
+++ b/lib/tasks/gitlab/check.rake
@@ -118,7 +118,7 @@ namespace :gitlab do
     def check_init_script_exists
       print "Init script exists? ... "
 
-      script_path = "/etc/init.d/gitlab"
+      script_path = get_init_script_syspath
 
       if File.exists?(script_path)
         puts "yes".green
@@ -137,13 +137,15 @@ namespace :gitlab do
     def check_init_script_up_to_date
       print "Init script up-to-date? ... "
 
-      script_path = "/etc/init.d/gitlab"
+      script_path = get_init_script_syspath
+
       unless File.exists?(script_path)
         puts "can't check because of previous errors".magenta
         return
       end
 
-      recipe_content = `curl https://raw.github.com/gitlabhq/gitlab-recipes/5-1-stable/init.d/gitlab 2>/dev/null`
+      recipe_content_url = get_recipe_content_url
+      recipe_content = `curl #{recipe_content_url} 2>/dev/null`
       script_content = File.read(script_path)
 
       if recipe_content == script_content
@@ -620,6 +622,33 @@ namespace :gitlab do
     end
   end
 
+  def get_init_script_syspath
+    init_script_path = 
+     if "#{RUBY_PLATFORM}".include?('freebsd')
+            "/usr/local/etc/rc.d/gitlab"
+	elsif "#{RUBY_PLATFORM}".include?('darwin')
+            # in case somebody would create a LunchDaemon plist for OS X
+            "/Library/LaunchDaemons/org.gitlab.daemon.plist"
+	else
+            # default is Linux
+            "/etc/init.d/gitlab"
+    	end
+
+    return init_script_path
+  end
+
+  def get_recipe_content_url
+    recipe_content_url =
+	if "#{RUBY_PLATFORM}".include?('freebsd')
+            "https://gist.github.com/denvazh/5588936/raw/a99653679831368b7029ae0959e18da68799bff4/gitlab"
+	else
+            # default is Linux
+            "https://raw.github.com/gitlabhq/gitlab-recipes/5-1-stable/init.d/gitlab"
+	end
+
+    return recipe_content_url
+  end
+
   def finished_checking(component)
     puts ""
     puts "Checking #{component.yellow} ... #{"Finished".green}"

task_helpers.rake

diff --git a/lib/tasks/gitlab/task_helpers.rake b/lib/tasks/gitlab/task_helpers.rake
index 34a4a32..335aeee 100644
--- a/lib/tasks/gitlab/task_helpers.rake
+++ b/lib/tasks/gitlab/task_helpers.rake
@@ -35,6 +35,9 @@ namespace :gitlab do
     os_name ||= if File.readable?('/etc/os-release')
                   File.read('/etc/os-release').match(/PRETTY_NAME=\"(.+)\"/)[1]
                 end
+    os_name ||= if bsd_version = run("uname -rs")
+    		"#{bsd_version}"
+		end
     os_name.try(:squish!)
   end
 

How to apply patches

Directly from github like this:

curl "https://gist.github.com/denvazh/5573930/raw/9b7380bbac5ba496f5cf87b54fe6240925f7ab4d/task_helpers.rake" | git apply -

curl "https://gist.github.com/denvazh/5573930/raw/2670867f8c8089c89a10ba4c7d923054c8e86f36/check.rake" | git apply -