Make it compile on FreeBSD.

lib/capybara_webkit_builder.rb

@@ -3,23 +3,30 @@ require "fileutils"
 module CapybaraWebkitBuilder
   extend self
 
+  def make_bin
+    make_binaries = ['gmake', 'make']
+    make_binaries.detect { |make| system("which #{make}") }
+  end
+
   def makefile
     qmake_binaries = ['qmake', 'qmake-qt4']
     qmake = qmake_binaries.detect { |qmake| system("which #{qmake}") }
     case RUBY_PLATFORM
     when /linux/
       system("#{qmake} -spec linux-g++")
+    when /freebsd/
+      system("#{qmake} -spec freebsd-g++")
     else
       system("#{qmake} -spec macx-g++")
     end
   end
 
   def qmake
-    system("make qmake")
+    system("#{make_bin} qmake")
   end
 
   def build
-    system("make") or return false
+    system(make_bin) or return false
 
     FileUtils.mkdir("bin") unless File.directory?("bin")
     FileUtils.cp("src/webkit_server", "bin", :preserve => true)