extconf.rb in ruby-eigen-0.0.10.pre1

- old
+ new
@@ -1,5 +1,40 @@
 require 'mkmf'
-$CXXFLAGS = ($CXXFLAGS || "") + " -O2 -Wall "
-dir_config('eigen')
+eigen3_opt = dir_config('eigen')
 have_library("c++") or have_library("stdc++")
+
+unless eigen3_opt[0]
+  eigen3_path = File.join( File.dirname(File.expand_path(__FILE__)), "eigen3")
+  $CXXFLAGS = ($CXXFLAGS || "") + " -I#{eigen3_path} "
+end
+
+$CXXFLAGS = ($CXXFLAGS || "") + " -O2 -Wall "
 create_makefile('eigen/eigen')
+
+
+# a monkey patch to make cc_command into cxx_command
+# module MakeMakefile
+#   def cc_command(opt="")
+#     conf = RbConfig::CONFIG.merge('hdrdir' => $hdrdir.quote, 'srcdir' => $srcdir.quote,
+#                                   'arch_hdrdir' => $arch_hdrdir.quote,
+#                                   'top_srcdir' => $top_srcdir.quote)
+#     RbConfig::expand("$(CXX) #$INCFLAGS #$CPPFLAGS #$CXXFLAGS #$ARCH_FLAG #{opt} -c #{CONFTEST_C}",
+#                      conf)
+#   end
+# end
+
+# guess where eigen3 headers unless --with-eigen-include given.
+
+# unless eigen3_opt[0]
+#   case RbConfig::CONFIG["includedir"]
+#   when /(.*)Cellar\/ruby((?!Cellar).)+\z/   # Homebrew
+#     eigen3_path = File.join($1, "include/eigen3")
+#   when "/usr/local/include"                 # Ubuntu
+#     eigen3_path = "/usr/include/eigen3"
+#   else                                      # MacPorts?
+#     eigen3_path = File.join(RbConfig::CONFIG["includedir"], "eigen3")
+#   end
+
+#   if try_compile("#include <Eigen/Core>", "-I" + eigen3_path)
+#       $CXXFLAGS = ($CXXFLAGS || "") + " -I#{eigen3_path} "
+#   end
+# end