wip: use mini_portile 2.9.0.rc1 to simplify extconf

note we drop ruby_memcheck for now because it depends on nokogiri
which (on platforms for which precompiled gems aren't available)
transitively depends on a different version of mini_portile

Gemfile

@@ -8,4 +8,4 @@ gem("rake-compiler-dock", "1.3.0")
 gem("rdoc", "6.5.0")
 gem("psych", "5.1.0")
 
-gem("ruby_memcheck", "2.1.2") if Gem::Platform.local.os == "linux"
+#gem("ruby_memcheck", "2.1.2") if Gem::Platform.local.os == "linux"

ext/sqlite3/extconf.rb

@@ -65,29 +65,8 @@ def configure_packaged_libraries
           unless File.exist?(File.join(recipe.target, recipe.host, recipe.name, recipe.version))
             recipe.cook
           end
-          recipe.activate
 
-          # on macos, pkg-config will not return --cflags without this
-          ENV["PKG_CONFIG_ALLOW_SYSTEM_CFLAGS"] = "t"
-
-          # only needed for Ruby 3.1.3, see https://bugs.ruby-lang.org/issues/19233
-          RbConfig::CONFIG["PKG_CONFIG"] = config_string("PKG_CONFIG") || "pkg-config"
-
-          lib_path = File.join(recipe.path, "lib")
-          pcfile = File.join(lib_path, "pkgconfig", "sqlite3.pc")
-          abort_pkg_config("pkg_config") unless pkg_config(pcfile)
-
-          # see https://bugs.ruby-lang.org/issues/18490
-          ldflags = xpopen(["pkg-config", "--libs", "--static", pcfile], err: [:child, :out], &:read)
-          abort_pkg_config("xpopen") unless $?.success?
-          ldflags = ldflags.split
-
-          # see https://github.com/flavorjones/mini_portile/issues/118
-          "-L#{lib_path}".tap do |lib_path_flag|
-            ldflags.prepend(lib_path_flag) unless ldflags.include?(lib_path_flag)
-          end
-
-          ldflags.each { |ldflag| append_ldflags(ldflag) }
+          recipe.mkmf_config(pkg: "sqlite3")
         end
       end
 
@@ -131,6 +110,8 @@ def configure_extension
       end
 
       def minimal_recipe
+        require "rubygems"
+        gem "mini_portile2", "2.9.0.rc1" # gemspec is not respected at install time
         require "mini_portile2"
 
         MiniPortile.new(libname, sqlite3_config[:version]).tap do |recipe|

sqlite3.gemspec

@@ -108,7 +108,7 @@ Gem::Specification.new do |s|
   ]
   s.rdoc_options = ["--main", "README.md"]
 
-  s.add_dependency("mini_portile2", "~> 2.8.0")
+  s.add_dependency("mini_portile2", "2.9.0.rc1")
 
   s.extensions << "ext/sqlite3/extconf.rb"
 end