diff --git a/compiler+runtime/include/cpp/jank/jit/processor.hpp b/compiler+runtime/include/cpp/jank/jit/processor.hpp
index e2e7743c..6c8d0ce9 100644
--- a/compiler+runtime/include/cpp/jank/jit/processor.hpp
+++ b/compiler+runtime/include/cpp/jank/jit/processor.hpp
@@ -14,17 +14,24 @@ namespace jank::runtime
 
 namespace jank::jit
 {
+
   struct processor
   {
-    processor(native_integer optimization_level);
+    processor(util::cli::options const &opts);
     ~processor();
 
     result<option<runtime::object_ptr>, native_persistent_string>
     eval(codegen::processor &cg_prc) const;
     void eval_string(native_persistent_string const &s) const;
-    void load_object(native_persistent_string_view const &path) const;
+    void load_object(native_persistent_string const &path) const;
+
+    result<void, native_persistent_string>
+    load_dynamic_libs(native_vector<native_persistent_string> const &libs) const;
+
+    option<native_persistent_string> find_dynamic_lib(native_persistent_string const &lib) const;
 
     std::unique_ptr<clang::Interpreter> interpreter;
     native_integer optimization_level{};
+    native_vector<boost::filesystem::path> library_dirs;
   };
 }
diff --git a/compiler+runtime/include/cpp/jank/runtime/context.hpp b/compiler+runtime/include/cpp/jank/runtime/context.hpp
index 078c9244..3d474d47 100644
--- a/compiler+runtime/include/cpp/jank/runtime/context.hpp
+++ b/compiler+runtime/include/cpp/jank/runtime/context.hpp
@@ -31,7 +31,6 @@ namespace jank::runtime
   {
     context();
     context(util::cli::options const &opts);
-    context(context const &);
     context(context &&) = delete;
     ~context();
 
diff --git a/compiler+runtime/include/cpp/jank/util/cli.hpp b/compiler+runtime/include/cpp/jank/util/cli.hpp
index 7d9eb3bc..329f53b5 100644
--- a/compiler+runtime/include/cpp/jank/util/cli.hpp
+++ b/compiler+runtime/include/cpp/jank/util/cli.hpp
@@ -20,6 +20,12 @@ namespace jank::util::cli
     native_bool profiler_enabled{};
     native_transient_string profiler_file{ "jank.profile" };
     native_bool gc_incremental{};
+    
+    /* Native dependencies */
+    native_vector<native_persistent_string> include_dirs;
+    native_vector<native_persistent_string> library_dirs;
+    native_vector<native_persistent_string> define_macros;
+    native_vector<native_persistent_string> libs;
 
     /* Compilation. */
     native_transient_string compilation_path{ "classes" };
diff --git a/compiler+runtime/src/cpp/jank/jit/processor.cpp b/compiler+runtime/src/cpp/jank/jit/processor.cpp
index f9aee618..1b07c1af 100644
--- a/compiler+runtime/src/cpp/jank/jit/processor.cpp
+++ b/compiler+runtime/src/cpp/jank/jit/processor.cpp
@@ -16,6 +16,18 @@
 
 namespace jank::jit
 {
+
+  native_persistent_string default_shared_lib_name(native_persistent_string const &lib)
+#if defined(__APPLE__)
+  {
+    return fmt::format("{}.dylib", lib);
+  }
+#elif defined(__linux__)
+  {
+    return fmt::format("lib{}.so", lib);
+  }
+#endif
+
   static void handle_fatal_llvm_error(void * const user_data,
                                       char const *message,
                                       native_bool const gen_crash_diag)
@@ -80,9 +92,14 @@ namespace jank::jit
     return output_path;
   }
 
-  processor::processor(native_integer const optimization_level)
-    : optimization_level{ optimization_level }
+  processor::processor(util::cli::options const &opts)
+    : optimization_level{ opts.optimization_level }
   {
+    for(auto const &library_dir : opts.library_dirs)
+    {
+      library_dirs.emplace_back(boost::filesystem::absolute(library_dir.c_str()));
+    }
+
     profile::timer timer{ "jit ctor" };
     /* TODO: Pass this into each fn below so we only do this once on startup. */
     auto const jank_path(util::process_location().unwrap().parent_path());
@@ -102,7 +119,7 @@ namespace jank::jit
 
     auto const include_path(jank_path / "../include");
 
-    native_persistent_string_view O{ "-O0" };
+    native_persistent_string O{ "-O0" };
     switch(optimization_level)
     {
       case 0:
@@ -137,7 +154,22 @@ namespace jank::jit
     args.emplace_back("-include-pch");
     args.emplace_back(strdup(pch_path_str.c_str()));
 
-    //fmt::println("jit flags {}", args);
+    for(auto const &include_path : opts.include_dirs)
+    {
+      args.emplace_back(strdup(fmt::format("-I{}", include_path).c_str()));
+    }
+
+    for(auto const &library_path : opts.library_dirs)
+    {
+      args.emplace_back(strdup(fmt::format("-L{}", library_path).c_str()));
+    }
+
+    for(auto const &define_macro : opts.define_macros)
+    {
+      args.emplace_back(strdup(fmt::format("-D{}", define_macro).c_str()));
+    }
+
+    // fmt::println("jit flags {}", args);
 
     clang::IncrementalCompilerBuilder compiler_builder;
     compiler_builder.SetCompilerArgs(args);
@@ -148,6 +180,12 @@ namespace jank::jit
     compiler_instance->LoadRequestedPlugins();
 
     interpreter = llvm::cantFail(clang::Interpreter::create(std::move(compiler_instance)));
+
+    auto const &load_result{ load_dynamic_libs(opts.libs) };
+    if(load_result.is_err())
+    {
+      throw std::runtime_error{ load_result.expect_err().c_str() };
+    }
   }
 
   processor::~processor()
@@ -199,4 +237,59 @@ namespace jank::jit
     auto err(interpreter->ParseAndExecute({ s.data(), s.size() }));
     llvm::logAllUnhandledErrors(std::move(err), llvm::errs(), "error: ");
   }
+
+  option<native_persistent_string>
+  processor::find_dynamic_lib(native_persistent_string const &lib) const
+  {
+    auto const &default_lib_name{ default_shared_lib_name(lib) };
+    for(auto const &lib_dir : library_dirs)
+    {
+      auto const default_lib_abs_path{ fmt::format("{}/{}", lib_dir.string(), default_lib_name) };
+      if(boost::filesystem::exists(default_lib_abs_path.c_str()))
+      {
+        return default_lib_abs_path;
+      }
+      else
+      {
+        auto const lib_abs_path{ fmt::format("{}/{}", lib_dir.string(), lib) };
+        if(boost::filesystem::exists(lib_abs_path))
+        {
+          return lib_abs_path;
+        }
+      }
+    }
+
+    return none;
+  }
+
+  result<void, native_persistent_string>
+  processor::load_dynamic_libs(native_vector<native_persistent_string> const &libs) const
+  {
+    for(auto const &lib : libs)
+    {
+      if(boost::filesystem::path{ lib.c_str() }.is_absolute())
+      {
+        load_object(lib);
+      }
+      else
+      {
+        auto const result{ processor::find_dynamic_lib(lib) };
+        if(result.is_none())
+        {
+          return err(fmt::format("Failed to load dynamic library `{}`", lib));
+        }
+        else
+        {
+          load_object(result.unwrap());
+        }
+      }
+    }
+
+    return ok();
+  }
+
+  void processor::load_object(native_persistent_string const &path) const
+  {
+    llvm::cantFail(interpreter->LoadDynamicLibrary(path.data()));
+  }
 }
diff --git a/compiler+runtime/src/cpp/jank/runtime/context.cpp b/compiler+runtime/src/cpp/jank/runtime/context.cpp
index d53244e8..f9f31df9 100644
--- a/compiler+runtime/src/cpp/jank/runtime/context.cpp
+++ b/compiler+runtime/src/cpp/jank/runtime/context.cpp
@@ -29,7 +29,7 @@ namespace jank::runtime
   }
 
   context::context(util::cli::options const &opts)
-    : jit_prc{ opts.optimization_level }
+    : jit_prc{ opts }
     , output_dir{ opts.compilation_path }
     , module_loader{ *this, opts.class_path }
   {
@@ -68,57 +68,6 @@ namespace jank::runtime
       .expect_ok();
   }
 
-  /* TODO: Remove this. */
-  context::context(context const &ctx)
-    : jit_prc{ ctx.jit_prc.optimization_level }
-    , module_dependencies{ ctx.module_dependencies }
-    , output_dir{ ctx.output_dir }
-    , module_loader{ *this, ctx.module_loader.paths }
-  {
-    {
-      auto ns_lock(namespaces.wlock());
-      for(auto const &ns : *ctx.namespaces.rlock())
-      {
-        ns_lock->insert({ ns.first, ns.second->clone(*this) });
-      }
-      *keywords.wlock() = *ctx.keywords.rlock();
-    }
-
-    auto &tbfs(thread_binding_frames[this]);
-    auto const &other_tbfs(thread_binding_frames[&ctx]);
-    for(auto const &v : other_tbfs)
-    {
-      thread_binding_frame frame{ obj::persistent_hash_map::empty() };
-      for(auto it(v.bindings->fresh_seq()); it != nullptr; it = runtime::next_in_place(it))
-      {
-        auto const entry(it->first());
-        auto const var(expect_object<var>(entry->data[0]));
-        auto const value(entry->data[1]);
-        auto const new_var(intern_var(var->n->name->name, var->name->name).expect_ok());
-        frame.bindings = frame.bindings->assoc(new_var, value);
-      }
-
-      /* We push to the back, since we're looping from the front of the other list. If we
-       * pushed to the front of this one, we'd reverse the order. */
-      tbfs.push_back(std::move(frame));
-    }
-
-    auto const core(intern_ns(make_box<obj::symbol>("clojure.core")));
-    current_ns_var = core->intern_var(make_box<obj::symbol>("clojure.core/*ns*"));
-
-    in_ns_var = intern_var(make_box<obj::symbol>("clojure.core/in-ns")).expect_ok();
-    compile_files_var
-      = intern_var(make_box<obj::symbol>("clojure.core/*compile-files*")).expect_ok();
-    assert_var = core->intern_var(make_box<obj::symbol>("clojure.core/*assert*"));
-
-    current_module_var
-      = make_box<runtime::var>(core, make_box<obj::symbol>("*current-module*"))->set_dynamic(true);
-    no_recur_var
-      = make_box<runtime::var>(core, make_box<obj::symbol>("*no-recur*"))->set_dynamic(true);
-    gensym_env_var
-      = make_box<runtime::var>(core, make_box<obj::symbol>("*gensym-env*"))->set_dynamic(true);
-  }
-
   context::~context()
   {
     thread_binding_frames.erase(this);
diff --git a/compiler+runtime/src/cpp/jank/util/cli.cpp b/compiler+runtime/src/cpp/jank/util/cli.cpp
index d627f817..80122fe5 100644
--- a/compiler+runtime/src/cpp/jank/util/cli.cpp
+++ b/compiler+runtime/src/cpp/jank/util/cli.cpp
@@ -27,6 +27,20 @@ namespace jank::util::cli
     cli.add_option("-O,--optimization", opts.optimization_level, "The optimization level to use")
       ->check(CLI::Range(0, 3));
 
+    /* TODO: new category */
+    cli.add_option("-I,--include-dir",
+                   opts.include_dirs,
+                   "Absolute or relative path to the directory for includes resolution. Accepts multiple values");
+    cli.add_option("-L,--library-dir",
+                   opts.library_dirs,
+                   "Absolute or relative path to the directory to search dynamic libraries in. Accepts multiple values");
+    cli.add_option("-D,--define-macro",
+                   opts.define_macros,
+                   "Defines macro value, sets to 1 if omitted. Accepts multiple values");
+    cli.add_option("-l",
+                   opts.libs,
+                   "Library identifiers, absolute or relative paths eg. -lfoo for libfoo.so or foo.dylib. Accepts multiple values");
+
     /* Run subcommand. */
     auto &cli_run(*cli.add_subcommand("run", "Load and run a file"));
     cli_run.fallthrough();