diff --git a/SConstruct b/SConstruct
index b9698601c35c..7578a7c38569 100644
--- a/SConstruct
+++ b/SConstruct
@@ -118,7 +118,6 @@ opts.Add(BoolVariable('use_precise_math_checks', 'Math checks use very precise e
 
 # Components
 opts.Add(BoolVariable('deprecated', "Enable deprecated features", True))
-opts.Add(BoolVariable('gdscript', "Enable GDScript support", True))
 opts.Add(BoolVariable('minizip', "Enable ZIP archive support using minizip", True))
 opts.Add(BoolVariable('xaudio2', "Enable the XAudio2 audio driver", False))
 
@@ -477,8 +476,6 @@ if selected_platform in platform_list:
             sys.exit(255)
         else:
             env.Append(CPPDEFINES=['_3D_DISABLED'])
-    if env['gdscript']:
-        env.Append(CPPDEFINES=['GDSCRIPT_ENABLED'])
     if env['disable_advanced_gui']:
         if env['tools']:
             print("Build option 'disable_advanced_gui=yes' cannot be used with 'tools=yes' (editor), only with 'tools=no' (export template).")
diff --git a/editor/editor_themes.cpp b/editor/editor_themes.cpp
index 8037045e7733..28bc20a9574f 100644
--- a/editor/editor_themes.cpp
+++ b/editor/editor_themes.cpp
@@ -35,7 +35,11 @@
 #include "editor_icons.gen.h"
 #include "editor_scale.h"
 #include "editor_settings.h"
+
+#include "modules/modules_enabled.gen.h"
+#ifdef MODULE_SVG_ENABLED
 #include "modules/svg/image_loader_svg.h"
+#endif
 
 static Ref<StyleBoxTexture> make_stylebox(Ref<Texture> p_texture, float p_left, float p_top, float p_right, float p_botton, float p_margin_left = -1, float p_margin_top = -1, float p_margin_right = -1, float p_margin_botton = -1, bool p_draw_center = true) {
 	Ref<StyleBoxTexture> style(memnew(StyleBoxTexture));
@@ -109,7 +113,7 @@ Ref<ImageTexture> editor_generate_icon(int p_index, bool p_convert_color, float
 
 void editor_register_and_generate_icons(Ref<Theme> p_theme, bool p_dark_theme = true, int p_thumb_size = 32, bool p_only_thumbs = false) {
 
-#ifdef SVG_ENABLED
+#ifdef MODULE_SVG_ENABLED
 	// The default icon theme is designed to be used for a dark theme.
 	// This dictionary stores color codes to convert to other colors
 	// for better readability on a light theme.
diff --git a/editor/import/editor_scene_importer_gltf.cpp b/editor/import/editor_scene_importer_gltf.cpp
index fc9c877ac756..d4664e1bb933 100644
--- a/editor/import/editor_scene_importer_gltf.cpp
+++ b/editor/import/editor_scene_importer_gltf.cpp
@@ -29,6 +29,7 @@
 /*************************************************************************/
 
 #include "editor_scene_importer_gltf.h"
+
 #include "core/crypto/crypto_core.h"
 #include "core/io/json.h"
 #include "core/math/disjoint_set.h"
diff --git a/editor/plugin_config_dialog.cpp b/editor/plugin_config_dialog.cpp
index 07b87633a923..1506ba319c4c 100644
--- a/editor/plugin_config_dialog.cpp
+++ b/editor/plugin_config_dialog.cpp
@@ -35,9 +35,13 @@
 #include "editor/editor_plugin.h"
 #include "editor/editor_scale.h"
 #include "editor/project_settings_editor.h"
-#include "modules/gdscript/gdscript.h"
 #include "scene/gui/grid_container.h"
 
+#include "modules/modules_enabled.gen.h"
+#ifdef MODULE_GDSCRIPT_ENABLED
+#include "modules/gdscript/gdscript.h"
+#endif
+
 void PluginConfigDialog::_clear_fields() {
 	name_edit->set_text("");
 	subfolder_edit->set_text("");
@@ -75,6 +79,9 @@ void PluginConfigDialog::_on_confirmed() {
 		// TODO Use script templates. Right now, this code won't add the 'tool' annotation to other languages.
 		// TODO Better support script languages with named classes (has_named_classes).
 
+		// FIXME: It's hacky to have hardcoded access to the GDScript module here.
+		// The editor code should not have to know what languages are enabled.
+#ifdef MODULE_GDSCRIPT_ENABLED
 		if (lang_name == GDScriptLanguage::get_singleton()->get_name()) {
 			// Hard-coded GDScript template to keep usability until we use script templates.
 			Ref<Script> gdscript = memnew(GDScript);
@@ -95,12 +102,15 @@ void PluginConfigDialog::_on_confirmed() {
 			ResourceSaver::save(script_path, gdscript);
 			script = gdscript;
 		} else {
+#endif
 			String script_path = path.plus_file(script_edit->get_text());
 			String class_name = script_path.get_file().get_basename();
 			script = ScriptServer::get_language(lang_idx)->get_template(class_name, "EditorPlugin");
 			script->set_path(script_path);
 			ResourceSaver::save(script_path, script);
+#ifdef MODULE_GDSCRIPT_ENABLED
 		}
+#endif
 
 		emit_signal("plugin_ready", script.operator->(), active_edit->is_pressed() ? subfolder_edit->get_text() : "");
 	} else {
@@ -229,9 +239,11 @@ PluginConfigDialog::PluginConfigDialog() {
 	for (int i = 0; i < ScriptServer::get_language_count(); i++) {
 		ScriptLanguage *lang = ScriptServer::get_language(i);
 		script_option_edit->add_item(lang->get_name());
+#ifdef MODULE_GDSCRIPT_ENABLED
 		if (lang == GDScriptLanguage::get_singleton()) {
 			default_lang = i;
 		}
+#endif
 	}
 	script_option_edit->select(default_lang);
 	grid->add_child(script_option_edit);
diff --git a/main/tests/test_gdscript.cpp b/main/tests/test_gdscript.cpp
index a6ef0e9cf400..a2891de8ff12 100644
--- a/main/tests/test_gdscript.cpp
+++ b/main/tests/test_gdscript.cpp
@@ -34,7 +34,8 @@
 #include "core/os/main_loop.h"
 #include "core/os/os.h"
 
-#ifdef GDSCRIPT_ENABLED
+#include "modules/modules_enabled.gen.h"
+#ifdef MODULE_GDSCRIPT_ENABLED
 
 #include "modules/gdscript/gdscript.h"
 #include "modules/gdscript/gdscript_compiler.h"
@@ -1091,7 +1092,7 @@ MainLoop *test(TestType p_type) {
 namespace TestGDScript {
 
 MainLoop *test(TestType p_type) {
-
+	ERR_PRINT("The GDScript module is disabled, therefore GDScript tests cannot be used.");
 	return NULL;
 }
 } // namespace TestGDScript
diff --git a/main/tests/test_string.cpp b/main/tests/test_string.cpp
index 9e8c8706ff48..eef3d9b84c79 100644
--- a/main/tests/test_string.cpp
+++ b/main/tests/test_string.cpp
@@ -28,15 +28,19 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
-#include "core/ustring.h"
-#include <wchar.h>
-//#include "core/math/math_funcs.h"
+#include "test_string.h"
+
 #include "core/io/ip_address.h"
 #include "core/os/os.h"
+#include "core/ustring.h"
+
+#include "modules/modules_enabled.gen.h"
+#ifdef MODULE_REGEX_ENABLED
 #include "modules/regex/regex.h"
-#include <stdio.h>
+#endif
 
-#include "test_string.h"
+#include <stdio.h>
+#include <wchar.h>
 
 namespace TestString {
 
diff --git a/modules/freetype/SCsub b/modules/freetype/SCsub
index 8f4a8de895ce..7b66aa1c766b 100644
--- a/modules/freetype/SCsub
+++ b/modules/freetype/SCsub
@@ -102,5 +102,3 @@ if env['builtin_freetype']:
 
 # Godot source files
 env_freetype.add_source_files(env.modules_sources, "*.cpp")
-# Used in scene/, needs to be in main env
-env.Append(CPPDEFINES=['FREETYPE_ENABLED'])
diff --git a/modules/recast/navigation_mesh_generator.cpp b/modules/recast/navigation_mesh_generator.cpp
index c67136b814ab..b6f5b38038da 100644
--- a/modules/recast/navigation_mesh_generator.cpp
+++ b/modules/recast/navigation_mesh_generator.cpp
@@ -29,6 +29,7 @@
 /*************************************************************************/
 
 #include "navigation_mesh_generator.h"
+
 #include "core/math/quick_hull.h"
 #include "core/os/thread.h"
 #include "editor/editor_settings.h"
@@ -45,10 +46,10 @@
 #include "scene/resources/shape.h"
 #include "scene/resources/sphere_shape.h"
 
+#include "modules/modules_enabled.gen.h"
 #ifdef MODULE_CSG_ENABLED
 #include "modules/csg/csg_shape.h"
 #endif
-
 #ifdef MODULE_GRIDMAP_ENABLED
 #include "modules/gridmap/grid_map.h"
 #endif
diff --git a/modules/svg/SCsub b/modules/svg/SCsub
index 9324c1634b66..7961d1f33e7d 100644
--- a/modules/svg/SCsub
+++ b/modules/svg/SCsub
@@ -13,10 +13,6 @@ thirdparty_sources = [
 thirdparty_sources = [thirdparty_dir + file for file in thirdparty_sources]
 
 env_svg.Prepend(CPPPATH=[thirdparty_dir])
-# FIXME: Needed in editor/editor_themes.cpp for now, but ideally there
-# shouldn't be a dependency on modules/ and its own 3rd party deps.
-env.Prepend(CPPPATH=[thirdparty_dir])
-env.Append(CPPDEFINES=["SVG_ENABLED"])
 
 env_thirdparty = env_svg.Clone()
 env_thirdparty.disable_warnings()
diff --git a/modules/svg/image_loader_svg.cpp b/modules/svg/image_loader_svg.cpp
index 11ae2f81bf93..7f91908a3386 100644
--- a/modules/svg/image_loader_svg.cpp
+++ b/modules/svg/image_loader_svg.cpp
@@ -30,9 +30,8 @@
 
 #include "image_loader_svg.h"
 
-#include "core/os/os.h"
-#include "core/print_string.h"
-#include "core/ustring.h"
+#include <nanosvg.h>
+#include <nanosvgrast.h>
 
 void SVGRasterizer::rasterize(NSVGimage *p_image, float p_tx, float p_ty, float p_scale, unsigned char *p_dst, int p_w, int p_h, int p_stride) {
 	nsvgRasterize(rasterizer, p_image, p_tx, p_ty, p_scale, p_dst, p_w, p_h, p_stride);
diff --git a/modules/svg/image_loader_svg.h b/modules/svg/image_loader_svg.h
index 9e9366e91bb3..24cee824803f 100644
--- a/modules/svg/image_loader_svg.h
+++ b/modules/svg/image_loader_svg.h
@@ -34,13 +34,14 @@
 #include "core/io/image_loader.h"
 #include "core/ustring.h"
 
-#include <nanosvg.h>
-#include <nanosvgrast.h>
-
 /**
 	@author Daniel Ramirez <djrmuv@gmail.com>
 */
 
+// Forward declare and include thirdparty headers in .cpp.
+struct NSVGrasterizer;
+struct NSVGimage;
+
 class SVGRasterizer {
 
 	NSVGrasterizer *rasterizer;
diff --git a/scene/gui/rich_text_label.cpp b/scene/gui/rich_text_label.cpp
index 6c2928c65c2d..af5d0e2f4514 100644
--- a/scene/gui/rich_text_label.cpp
+++ b/scene/gui/rich_text_label.cpp
@@ -33,8 +33,13 @@
 #include "core/math/math_defs.h"
 #include "core/os/keyboard.h"
 #include "core/os/os.h"
-#include "modules/regex/regex.h"
 #include "scene/scene_string_names.h"
+
+#include "modules/modules_enabled.gen.h"
+#ifdef MODULE_REGEX_ENABLED
+#include "modules/regex/regex.h"
+#endif
+
 #ifdef TOOLS_ENABLED
 #include "editor/editor_scale.h"
 #endif
@@ -2864,6 +2869,7 @@ Dictionary RichTextLabel::parse_expressions_for_values(Vector<String> p_expressi
 
 		Vector<String> values = parts[1].split(",", false);
 
+#ifdef MODULE_REGEX_ENABLED
 		RegEx color = RegEx();
 		color.compile("^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$");
 		RegEx nodepath = RegEx();
@@ -2897,6 +2903,7 @@ Dictionary RichTextLabel::parse_expressions_for_values(Vector<String> p_expressi
 				a.append(values[j]);
 			}
 		}
+#endif
 
 		if (values.size() > 1) {
 			d[key] = a;
diff --git a/scene/resources/dynamic_font.cpp b/scene/resources/dynamic_font.cpp
index d19d82d25285..451029e93bec 100644
--- a/scene/resources/dynamic_font.cpp
+++ b/scene/resources/dynamic_font.cpp
@@ -28,8 +28,11 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
-#ifdef FREETYPE_ENABLED
+#include "modules/modules_enabled.gen.h"
+#ifdef MODULE_FREETYPE_ENABLED
+
 #include "dynamic_font.h"
+
 #include "core/os/file_access.h"
 #include "core/os/os.h"
 
diff --git a/scene/resources/dynamic_font.h b/scene/resources/dynamic_font.h
index 2dafd3ce4f93..917076751242 100644
--- a/scene/resources/dynamic_font.h
+++ b/scene/resources/dynamic_font.h
@@ -31,7 +31,9 @@
 #ifndef DYNAMIC_FONT_H
 #define DYNAMIC_FONT_H
 
-#ifdef FREETYPE_ENABLED
+#include "modules/modules_enabled.gen.h"
+#ifdef MODULE_FREETYPE_ENABLED
+
 #include "core/io/resource_loader.h"
 #include "core/os/mutex.h"
 #include "core/os/thread_safe.h"