diff --git a/meson.build b/meson.build
index 27cefa4c9c..042742aa07 100644
--- a/meson.build
+++ b/meson.build
@@ -86,6 +86,7 @@ sdl_image = '@0@_image'.format(sdl)
 
 if sdl_api == 3
     add_global_arguments('-DPG_SDL3=1', language: 'c')
+    add_global_arguments('-DSDL_ENABLE_OLD_NAMES=1', language: 'c')
 endif
 
 pg_inc_dirs = []
diff --git a/src_c/bufferproxy.c b/src_c/bufferproxy.c
index 318e0ad0f4..1c41fa0813 100644
--- a/src_c/bufferproxy.c
+++ b/src_c/bufferproxy.c
@@ -34,6 +34,7 @@
 #include "pgcompat.h"
 #include "pgbufferproxy.h"
 #include "doc/bufferproxy_doc.h"
+#include <stddef.h>
 
 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
 #define BUFPROXY_MY_ENDIAN '<'
diff --git a/src_c/geometry.h b/src_c/geometry.h
index aa9cae6ca1..9d13f9fdae 100644
--- a/src_c/geometry.h
+++ b/src_c/geometry.h
@@ -3,6 +3,7 @@
 
 #include "pygame.h"
 #include "pgcompat.h"
+#include <stddef.h>
 
 typedef struct {
     double x, y, r;
diff --git a/src_c/meson.build b/src_c/meson.build
index 70286af44e..9804e7cdfe 100644
--- a/src_c/meson.build
+++ b/src_c/meson.build
@@ -84,8 +84,6 @@ mouse = py.extension_module(
 )
 endif
 
-# TODO: support SDL3
-if sdl_api != 3
 rect = py.extension_module(
     'rect',
     ['rect.c', 'pgcompat_rect.c'],
@@ -94,7 +92,6 @@ rect = py.extension_module(
     install: true,
     subdir: pg,
 )
-endif
 
 # TODO: support SDL3
 if sdl_api != 3
@@ -275,8 +272,6 @@ mask = py.extension_module(
 )
 endif
 
-# TODO: support SDL3
-if sdl_api != 3
 bufferproxy = py.extension_module(
     'bufferproxy',
     'bufferproxy.c',
@@ -285,7 +280,6 @@ bufferproxy = py.extension_module(
     install: true,
     subdir: pg,
 )
-endif
 
 # TODO: support SDL3
 if sdl_api != 3
@@ -299,8 +293,6 @@ pixelarray = py.extension_module(
 )
 endif
 
-# TODO: support SDL3
-if sdl_api != 3
 math = py.extension_module(
     'math',
     'math.c',
@@ -309,7 +301,6 @@ math = py.extension_module(
     install: true,
     subdir: pg,
 )
-endif
 
 # TODO: support SDL3
 if sdl_api != 3
@@ -323,8 +314,6 @@ pixelcopy = py.extension_module(
 )
 endif
 
-# TODO: support SDL3
-if sdl_api != 3
 newbuffer = py.extension_module(
     'newbuffer',
     'newbuffer.c',
@@ -333,7 +322,6 @@ newbuffer = py.extension_module(
     install: true,
     subdir: pg,
 )
-endif
 
 # new/experimental/uncommon stuff, but built by default
 # TODO: support SDL3
@@ -348,8 +336,6 @@ system = py.extension_module(
 )
 endif
 
-# TODO: support SDL3
-if sdl_api != 3
 geometry = py.extension_module(
     'geometry',
     'geometry.c',
@@ -358,7 +344,6 @@ geometry = py.extension_module(
     install: true,
     subdir: pg,
 )
-endif
 
 # TODO: support SDL3
 if sdl_api != 3