https://bugs.gentoo.org/839639
https://github.com/SFML/SFML/commit/c9f7cb3d525a995912fc62507802f3f265de2728.patch
https://git.alpinelinux.org/aports/plain/community/sfml/musl-1.2.3.patch
--- a/src/SFML/Window/Unix/WindowImplX11.cpp
+++ b/src/SFML/Window/Unix/WindowImplX11.cpp
@@ -1556,7 +1556,7 @@
                                    m_window,
                                    XNInputStyle,
                                    XIMPreeditNothing | XIMStatusNothing,
-                                   reinterpret_cast<void*>(NULL));
+                                   reinterpret_cast<void*>(0));
     }
     else
     {