This workaround patch should be removable when musl implements C23
functions (technically this isn't a __GLIBC__-only quirk, but used
due to lack of anything known that's better beside running a build
test for it).

https://bugs.gentoo.org/926488
https://github.com/simd-everywhere/simde/issues/1001
--- a/simde/simde-math.h
+++ b/simde/simde-math.h
@@ -1268,3 +1268,3 @@
   #if \
-     ((!defined(HEDLEY_EMSCRIPTEN_VERSION) || HEDLEY_EMSCRIPTEN_VERSION_CHECK(3, 1, 43)) && HEDLEY_HAS_BUILTIN(__builtin_roundeven)) || \
+     (defined(__GLIBC__) && (!defined(HEDLEY_EMSCRIPTEN_VERSION) || HEDLEY_EMSCRIPTEN_VERSION_CHECK(3, 1, 43)) && HEDLEY_HAS_BUILTIN(__builtin_roundeven)) || \
       HEDLEY_GCC_VERSION_CHECK(10,0,0)
@@ -1288,3 +1288,3 @@
   #if \
-     ((!defined(HEDLEY_EMSCRIPTEN_VERSION) || HEDLEY_EMSCRIPTEN_VERSION_CHECK(3, 1, 43)) && HEDLEY_HAS_BUILTIN(__builtin_roundevenf)) || \
+     (defined(__GLIBC__) && (!defined(HEDLEY_EMSCRIPTEN_VERSION) || HEDLEY_EMSCRIPTEN_VERSION_CHECK(3, 1, 43)) && HEDLEY_HAS_BUILTIN(__builtin_roundevenf)) || \
       HEDLEY_GCC_VERSION_CHECK(10,0,0)