--- gettext-0.22.4/gettext-tools/gnulib-lib/math.in.h.bak	2023-11-17 22:34:11.000000000 +0100
+++ gettext-0.22.4/gettext-tools/gnulib-lib/math.in.h	2024-02-13 14:20:15.453314684 +0100
@@ -2668,7 +2668,7 @@
 _GL_MATH_CXX_REAL_FLOATING_DECL_2 (isnan, rpl_isnan, bool)
 #    define isnan rpl_isnan
 #    define GNULIB_NAMESPACE_LACKS_ISNAN 1
-#   elif (defined __FreeBSD__ && __clang_major__ >= 14)
+#   elif (((defined __APPLE__ && defined __MACH__) || defined __FreeBSD__) && __clang_major__ >= 14)
   /* Neither of the two possible _GL_MATH_CXX_REAL_FLOATING_DECL_2 invocations
      works.  Inline functions are already present in /usr/include/c++/v1/math.h,
      which comes from LLVM.  */