diff -ur mpfr-4.2.2/src/mparam_h.in mpfr-src/src/mparam_h.in
--- mpfr-4.2.2/src/mparam_h.in	Thu Jan 02 10:30:02 2025
+++ mpfr-src/src/mparam_h.in	Fri Mar 21 10:08:29 2025
@@ -37,6 +37,8 @@
    -march=... and -mtune=...).
    See https://gcc.gnu.org/pipermail/gcc-help/2021-September/140720.html */
 
+#elif 1 /* no processor specific optimization for TeX Live */
+#define MPFR_TUNE_CASE "default"
 #elif (defined (__tune_core2__) || defined (__tune_nocona__)) && defined (__x86_64) /* 64-bit Core 2 or Xeon */
 #define MPFR_TUNE_CASE "src/x86_64/core2/mparam.h"
 #include "x86_64/core2/mparam.h"
