--- firefox-93.0/modules/fdlibm/src/math_private.h.orig	2021-09-28 00:47:42.000000000 +0200
+++ firefox-93.0/modules/fdlibm/src/math_private.h	2021-10-06 01:23:47.611144150 +0200
@@ -20,6 +20,7 @@
 #include <cfloat>
 #include <stdint.h>
 #include <sys/types.h>
+#include <math.h>
 
 #include "fdlibm.h"
 
@@ -30,8 +31,7 @@
  * Adapted from https://github.com/freebsd/freebsd-src/search?q=__double_t
  */
 
-typedef double      __double_t;
-typedef __double_t  double_t;
+typedef double_t  __double_t;
 
 /*
  * The original fdlibm code used statements like: