From ea0737ecfd2576693e078c0c7c614671afb0e2b0 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 6 Feb 2021 00:39:53 +0900
Subject: Define `M_E` for some platforms.

---
 mrbgems/mruby-cmath/src/cmath.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'mrbgems/mruby-cmath/src')

diff --git a/mrbgems/mruby-cmath/src/cmath.c b/mrbgems/mruby-cmath/src/cmath.c
index 9eeadd019..19da2eae2 100644
--- a/mrbgems/mruby-cmath/src/cmath.c
+++ b/mrbgems/mruby-cmath/src/cmath.c
@@ -116,6 +116,11 @@ cmath_log(mrb_state *mrb, mrb_value self) {
   mrb_float real, imag;
 
   mrb_int n = mrb_get_args(mrb, "o|f", &z, &base);
+
+#ifndef M_E
+#define M_E F(exp)(1.0)
+#endif
+
   if (n == 1) base = M_E;
   if (cmath_get_complex(mrb, z, &real, &imag) || real < 0.0) {
     mrb_complex c = CX(real,imag);
-- 
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