https://git.ruby-lang.org/ruby.git/commit/?id=e41b121e94

From e41b121e94ccce9877824e55f865885bbabe40c3 Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@g...>
Date: Sun, 16 Jan 2022 02:34:43 +0900
Subject: [wasm] configure.ac: setup platform specific libraries

These flags are very wasi-libc version specific, so updating wasi-libc
may break the build. But supporting multiple wasi-libc versions in ruby
doesn't have much benefit because wasi-libc is not installed in most
systems.
---
 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure.ac b/configure.ac
index 840fa110a37..f0f3bab5704 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1215,6 +1215,10 @@ main() https://github.com/ruby/ruby/blob/trunk/configure.ac#L1215
 		RUBY_APPEND_OPTIONS(LDFLAGS, "-sFORCE_FILESYSTEM=1")
 		ac_cv_func_shutdown=no
 		],
+[wasi*],[	LIBS="-lm -lwasi-emulated-mman -lwasi-emulated-signal -lwasi-emulated-getpid -lwasi-emulated-process-clocks $LIBS"
+		RUBY_APPEND_OPTIONS(CFLAGS, -D_WASI_EMULATED_SIGNAL -D_WASI_EMULATED_MMAN -D_WASI_EMULATED_GETPID -D_WASI_EMULATED_PROCESS_CLOCKS)
+		RUBY_APPEND_OPTIONS(CPPFLAGS, -D_WASI_EMULATED_SIGNAL -D_WASI_EMULATED_MMAN -D_WASI_EMULATED_GETPID -D_WASI_EMULATED_PROCESS_CLOCKS)
+		]
 [	LIBS="-lm $LIBS"])
 : ${ORIG_LIBS=$LIBS}
 
-- 
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