From 2bf04d1f045f27a265ed1b1916e5eef929c13bae Mon Sep 17 00:00:00 2001
From: Thomas Klausner <wiz@gatalith.at>
Date: Sun, 2 Feb 2025 19:07:13 +0100
Subject: [PATCH] build: do not define _POSIX_C_SOURCE on NetBSD

It leads to missing symbols, see #4180.
---
 Makefile | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 0c99eeef..0f5431c7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,7 @@
 ifeq ($(OS),Windows_NT)
 $(error Windows is not supported)
+else
+	detected_OS := $(shell uname -s)
 endif
 
 VERSION := 0.25.1
@@ -27,7 +29,10 @@ OBJ := $(SRC:.c=.o)
 ARFLAGS := rcs
 CFLAGS ?= -O3 -Wall -Wextra -Wshadow -Wpedantic -Werror=incompatible-pointer-types
 override CFLAGS += -std=c11 -fPIC -fvisibility=hidden
-override CFLAGS += -D_POSIX_C_SOURCE=200112L -D_DEFAULT_SOURCE
+ifneq ($(detected_OS),NetBSD)
+override CFLAGS += -D_POSIX_C_SOURCE=200112L
+endif
+override CFLAGS += -D_DEFAULT_SOURCE
 override CFLAGS += -Ilib/src -Ilib/src/wasm -Ilib/include
 
 # ABI versioning