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https://bugs.gentoo.org/898866
From: Brahmajit Das <brahmajit.xyz@gmail.com>
Date: Sat, 17 Jun 2023 15:32:10 +0000
Subject: [PATCH 1/1] Fix building against musl C library
PTHREAD_RWLOCK_PREFER_WRITER_NP isn't available in musl libc/non-glibc
systems. Additional check of __GLIBC__ being defined is needed.
Signed-off-by: Brahmajit Das <brahmajit.xyz@gmail.com>
--- a/lib/FXReadWriteLock.cpp
+++ b/lib/FXReadWriteLock.cpp
@@ -62,7 +62,7 @@ FXReadWriteLock::FXReadWriteLock(){
InitializeCriticalSection(((RWLOCK*)data)->mutex);
InitializeCriticalSection(((RWLOCK*)data)->access);
((RWLOCK*)data)->readers=0;
-#elif (_XOPEN_SOURCE >= 500) || (_POSIX_C_SOURCE >= 200809L)
+#elif (_XOPEN_SOURCE >= 500) || (_POSIX_C_SOURCE >= 200809L) && defined(__GLIBC__)
// If this fails on your machine, determine what value
// of sizeof(pthread_rwlock_t) is supposed to be on your
// machine and mail it to: jeroen@fox-toolkit.net!!
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