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-rw-r--r--Src/system.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/Src/system.h b/Src/system.h
index 86f035f17..33b0af2f3 100644
--- a/Src/system.h
+++ b/Src/system.h
@@ -37,12 +37,16 @@
 #endif
 #endif
 
+#if defined(__linux) || defined(__GNU__) || defined(__GLIBC__) || defined(LIBC_MUSL)
 /*
  * Turn on numerous extensions.
  * This is in order to get the functions for manipulating /dev/ptmx.
  */
 #define _GNU_SOURCE 1
+#endif
+#ifdef LIBC_MUSL
 #define _POSIX_C_SOURCE 200809L
+#endif
 
 /* NeXT has half-implemented POSIX support *
  * which currently fools configure         */