Only define _POSIX_C_SOURCE if it is not defined

grassator · Dec 28, 2021 · aec2afa · aec2afa
1 parent 3f29eee
commit aec2afa
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/bdd-for-c.h b/bdd-for-c.h
@@ -31,8 +31,10 @@ SOFTWARE.
   #include <io.h>
   #define __BDD_IS_ATTY__() _isatty(_fileno(stdout))
 #else
-  // This definition is required for `fileno` to be defined
-  #define _POSIX_C_SOURCE 1
+  #ifndef _POSIX_C_SOURCE
+    // This definition is required for `fileno` to be defined
+    #define _POSIX_C_SOURCE 200809
+  #endif
   #include <stdio.h>
   #include <unistd.h>
   #include <term.h>