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-rw-r--r--includes/Stg.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/includes/Stg.h b/includes/Stg.h
index 022b385e2d..392fd2a0ab 100644
--- a/includes/Stg.h
+++ b/includes/Stg.h
@@ -31,9 +31,13 @@
*/
#ifndef IN_STG_CODE
# define IN_STG_CODE 1
-# define _ISOC99_SOURCE
+
// Turn on C99 for .hc code. This gives us the INFINITY and NAN
// constants from math.h, which we occasionally need to use in .hc (#1861)
+# define _ISOC99_SOURCE
+
+// Turning on _ISOC99_SOURCE means S_ISSOCK gets defined on Linux
+# define _BSD_SOURCE
#endif
#if IN_STG_CODE == 0