1 files changed, 4 insertions, 0 deletions
diff --git a/h/sysdep.h b/h/sysdep.h
index f6943ba..368ba5a 100644
--- a/h/sysdep.h
+++ b/h/sysdep.h
@@ -21,6 +21,7 @@
 #include <signal.h>
 #include <syslog.h>
 #ifdef HAVE_UNISTD_H
+#ifndef __USE_XOPEN_EXTENDED
 #ifdef HAVE_GETSID
 #define __USE_XOPEN_EXTENDED
 #endif
@@ -28,6 +29,9 @@
 #ifdef __USE_XOPEN_EXTENDED
 #undef __USE_XOPEN_EXTENDED
 #endif
+#else
+#include <unistd.h>
+#endif
 #endif
 #include <sys/types.h>
 #include <sys/stat.h>