QNX 4 support.
diff --git a/e_os.h b/e_os.h
index 487f0b2..3af6efb 100644
--- a/e_os.h
+++ b/e_os.h
@@ -363,6 +363,10 @@
 #      include <sys/select.h>
 #    endif
 
+#    ifdef __QNX__
+#      include <sys/select.h>
+#    endif
+
 #    if defined(sun)
 #      include <sys/filio.h>
 #    else