diff --git a/xtrn/sbj/GNUmakefile b/xtrn/sbj/GNUmakefile
index 31bc0c6a9345fafc03855a1eb264a739afa2aa08..ff6afae71f2fe11921e62f5f415925859438a44f 100644
--- a/xtrn/sbj/GNUmakefile
+++ b/xtrn/sbj/GNUmakefile
@@ -20,7 +20,7 @@ include $(XPDEV)Common.gmake
 CFLAGS	+=	-I$(XSDK)
 
 ifeq ($(os),sunos)
- LDFLAGS	+=	-lsocket -lnsl
+ LDFLAGS	+=	-lsocket -lnsl -lrt
 endif
 
 $(EXEODIR)$(SLASH)sbj: $(LIBODIR)$(SLASH)sbj.o $(OBJS)
diff --git a/xtrn/sbl/GNUmakefile b/xtrn/sbl/GNUmakefile
index 18f51bbac9d227ad2d1240e319fd4b8b18401b65..ea0b268248130fb047613c76cfeb84e08cf49fee 100644
--- a/xtrn/sbl/GNUmakefile
+++ b/xtrn/sbl/GNUmakefile
@@ -23,7 +23,7 @@ include $(XPDEV)Common.gmake
 include $(SBBS_SRC)Common.gmake
 
 ifeq ($(os),sunos)
- LDFLAGS	+=	-lsocket -lnsl
+ LDFLAGS	+=	-lsocket -lnsl -lrt
 endif
 
 vpath %.c $(XSDK)