diff -ur pine/osdep/makefile.bas
--- pine/osdep/makefile.bas	Mon Nov  3 13:11:17 1997
+++ pine/osdep/makefile.bas	Sat Aug  1 22:01:37 1998
@@ -4,7 +4,7 @@
 RM=  rm -f
 
 ALL=	os-a32.c os-a41.c os-aix.c os-asv.c \
-	os-aux.c os-bs2.c os-bsd.c os-bsf.c os-bsi.c \
+	os-aux.c os-bs2.c os-bsd.c os-bsf.c os-bsi.c os-bso.c \
 	os-cvx.c os-dos.c os-dpx.c os-dyn.c \
 	os-gen.c os-hpp.c os-isc.c os-lnx.c \
 	os-lyn.c os-mnt.c os-neb.c os-nxt.c \
