--- Makefile.orig	2002-06-11 05:12:06.000000000 +0800
+++ Makefile	2013-07-19 22:55:35.000000000 +0800
@@ -19,8 +19,7 @@
 	  echo 'source=$$1; shift'; \
 	  echo 'base=`echo "$$source" | sed -e s:\\\\.c$$::`'; \
 	  echo exec `head -1 conf-cc` '-I. -o $${base}.o -c $$source $${1+"$$@"}'; \
-	) >compile
-	chmod 755 compile
+	) >compile && chmod 755 compile
 
 conf_bin.c: conf-bin
 	head -1 conf-bin | \
@@ -38,37 +37,31 @@
 	./compile env.c
 
 installer: load insthier.o
-	./load insthier -linstaller
-	mv insthier installer
+	./load insthier -linstaller && mv insthier installer
 
 instcheck: load insthier.o
-	./load insthier -linstcheck
-	mv insthier instcheck
+	./load insthier -linstcheck && mv insthier instcheck
 
 insthier.o: compile insthier.c conf_bin.c conf_man.c
 	./compile insthier.c
 
 instshow: load insthier.o
-	./load insthier -linstshow
-	mv insthier instshow
+	./load insthier -linstshow && mv insthier instshow
 
 load: conf-ld
 	( echo '#!/bin/sh';\
 	  echo 'main="$$1"; shift';\
 	  echo exec `head -1 conf-ld` '-o "$$main" "$$main.o" $${1+"$$@"}' -lsysdeps;\
-	) >load
-	chmod 755 load
+	) >load && chmod 755 load
 
 programs: unixclient unixserver unixcat
 
 socket.lib: compile load trylib.c
 	( ( ./compile trylib.c && ./load trylib -lsocket -lnsl ) >/dev/null 2>&1 \
-	  && echo -lsocket -lnsl || exit 0 ) >socket.lib
-	rm -f trylib.o trylib
+	  && echo -lsocket -lnsl || exit 0 ) >socket.lib && rm -f trylib.o trylib
 
 unixcat: warn-auto.sh unixcat.sh
-	cat warn-auto.sh unixcat.sh >unixcat
-	chmod 755 unixcat
+	cat warn-auto.sh unixcat.sh >unixcat && chmod 755 unixcat
 
 unixclient: load unixclient.o env.o utoa.o socket.lib
 	./load unixclient env.o utoa.o `cat socket.lib`