The first change makes sure $D/ESTDIR isn't created.

The original build system assumes that in DESTDIR, a mandir (say,
/usr/share/man) already exists. Using -p may not be compatible, but then again
this is a Gentoo specific patch. -JeR

--- Makefile.in.orig	2008-08-25 05:29:02.000000000 +0200
+++ Makefile.in	2008-08-25 05:30:41.000000000 +0200
@@ -43,8 +43,8 @@
 	@( cd ./ncftp ; $(MAKE) "CC=$(CC)" "CFLAGS=$(CFLAGS)" )
 	@( cd ./sh_util ; $(MAKE) "CC=$(CC)" "CFLAGS=$(CFLAGS)" )
 	@( cd ./vis ; $(MAKE) "CC=$(CC)" "CFLAGS=$(CFLAGS)" )
-	-@test -z "$(DESTDIR)" || mkdir -p "$DESTDIR" 2>/dev/null
-	-mkdir "$(DESTDIR)$(prefix)" "$(DESTDIR)$(BINDIR)" "$(DESTDIR)$(SYSCONFDIR)" "$(DESTDIR)$(mandir)" "$(DESTDIR)$(mandir)/man1" 2>/dev/null
+	-@test -z "$(DESTDIR)" || mkdir -p "$(DESTDIR)" 2>/dev/null
+	-mkdir -p "$(DESTDIR)$(prefix)" "$(DESTDIR)$(BINDIR)" "$(DESTDIR)$(SYSCONFDIR)" "$(DESTDIR)$(mandir)/man1" 2>/dev/null
 	-@echo '..... Installing the programs .....'
 	$(INSTALL_PROGRAM) bin/ncftp@EXEEXT@ "$(DESTDIR)$(BINDIR)/ncftp@EXEEXT@"
 	$(INSTALL_PROGRAM) bin/ncftpget@EXEEXT@ "$(DESTDIR)$(BINDIR)/ncftpget@EXEEXT@"
@@ -52,7 +52,7 @@
 	$(INSTALL_PROGRAM) bin/ncftpls@EXEEXT@ "$(DESTDIR)$(BINDIR)/ncftpls@EXEEXT@"
 	$(INSTALL_PROGRAM) bin/ncftpbatch@EXEEXT@ "$(DESTDIR)$(BINDIR)/ncftpbatch@EXEEXT@"
 	-@test -f "$(DESTDIR)$(BINDIR)/ncftpspooler@EXEEXT@" && echo /bin/rm "$(DESTDIR)$(BINDIR)/ncftpspooler@EXEEXT@" && /bin/rm "$(DESTDIR)$(BINDIR)/ncftpspooler@EXEEXT@"
-	ln "$(DESTDIR)$(BINDIR)/ncftpbatch@EXEEXT@" "$(DESTDIR)$(BINDIR)/ncftpspooler@EXEEXT@"
+	ln -s "ncftpbatch@EXEEXT@" "$(DESTDIR)$(BINDIR)/ncftpspooler@EXEEXT@"
 #
 # The visual programs are only built if a working Curses was found.
 #