--- a/configure.in	2003-11-03 09:19:11.000000000 +0100
+++ b/configure.in	2008-07-27 21:59:45.774740303 +0200
@@ -2,6 +2,12 @@
 AC_INIT(main.c)
 AC_CONFIG_HEADER(config.h)
 
+# test prior to AC_PROG_CC, since it sets cflags on it's own.
+if test x"CFLAGS" = x
+then
+	DEFAULT_CFLAGS="-g -Wall -O3"
+fi
+
 dnl Checks for programs.
 AC_PROG_CC
 AC_PROG_INSTALL
@@ -9,10 +15,10 @@
 AC_SYS_LARGEFILE
 
 # Thanks to Martin Pool
-if test x"$GCC" = xyes 
+if test x"$GCC" = xyes && test x"$DEFAULT_CFLAGS" != x
 then
     CFLAGS="-g -Wall -O3"
-    AC_MSG_NOTICE([Setting gcc options: $CFLAGS])
+    AC_MSG_RESULT([Setting default cflags: $CFLAGS])
 fi
 
 AC_CHECK_HEADERS(fcntl.h sys/time.h sys/unistd.h unistd.h)
@@ -45,12 +51,8 @@
 AC_CHECK_LIB(bz2, BZ2_bzBuffToBuffCompress, , 
         AC_MSG_ERROR([Could not find bz2 library - please install libbz2-devel]))
 
-echo $ac_n "checking for errno in errno.h... $ac_c"
-AC_TRY_COMPILE([#include <errno.h>],[int i = errno],
-echo yes; AC_DEFINE(HAVE_ERRNO_DECL),
-echo no)
-
 AC_CHECK_FUNCS(mmap strerror)
 AC_CHECK_FUNCS(getopt_long)
+AC_CHECK_FUNCS(strndup)
 
 AC_OUTPUT(Makefile)
--- a/main.c	2006-02-14 01:38:23.000000000 +0100
+++ b/main.c	2008-07-27 22:00:28.298071207 +0200
@@ -18,6 +18,7 @@
 /* rzip compression - main program */
 
 #include "rzip.h"
+#include "strutils.h"
 
 static void usage(void)
 {
--- a/rzip.h	2006-02-14 01:38:23.000000000 +0100
+++ b/rzip.h	2008-07-27 21:58:08.204752617 +0200
@@ -94,7 +94,7 @@
 #define strerror(i) sys_errlist[i]
 #endif
 
-#ifndef HAVE_ERRNO_DECL
+#if !defined(errno)
 extern int errno;
 #endif
 
--- a/strutils.c	1970-01-01 01:00:00.000000000 +0100
+++ b/strutils.c	2008-07-27 21:58:08.204752617 +0200
@@ -0,0 +1,29 @@
+/* 
+   Copyright (C) 2005 Gentoo Foundation
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+/* string utilities that may be missing on various platforms */
+
+#include "strutils.h"
+
+#ifndef HAVE_STRNDUP
+char* strndup(const char* s, size_t n) {
+	char* ret = malloc(n + 1);
+	if (ret == NULL) return(ret);
+	ret[n] = '\0';
+	return(memcpy(ret, s, n));
+}
+#endif
--- a/strutils.h	1970-01-01 01:00:00.000000000 +0100
+++ b/strutils.h	2008-07-27 21:58:08.204752617 +0200
@@ -0,0 +1,31 @@
+/* 
+   Copyright (C) 2005 Gentoo Foundation
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+/* string utilities that may be missing on various platforms */
+
+#ifndef _HEADER_STRUTIL
+#define _HEADER_STRUTIL 1
+
+#include <stdlib.h>
+#include <string.h>
+#include "config.h"
+
+# ifndef HAVE_STRNDUP
+char* strndup(const char* s, size_t n);
+# endif
+
+#endif
--- a/Makefile.in	2006-02-14 01:38:23.000000000 +0100
+++ b/Makefile.in	2010-08-26 23:34:38.000000000 +0200
@@ -3,8 +3,8 @@
 
 prefix=@prefix@
 exec_prefix=@exec_prefix@
-INSTALL_BIN=$(exec_prefix)/bin
-INSTALL_MAN=$(prefix)/man
+INSTALL_BIN=$(DESTDIR)/@bindir@
+INSTALL_MAN=$(DESTDIR)/@mandir@
 
 LIBS=@LIBS@
 CC=@CC@
@@ -20,7 +20,7 @@
 .SUFFIXES:
 .SUFFIXES: .c .o
 
-OBJS= rzip.o runzip.o main.o stream.o util.o crc32.o
+OBJS= rzip.o runzip.o strutils.o main.o stream.o util.o crc32.o
 
 # note that the -I. is needed to handle config.h when using VPATH
 .c.o:
@@ -35,9 +35,10 @@
 	${INSTALLCMD} -m 755 rzip ${INSTALL_BIN}
 	-mkdir -p ${INSTALL_MAN}/man1
 	${INSTALLCMD} -m 644 $(srcdir)/rzip.1 ${INSTALL_MAN}/man1/
+	ln -s rzip $(INSTALL_BIN)/runzip
 
 rzip: $(OBJS)
-	$(CC) $(CFLAGS) -o rzip $(OBJS) $(LIBS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o rzip $(OBJS) $(LIBS)
 
 rzip.1: rzip.yo
 	yodl2man -o rzip.1 rzip.yo