--- a/config/install-sh
+++ b/config/install-sh
@@ -56,7 +56,7 @@
 
 while [ x"$1" != x ]; do
     case $1 in
-	-c) instcmd="$cpprog"
+	-c) instcmd=$cpprog
 	    shift
 	    continue;;
 
@@ -79,7 +79,7 @@
 	    shift
 	    continue;;
 
-	-s) stripcmd="$stripprog"
+	-s) stripcmd=$stripprog
 	    shift
 	    continue;;
 
@@ -106,7 +106,7 @@
 
 if [ x"$src" = x ]
 then
-	echo "install-sh: no input file specified" >&2
+	echo "$0: no input file specified" >&2
 	exit 1
 else
 	:
@@ -115,7 +115,7 @@
 if [ x"$dir_arg" != x ]; then
 	dst=$src
 	src=""
-	
+
 	if [ -d "$dst" ]; then
 		instcmd=:
 		chmodcmd=""
@@ -125,20 +125,20 @@
 else
 
 # Waiting for this to be detected by the "$instcmd $src $dsttmp" command
-# might cause directories to be created, which would be especially bad 
+# might cause directories to be created, which would be especially bad
 # if $src (and thus $dsttmp) contains '*'.
 
 	if [ -f "$src" ] || [ -d "$src" ]
 	then
 		:
 	else
-		echo "install-sh: $src does not exist" >&2
+		echo "$0: $src does not exist" >&2
 		exit 1
 	fi
-	
+
 	if [ x"$dst" = x ]
 	then
-		echo "install-sh: no destination specified" >&2
+		echo "$0: no destination specified" >&2
 		exit 1
 	else
 		:
@@ -149,7 +149,7 @@
 
 	if [ -d "$dst" ]
 	then
-		dst="$dst"/`basename "$src"`
+		dst=$dst/`basename "$src"`
 	else
 		:
 	fi
@@ -165,34 +165,34 @@
 if [ ! -d "$dstdir" ]; then
 defaultIFS='
 	'
-IFS="${IFS-${defaultIFS}}"
+IFS="${IFS-$defaultIFS}"
 
-oIFS="${IFS}"
+oIFS=$IFS
 # Some sh's can't handle IFS=/ for some reason.
 IFS='%'
-set - `echo ${dstdir} | sed -e 's@/@%@g' -e 's@^%@/@'`
-IFS="${oIFS}"
+set - `echo "$dstdir" | sed -e 's@/@%@g' -e 's@^%@/@'`
+IFS=$oIFS
 
 pathcomp=''
 
 while [ $# -ne 0 ] ; do
-	pathcomp="${pathcomp}${1}"
+	pathcomp=$pathcomp$1
 	shift
 
-	if [ ! -d "${pathcomp}" ] ;
+	if [ ! -d "$pathcomp" ] ;
         then
-		$mkdirprog "${pathcomp}"
+		$mkdirprog "$pathcomp"
 	else
 		:
 	fi
 
-	pathcomp="${pathcomp}/"
+	pathcomp=$pathcomp/
 done
 fi
 
 if [ x"$dir_arg" != x ]
 then
-	$doit $instcmd $dst &&
+	$doit $instcmd "$dst" &&
 
 	if [ x"$chowncmd" != x ]; then $doit $chowncmd "$dst"; else : ; fi &&
 	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd "$dst"; else : ; fi &&
@@ -202,24 +202,24 @@
 
 # If we're going to rename the final executable, determine the name now.
 
-	if [ x"$transformarg" = x ] 
+	if [ x"$transformarg" = x ]
 	then
 		dstfile=`basename "$dst"`
 	else
-		dstfile=`basename "$dst" $transformbasename | 
+		dstfile=`basename "$dst" $transformbasename |
 			sed $transformarg`$transformbasename
 	fi
 
 # don't allow the sed command to completely eliminate the filename
 
-	if [ x"$dstfile" = x ] 
+	if [ x"$dstfile" = x ]
 	then
 		dstfile=`basename "$dst"`
 	else
 		:
 	fi
 
-# Make a temp file name in the proper directory.
+# Make a couple of temp file names in the proper directory.
 
 	dsttmp=$dstdir/#inst.$$#
 	rmtmp=$dstdir/#rm.$$#
@@ -244,7 +244,7 @@
 	if [ x"$stripcmd" != x ]; then $doit $stripcmd "$dsttmp"; else :;fi &&
 	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd "$dsttmp"; else :;fi &&
 
-# Now remove or move any old file at destination location.  We try this
+# Now remove or move aside any old file at destination location.  We try this
 # two ways since rm can't unlink itself on some systems and the destination
 # file might be busy for other reasons.  In this case, the final cleanup
 # might fail but the new file should still install successfully.
@@ -255,21 +255,20 @@
 		$doit $rmcmd -f "$dstdir/$dstfile" 2>/dev/null ||
 		$doit $mvcmd -f "$dstdir/$dstfile" "$rmtmp" 2>/dev/null ||
 		{
-		  echo "install-sh: cannot unlink or rename $dstdir/$dstfile" >&2
+		  echo "$0: cannot unlink or rename $dstdir/$dstfile" >&2
 		  (exit 1); exit
 		}
 	else
-		true
+		:
 	fi
 } &&
 
 # Now rename the file to the real destination.
 
-	$doit $mvcmd $dsttmp $dstdir/$dstfile 
+	$doit $mvcmd "$dsttmp" "$dstdir/$dstfile"
 
 fi &&
 
-
 # The final little trick to "correctly" pass the exit status to the exit trap.
 
 {