'grep -q' is not portable -> don't use it.

documentation/PACKAGING

@@ -448,7 +448,7 @@ You will need to package the files:
 
 The post-install script:
 
-	if ! grep -q /usr/X11R6/lib/wine /etc/ld.so.conf; then
+	if ! grep /usr/X11R6/lib/wine /etc/ld.so.conf >/dev/null; then
 	    echo "/usr/X11R6/lib/wine" >> /etc/ld.so.conf
 	fi
 	/sbin/ldconfig

tools/wineinstall

@@ -274,7 +274,7 @@ then {
       # to our sucommand string
       if [ -f /etc/ld.so.conf ]
       then
-        if ! grep -qs "$libdir" /etc/ld.so.conf
+        if ! grep -s "$libdir" /etc/ld.so.conf >/dev/null 2>&1
         then {
           echo
           echo "$libdir doesn't exist in your /etc/ld.so.conf, it will be added"