https://github.com/hackeron/live555/blob/master/genMakefiles
It should be more like:
os=$1
modules="liveMedia groupsock ..."
for module in $modules
do
/bin/rm -f $module/Makefile
cat $module/Makefile.head config.$os $module/Makefile.tail > $module/Makefile
chmod a-w $module/Makefile
done