install.sh now detects present GCC branch tar ball

Author: Damian Rouson

prerequisites/build-functions/download_if_necessary.sh

@@ -68,8 +68,8 @@ download_if_necessary()
       ;;
    esac
 
-  if  [[ -f "${download_path}/${url_tail}" || -d "${download_path}/${url_tail}" ]] ; then
-    info "Found '${url_tail}' in ${download_path}."
+  if  [[ -f "${download_path}/${url_tail}" || -d "${download_path}/${url_tail##*branches/}" ]]; then
+    info "Found '${url_tail##*branches/}' in ${download_path}."
     info "If it resulted from an incomplete download, building ${package_name} could fail."
     if [[ "${arg_y}" == "${__flag_present}" ]]; then
       info "-y or --yes-to-all flag present. Proceeding with non-interactive build."
@@ -78,7 +78,7 @@ download_if_necessary()
       read -r proceed
       if [[ "${proceed}" == "n" || "${proceed}" == "N" || "${proceed}" == "no"  ]]; then
         info "n"
-        info "Please remove $url_tail and restart the installation to to ensure a fresh download." 1>&2
+        info "Please remove ${url_tail##*branches/} and restart the installation to to ensure a fresh download." 1>&2
         emergency "Aborting. [exit 80]"
       else
         info "y"