+find the sources for these in the respective upstream directories:
+
+ ftp://ftp.gnu.org/gnu/autoconf
+ ftp://ftp.gnu.org/gnu/automake
+ ftp://ftp.gnu.org/gnu/libtool
+ ftp://ftp.gnu.org/gnu/gettext
+
+The required versions of the tools for this tree are
+ autoconf 2.69
+ automake 1.15.1
+ libtool 2.2.6
+ gettext 0.14.5