+
+vcheck (){
+ perl <<PERL
+@t = split /\./, "$1";
+@v = split /\./, (split /\s+/, \`$2\`)[3];
+print "$2 = ", (join ".",@v), " (expected $1)\n";
+exit \$t[0]*1000000+\$t[1]*1000+\$t[2] > \$v[0]*1000000+\$v[1]*1000+\$v[2];
+PERL
+}
+
+
+if vcheck 1.4.2 "libtool --version"
+then
+ echo "get a copy of GNU libtool >= 1.4.2"
+ exit 1
+fi
+
+if vcheck 1.5 "automake --version"
+then
+ echo "get a copy of GNU automake >= 1.5"
+ exit 1
+fi
+
+if vcheck 2.52 "autoconf --version"
+then
+ echo "get a copy of GNU autoconf >= 2.52"
+ exit 1
+fi
+