https://bugs.gentoo.org/709670

--- a/lib/Alien/Gnuplot.pm
+++ b/lib/Alien/Gnuplot.pm
@@ -289,7 +289,7 @@
 your GNUPLOT_BINARY variable to an actual gnuplot.
 };
     
-    $lines =~ m/Version (\d+\.\d+) (patchlevel (\d+))?/ or die qq{
+    $lines =~ m/Version (\d+\.\d+(?:\.\d+)?) (patchlevel (\d+))?/ or die qq{
 Alien::Gnuplot: the executable file $exec_path claims to be gnuplot, but 
 I could not parse a version number from its output.  Sorry, I give up.