[gtk-doc] configure: Lower perl dependency to 5.16.0

[Stefan Kost <stefkost src gnome org>]

commit 567353f33c01db9979ba76c772f7b11dbd3ec15f
Author: Kalev Lember <klember redhat com>
Date:   Tue Oct 18 13:07:24 2016 +0200

    configure: Lower perl dependency to 5.16.0
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773151

 configure.ac |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index ee4d651..cdca7d3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,12 +39,12 @@ if test -z "$PERL"; then
        AC_MSG_ERROR([perl not found])
 fi
 
-AC_MSG_CHECKING([if Perl version >= 5.18.0])
-if "$PERL" -e "require v5.18.0"; then
+AC_MSG_CHECKING([if Perl version >= 5.16.0])
+if "$PERL" -e "require v5.16.0"; then
        AC_MSG_RESULT([yes])
 else
        AC_MSG_RESULT([no])
-       AC_MSG_ERROR([perl >= 5.18.0 is required for gtk-doc])
+       AC_MSG_ERROR([perl >= 5.16.0 is required for gtk-doc])
 fi
 
 dnl