From 3834b8e219d0b4d96ec2bc02b3563a264a9b11b4 Mon Sep 17 00:00:00 2001
From: Mike Taylor <mike@indexdata.com>
Date: Tue, 27 Feb 2007 18:16:26 +0000
Subject: [PATCH] Check for at least YAZ version 2.1.51

---
 Makefile.PL |   49 +++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 43 insertions(+), 6 deletions(-)

diff --git a/Makefile.PL b/Makefile.PL
index 1b9a995..9db1592 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -1,20 +1,57 @@
-# $Id: Makefile.PL,v 1.11 2007-02-26 14:47:35 mike Exp $
+# $Id: Makefile.PL,v 1.12 2007-02-27 18:16:26 mike Exp $
 
 use 5.008;
+use strict;
+use warnings;
 use ExtUtils::MakeMaker;
+
+my $yazver = `yaz-config --version`;
+if (!$yazver) {
+    die qq[
+ERROR: Unable to call script: yaz-config
+If you are using a YAZ installation from the Debian package "yaz", you
+will also need to install "libyaz-dev" in order to build this module.
+];
+}
+
+chomp($yazver);
+# 2.1.51 is the first version with support for polling arbitrarily
+# many file descriptors: earlier YAZ versions had a hardwired
+# 1024-element array so that working with more file descriptors than
+# this would cause a segmentation fault.
+check_version($yazver, "2.1.51");
+
 # See lib/ExtUtils/MakeMaker.pm for details of how to influence
 # the contents of the Makefile that is written.
 WriteMakefile(
     NAME              => 'ZOOM::IRSpy',
     VERSION_FROM      => 'lib/ZOOM/IRSpy.pm', # finds $VERSION
     PREREQ_PM         => {
-	Net::Z3950::ZOOM => 1.18,
-	XML::LibXML::XPathContext => 0.07, # For Web UI
-        XML::LibXML => 1.58,
-        XML::LibXSLT => 1.57,
-	URI::Escape => 3.28, # For Web UI
+	"Net::Z3950::ZOOM" => 1.18,
+	"XML::LibXML::XPathContext" => 0.07, # For Web UI
+        "XML::LibXML" => 1.58,
+        "XML::LibXSLT" => 1.57,
+	"URI::Escape" => 3.28, # For Web UI
     },
     ($] >= 5.005 ?     ## Add these new keywords supported since 5.005
       (ABSTRACT_FROM  => 'lib/ZOOM/IRSpy.pm', # retrieve abstract from module
        AUTHOR         => 'Mike Taylor <mike@indexdata.com>') : ()),
 );
+
+
+sub check_version {
+    my($got, $want) = @_;
+
+    my($gmajor, $gminor, $gtrivial) = ($got =~ /(\d+)\.(\d+)\.(\d+)/);
+    my($wmajor, $wminor, $wtrivial) = ($want =~ /(\d+)\.(\d+)\.(\d+)/);
+    if (($gmajor < $wmajor) ||
+	($gmajor == $wmajor && $gminor < $wminor) ||
+	($gmajor == $wmajor && $gminor == $wminor && $gtrivial < $wtrivial)) {
+	print <<__EOT__;
+*** ERROR!
+ZOOM-Perl requires at least version $want of YAZ,
+but is currently you only have version $got.
+__EOT__
+	exit 1;
+    }
+}
-- 
1.7.10.4