--- /dev/null
+BEGIN {
+ if ($ENV{PERL_CORE}) {
+ chdir 't' if -d 't';
+ @INC = ("../lib", "lib/compress");
+ }
+}
+
+use lib qw(t t/compress);
+use strict ;
+use warnings ;
+
+use Test::More ;
+
+BEGIN
+{
+ # use Test::NoWarnings, if available
+ my $extra = 0 ;
+ $extra = 1
+ if eval { require Test::NoWarnings ; import Test::NoWarnings; 1 };
+
+ plan tests => 2 + $extra ;
+
+ use_ok('Compress::Raw::Zlib', 2) ;
+}
+
+# Check zlib_version and ZLIB_VERSION are the same.
+
+my $zlib_h = ZLIB_VERSION ;
+my $libz = Compress::Raw::Zlib::zlib_version;
+
+is($zlib_h, $libz, "ZLIB_VERSION ($zlib_h) matches Compress::Raw::Zlib::zlib_version")
+ or diag <<EOM;
+
+The version of zlib.h does not match the version of libz
+
+You have zlib.h version $zlib_h
+ and libz version $libz
+
+You probably have two versions of zlib installed on your system.
+Try removing the one you don't want to use and rebuild.
+EOM
+