diff --git a/Changes b/Changes
index 565b3d1..811dc64 100644
--- a/Changes
+++ b/Changes
@@ -1,7 +1,9 @@
 Revision history for Perl extension Net::mbedTLS:
 
 0.02
-- Added changelog
+- Fixed IO::Async module not to require AnyEvent.
+- Fixed compatiblity with older perls (“current_sub” is no longer used).
+- Added changelog.
 
 0.01 Wed Dec 21 2022
 - Initial release
diff --git a/Makefile.PL b/Makefile.PL
index bb0af43..bfd97d7 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -111,6 +111,19 @@ sub _determine_defines {
     my @defines;
 
     my @checks = (
+
+        # A hack to detect nonavailability of mbedTLS:
+        {
+            label => 'mbedTLS availability',
+            required => 1,
+            c => q[
+                #include <mbedtls/pk.h>
+                int main() {
+                    return 0;
+                }
+            ],
+        },
+
         {
             label => 'public net_socket.fd',
             define => 'NET_CONTEXT_FD_IS_PUBLIC',
@@ -222,6 +235,11 @@ sub _determine_defines {
             );
         };
 
+        if ($check_hr->{'required'}) {
+            die "DEPENDENCY FAILED\n" if !$obj_file;
+            next;
+        }
+
         if ($obj_file) {
             push @defines, $check_hr->{'define'};
         }
diff --git a/cpanfile b/cpanfile
index d62f407..515800a 100644
--- a/cpanfile
+++ b/cpanfile
@@ -4,7 +4,6 @@ configure_requires 'autodie';
 configure_requires 'ExtUtils::CBuilder';
 configure_requires 'ExtUtils::MakeMaker::CPANfile';
 
-test_requires 'Test::DescribeMe';
 test_requires 'Test::FailWarnings';
 test_requires 'Mozilla::CA';
 
diff --git a/lib/Net/mbedTLS.pm b/lib/Net/mbedTLS.pm
index d39637c..30deda9 100644
--- a/lib/Net/mbedTLS.pm
+++ b/lib/Net/mbedTLS.pm
@@ -8,7 +8,7 @@ our $VERSION;
 use XSLoader ();
 
 BEGIN {
-    $VERSION = '0.01';
+    $VERSION = '0.01_90';
     XSLoader::load( __PACKAGE__, $VERSION );
 }