include version number in OpenSSL-too-old error
diff --git a/configure.ac b/configure.ac
index 67c4486..8b59d91 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2296,7 +2296,7 @@
 		# Check version is supported.
 		case "$ssl_library_ver" in
 			0090[[0-7]]*|009080[[0-5]]*)
-				AC_MSG_ERROR([OpenSSL >= 0.9.8f required])
+				AC_MSG_ERROR([OpenSSL >= 0.9.8f required (have "$ssl_library_ver")])
 		                ;;
 		        *) ;;
 		esac