--- CMakeLists.txt.orig	2021-02-24 15:08:43 UTC
+++ CMakeLists.txt
@@ -490,7 +490,7 @@ macro (CMAKE_BUILD_UTILITIES)
     endif()
     set(_CMAKE_USE_OPENSSL_DEFAULT OFF)
     if(NOT DEFINED CMAKE_USE_OPENSSL AND NOT WIN32 AND NOT APPLE
-        AND CMAKE_SYSTEM_NAME MATCHES "(Linux|FreeBSD)")
+        AND CMAKE_SYSTEM_NAME MATCHES "(Linux|FreeBSD|BSDSUniX)")
       set(_CMAKE_USE_OPENSSL_DEFAULT ON)
     endif()
     option(CMAKE_USE_OPENSSL "Use OpenSSL." ${_CMAKE_USE_OPENSSL_DEFAULT})