diff -ura bro-git/cmake/OpenSSLTests.cmake bro-git.patched/cmake/OpenSSLTests.cmake
--- bro-git/cmake/OpenSSLTests.cmake	2018-05-14 13:57:32.724543674 -0500
+++ bro-git.patched/cmake/OpenSSLTests.cmake	2018-05-14 13:58:36.355861923 -0500
@@ -81,7 +81,7 @@
     " OPENSSL_CORRECT_VERSION_NUMBER )
 
     if (NOT OPENSSL_CORRECT_VERSION_NUMBER)
-        message(FATAL_ERROR
+        message(WARNING
             "OpenSSL library version does not match headers")
     endif ()
 endif ()