--- e_os.h.orig	2019-02-13 14:25:17.725058588 +0000
+++ e_os.h	2019-02-13 14:35:39.790029062 +0000
@@ -350,7 +350,12 @@
 # endif
 
 /* unistd.h defines _POSIX_VERSION */
-# if !defined(OPENSSL_NO_SECURE_MEMORY) && defined(OPENSSL_SYS_UNIX) \
+# if !defined(OPENSSL_NO_SECURE_MEMORY) \
+    && !defined(OPENSSL_SYS_RISCOS) \
+    && !defined(OPENSSL_SYS_AMIGAOS3) \
+    && !defined(OPENSSL_SYS_AMIGAOS4) \
+    && !defined(OPENSSL_SYS_MINT) \
+    && defined(OPENSSL_SYS_UNIX) \
      && ( (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L)      \
           || defined(__sun) || defined(__hpux) || defined(__sgi)      \
           || defined(__osf__) )