e_os.h does not belong with the exported headers. Do not put it there
and make all files the depend on it include it without prefixing it
with openssl/.
This means that all Makefiles will have $(TOP) as one of the include
directories.
diff --git a/crypto/bio/bss_bio.c b/crypto/bio/bss_bio.c
index 78c6ab4..4e46c6c 100644
--- a/crypto/bio/bss_bio.c
+++ b/crypto/bio/bss_bio.c
@@ -22,7 +22,7 @@
#include <openssl/err.h>
#include <openssl/crypto.h>
-#include "openssl/e_os.h"
+#include "e_os.h"
#ifndef SSIZE_MAX
# define SSIZE_MAX INT_MAX
#endif
