autoconf pieces for U2F support

Mostly following existing logic for PKCS#11 - turning off support
when either libcrypto or dlopen(3) are unavailable.

1 files changed, 3 insertions, 0 deletions

diff --git a/ssh-sk.c b/ssh-sk.c
index 7d313f57b..122a1e2b7 100644
--- a/ssh-sk.c
+++ b/ssh-sk.c
@@ -19,6 +19,8 @@
 
 #include "includes.h"
 
+#ifdef ENABLE_SK
+
 #include <dlfcn.h>
 #include <stddef.h>
 #include <stdint.h>
@@ -375,3 +377,4 @@ sshsk_ecdsa_sign(const char *provider_path, const struct sshkey *key,
         sshbuf_free(inner_sig);
         return r;
 }
+#endif /* ENABLE_SK */