diff --git a/openssl-sys/src/lib.rs b/openssl-sys/src/lib.rs
index 0f6a4483..04a50855 100644
--- a/openssl-sys/src/lib.rs
+++ b/openssl-sys/src/lib.rs
@@ -2614,14 +2614,14 @@ extern "C" {
     ) -> *mut SSL_SESSION;
     pub fn i2d_SSL_SESSION(s: *mut SSL_SESSION, pp: *mut *mut c_uchar) -> c_int;
 
-    #[cfg(ossl102)]
+    #[cfg(any(ossl102, libressl261))]
     pub fn SSL_CTX_set_alpn_protos(s: *mut SSL_CTX, data: *const c_uchar, len: c_uint) -> c_int;
 
-    #[cfg(ossl102)]
+    #[cfg(any(ossl102, libressl261))]
     pub fn SSL_set_alpn_protos(s: *mut SSL, data: *const c_uchar, len: c_uint) -> c_int;
 
     // FIXME should take an Option<unsafe extern "C" fn>
-    #[cfg(ossl102)]
+    #[cfg(any(ossl102, libressl261))]
     pub fn SSL_CTX_set_alpn_select_cb(
         ssl: *mut SSL_CTX,
         cb: extern "C" fn(
@@ -2634,7 +2634,7 @@ extern "C" {
         ) -> c_int,
         arg: *mut c_void,
     );
-    #[cfg(ossl102)]
+    #[cfg(any(ossl102, libressl261))]
     pub fn SSL_get0_alpn_selected(s: *const SSL, data: *mut *const c_uchar, len: *mut c_uint);
 
     pub fn X509_add_ext(x: *mut X509, ext: *mut X509_EXTENSION, loc: c_int) -> c_int;
diff --git a/openssl/src/ssl/callbacks.rs b/openssl/src/ssl/callbacks.rs
index 6ec9aef9..b23c60e7 100644
--- a/openssl/src/ssl/callbacks.rs
+++ b/openssl/src/ssl/callbacks.rs
@@ -1,9 +1,12 @@
 use ffi;
 use foreign_types::ForeignType;
 use foreign_types::ForeignTypeRef;
+#[cfg(not(osslconf = "OPENSSL_NO_PSK"))]
+use libc::c_char;
 #[cfg(ossl111)]
 use libc::size_t;
-use libc::{c_char, c_int, c_uchar, c_uint, c_void};
+use libc::{c_int, c_uchar, c_uint, c_void};
+#[cfg(not(osslconf = "OPENSSL_NO_PSK"))]
 use std::ffi::CStr;
 use std::mem;
 use std::ptr;
@@ -17,7 +20,7 @@ use dh::Dh;
 use ec::EcKey;
 use error::ErrorStack;
 use pkey::Params;
-#[cfg(ossl102)]
+#[cfg(any(ossl102, libressl261))]
 use ssl::AlpnError;
 #[cfg(ossl111)]
 use ssl::ExtensionContext;
@@ -130,7 +133,7 @@ where
     }
 }
 
-#[cfg(any(ossl102, ossl110))]
+#[cfg(any(ossl102, libressl261))]
 pub extern "C" fn raw_alpn_select<F>(
     ssl: *mut ffi::SSL,
     out: *mut *const c_uchar,
diff --git a/openssl/src/ssl/mod.rs b/openssl/src/ssl/mod.rs
index ce9c4b1d..08475888 100644
--- a/openssl/src/ssl/mod.rs
+++ b/openssl/src/ssl/mod.rs
@@ -85,6 +85,7 @@ use error::ErrorStack;
 use ex_data::Index;
 #[cfg(ossl111)]
 use hash::MessageDigest;
+#[cfg(ossl110)]
 use nid::Nid;
 use pkey::{HasPrivate, PKeyRef, Params, Private};
 use ssl::bio::BioMethod;
@@ -506,12 +507,12 @@ impl SslAlert {
 
 /// An error returned from an ALPN selection callback.
 ///
-/// Requires OpenSSL 1.0.2 or newer.
-#[cfg(any(ossl102, ossl110))]
+/// Requires OpenSSL 1.0.2 or LibreSSL 2.6.1 or newer.
+#[cfg(any(ossl102, libressl261))]
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub struct AlpnError(c_int);
 
-#[cfg(any(ossl102, ossl110))]
+#[cfg(any(ossl102, libressl261))]
 impl AlpnError {
     /// Terminate the handshake with a fatal alert.
     ///
@@ -1109,10 +1110,10 @@ impl SslContextBuilder {
     ///
     /// This corresponds to [`SSL_CTX_set_alpn_protos`].
     ///
-    /// Requires OpenSSL 1.0.2 or newer.
+    /// Requires OpenSSL 1.0.2 or LibreSSL 2.6.1 or newer.
     ///
     /// [`SSL_CTX_set_alpn_protos`]: https://www.openssl.org/docs/man1.1.0/ssl/SSL_CTX_set_alpn_protos.html
-    #[cfg(any(ossl102, ossl110))]
+    #[cfg(any(ossl102, libressl261))]
     pub fn set_alpn_protos(&mut self, protocols: &[u8]) -> Result<(), ErrorStack> {
         unsafe {
             assert!(protocols.len() <= c_uint::max_value() as usize);
@@ -1140,12 +1141,12 @@ impl SslContextBuilder {
     ///
     /// This corresponds to [`SSL_CTX_set_alpn_select_cb`].
     ///
-    /// Requires OpenSSL 1.0.2 or newer.
+    /// Requires OpenSSL 1.0.2 or LibreSSL 2.6.1 or newer.
     ///
     /// [`SslContextBuilder::set_alpn_protos`]: struct.SslContextBuilder.html#method.set_alpn_protos
     /// [`select_next_proto`]: fn.select_next_proto.html
     /// [`SSL_CTX_set_alpn_select_cb`]: https://www.openssl.org/docs/man1.1.0/ssl/SSL_CTX_set_alpn_protos.html
-    #[cfg(any(ossl102, ossl110))]
+    #[cfg(any(ossl102, libressl261))]
     pub fn set_alpn_select_callback<F>(&mut self, callback: F)
     where
         F: for<'a> Fn(&mut SslRef, &'a [u8]) -> Result<&'a [u8], AlpnError> + 'static + Sync + Send,
@@ -2283,12 +2284,12 @@ impl SslRef {
     /// The protocol's name is returned is an opaque sequence of bytes. It is up to the client
     /// to interpret it.
     ///
-    /// Requires OpenSSL 1.0.2 or newer.
+    /// Requires OpenSSL 1.0.2 or LibreSSL 2.6.1 or newer.
     ///
     /// This corresponds to [`SSL_get0_alpn_selected`].
     ///
     /// [`SSL_get0_alpn_selected`]: https://www.openssl.org/docs/manmaster/man3/SSL_get0_next_proto_negotiated.html
-    #[cfg(any(ossl102, ossl110))]
+    #[cfg(any(ossl102, libressl261))]
     pub fn selected_alpn_protocol(&self) -> Option<&[u8]> {
         unsafe {
             let mut data: *const c_uchar = ptr::null();
diff --git a/openssl/src/ssl/test.rs b/openssl/src/ssl/test.rs
index f2dc4a65..0d418d2c 100644
--- a/openssl/src/ssl/test.rs
+++ b/openssl/src/ssl/test.rs
@@ -481,7 +481,7 @@ fn test_state() {
 /// Tests that connecting with the client using ALPN, but the server not does not
 /// break the existing connection behavior.
 #[test]
-#[cfg(any(ossl102, ossl110))]
+#[cfg(any(ossl102, libressl261))]
 fn test_connect_with_unilateral_alpn() {
     let (_s, stream) = Server::new();
     let mut ctx = SslContext::builder(SslMethod::tls()).unwrap();
@@ -503,7 +503,7 @@ fn test_connect_with_unilateral_alpn() {
 /// Tests that when both the client as well as the server use ALPN and their
 /// lists of supported protocols have an overlap, the correct protocol is chosen.
 #[test]
-#[cfg(any(ossl102, ossl110))]
+#[cfg(any(ossl102, libressl261))]
 fn test_connect_with_alpn_successful_multiple_matching() {
     let (_s, stream) = Server::new_alpn();
     let mut ctx = SslContext::builder(SslMethod::tls()).unwrap();
@@ -526,7 +526,7 @@ fn test_connect_with_alpn_successful_multiple_matching() {
 /// lists of supported protocols have an overlap -- with only ONE protocol
 /// being valid for both.
 #[test]
-#[cfg(any(ossl102, ossl110))]
+#[cfg(any(ossl102, libressl261))]
 fn test_connect_with_alpn_successful_single_match() {
     let (_s, stream) = Server::new_alpn();
     let mut ctx = SslContext::builder(SslMethod::tls()).unwrap();
@@ -548,7 +548,7 @@ fn test_connect_with_alpn_successful_single_match() {
 /// Tests that when the `SslStream` is created as a server stream, the protocols
 /// are correctly advertised to the client.
 #[test]
-#[cfg(any(ossl102, ossl110))]
+#[cfg(any(ossl102, libressl261))]
 fn test_alpn_server_advertise_multiple() {
     let listener = TcpListener::bind("127.0.0.1:0").unwrap();
     let localhost = listener.local_addr().unwrap();
@@ -624,7 +624,7 @@ fn test_alpn_server_select_none_fatal() {
 }
 
 #[test]
-#[cfg(any(ossl102, ossl110))]
+#[cfg(any(ossl102, libressl261))]
 fn test_alpn_server_select_none() {
     let listener = TcpListener::bind("127.0.0.1:0").unwrap();
     let localhost = listener.local_addr().unwrap();