diff --git a/configure.ac b/configure.ac
index 239e919c..90335b4a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,7 +54,7 @@ AM_CONDITIONAL([AIX],      [AS_CASE([$host_os],[aix*],          [true], [false])
 AM_CONDITIONAL([ANDROID],  [AS_CASE([$host_os],[linux-android*],[true], [false])])
 AM_CONDITIONAL([DARWIN],   [AS_CASE([$host_os],[darwin*],       [true], [false])])
 AM_CONDITIONAL([DRAGONFLY],[AS_CASE([$host_os],[dragonfly*],    [true], [false])])
-AM_CONDITIONAL([FREEBSD],  [AS_CASE([$host_os],[freebsd*],      [true], [false])])
+AM_CONDITIONAL([FREEBSD],  [AS_CASE([$host_os],[*freebsd*],     [true], [false])])
 AM_CONDITIONAL([LINUX],    [AS_CASE([$host_os],[linux*],        [true], [false])])
 AM_CONDITIONAL([NETBSD],   [AS_CASE([$host_os],[netbsd*],       [true], [false])])
 AM_CONDITIONAL([OPENBSD],  [AS_CASE([$host_os],[openbsd*],      [true], [false])])
diff --git a/include/uv-errno.h b/include/uv-errno.h
index 53f30296..f1371517 100644
--- a/include/uv-errno.h
+++ b/include/uv-errno.h
@@ -408,6 +408,7 @@
 #elif defined(__APPLE__) || \
       defined(__DragonFly__) || \
       defined(__FreeBSD__) || \
+      defined(__FreeBSD_kernel__) || \
       defined(__NetBSD__) || \
       defined(__OpenBSD__)
 # define UV__EHOSTDOWN (-64)
diff --git a/include/uv-unix.h b/include/uv-unix.h
index a852c40e..bca27144 100644
--- a/include/uv-unix.h
+++ b/include/uv-unix.h
@@ -50,9 +50,10 @@
 # include "uv-sunos.h"
 #elif defined(__APPLE__)
 # include "uv-darwin.h"
-#elif defined(__DragonFly__)  || \
-      defined(__FreeBSD__)    || \
-      defined(__OpenBSD__)    || \
+#elif defined(__DragonFly__)       || \
+      defined(__FreeBSD__)         || \
+      defined(__FreeBSD_kernel__)  || \
+      defined(__OpenBSD__)         || \
       defined(__NetBSD__)
 # include "uv-bsd.h"
 #endif
diff --git a/src/unix/core.c b/src/unix/core.c
index 3df966e2..d88fc1de 100644
--- a/src/unix/core.c
+++ b/src/unix/core.c
@@ -55,7 +55,9 @@
 # endif
 #endif
 
-#if defined(__FreeBSD__) || defined(__DragonFly__)
+#if defined(__DragonFly__)      || \
+    defined(__FreeBSD__)        || \
+    defined(__FreeBSD_kernel__)
 # include <sys/sysctl.h>
 # include <sys/filio.h>
 # include <sys/wait.h>
diff --git a/src/unix/fs.c b/src/unix/fs.c
index 0b2505e4..37f8e3b6 100644
--- a/src/unix/fs.c
+++ b/src/unix/fs.c
@@ -46,9 +46,10 @@
 #include <utime.h>
 #include <poll.h>
 
-#if defined(__DragonFly__)  ||                                            \
-    defined(__FreeBSD__)    ||                                            \
-    defined(__OpenBSD__)    ||                                            \
+#if defined(__DragonFly__)        ||                                      \
+    defined(__FreeBSD__)          ||                                      \
+    defined(__FreeBSD_kernel_)    ||                                      \
+    defined(__OpenBSD__)          ||                                      \
     defined(__NetBSD__)
 # define HAVE_PREADV 1
 #else
@@ -193,6 +194,7 @@ skip:
 #elif defined(__APPLE__)                                                      \
     || defined(__DragonFly__)                                                 \
     || defined(__FreeBSD__)                                                   \
+    || defined(__FreeBSD_kernel__)                                            \
     || defined(__NetBSD__)                                                    \
     || defined(__OpenBSD__)                                                   \
     || defined(__sun)
@@ -595,7 +597,10 @@ static ssize_t uv__fs_sendfile(uv_fs_t* req) {
 
     return -1;
   }
-#elif defined(__FreeBSD__) || defined(__APPLE__) || defined(__DragonFly__)
+#elif defined(__APPLE__)           || \
+      defined(__DragonFly__)       || \
+      defined(__FreeBSD__)         || \
+      defined(__FreeBSD_kernel__)
   {
     off_t len;
     ssize_t r;
@@ -608,6 +613,15 @@ static ssize_t uv__fs_sendfile(uv_fs_t* req) {
 #if defined(__FreeBSD__) || defined(__DragonFly__)
     len = 0;
     r = sendfile(in_fd, out_fd, req->off, req->bufsml[0].len, NULL, &len, 0);
+#elif defined(__FreeBSD_kernel__)
+    len = 0;
+    r = bsd_sendfile(in_fd,
+                     out_fd,
+                     req->off,
+                     req->bufsml[0].len,
+                     NULL,
+                     &len,
+                     0);
 #else
     /* The darwin sendfile takes len as an input for the length to send,
      * so make sure to initialize it with the caller's value. */
diff --git a/src/unix/internal.h b/src/unix/internal.h
index 4cae7376..7cc8ee8b 100644
--- a/src/unix/internal.h
+++ b/src/unix/internal.h
@@ -156,6 +156,7 @@ struct uv__stream_queued_fds_s {
     defined(__APPLE__) || \
     defined(__DragonFly__) || \
     defined(__FreeBSD__) || \
+    defined(__FreeBSD_kernel__) || \
     defined(__linux__)
 #define uv__cloexec uv__cloexec_ioctl
 #define uv__nonblock uv__nonblock_ioctl
diff --git a/src/unix/process.c b/src/unix/process.c
index 8a010edc..45f5b452 100644
--- a/src/unix/process.c
+++ b/src/unix/process.c
@@ -40,7 +40,7 @@
 extern char **environ;
 #endif
 
-#ifdef __linux__
+#if defined(__linux__) || defined(__GLIBC__)
 # include <grp.h>
 #endif
 
diff --git a/src/unix/tty.c b/src/unix/tty.c
index fd4bcbcf..b2d37f4c 100644
--- a/src/unix/tty.c
+++ b/src/unix/tty.c
@@ -40,7 +40,7 @@ static uv_spinlock_t termios_spinlock = UV_SPINLOCK_INITIALIZER;
 
 static int uv__tty_is_slave(const int fd) {
   int result;
-#if defined(__linux__) || defined(__FreeBSD__)
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
   int dummy;
 
   result = ioctl(fd, TIOCGPTN, &dummy) != 0;
diff --git a/test/test-embed.c b/test/test-embed.c
index 06137456..c6ddceb1 100644
--- a/test/test-embed.c
+++ b/test/test-embed.c
@@ -29,6 +29,7 @@
 # if defined(__APPLE__) ||                                                    \
      defined(__DragonFly__) ||                                                \
      defined(__FreeBSD__) ||                                                  \
+     defined(__FreeBSD_kernel__) ||                                           \
      defined(__OpenBSD__) ||                                                  \
      defined(__NetBSD__)
 #  define HAVE_KQUEUE 1
diff --git a/test/test-fs-event.c b/test/test-fs-event.c
index 7dd2cb39..fc6e8ad9 100644
--- a/test/test-fs-event.c
+++ b/test/test-fs-event.c
@@ -29,6 +29,7 @@
 # if defined(__APPLE__) ||                                                    \
      defined(__DragonFly__) ||                                                \
      defined(__FreeBSD__) ||                                                  \
+     defined(__FreeBSD_kernel__) ||                                           \
      defined(__OpenBSD__) ||                                                  \
      defined(__NetBSD__)
 #  define HAVE_KQUEUE 1
diff --git a/test/test-poll.c b/test/test-poll.c
index 848ce88a..6c1f98b7 100644
--- a/test/test-poll.c
+++ b/test/test-poll.c
@@ -594,7 +594,7 @@ TEST_IMPL(poll_unidirectional) {
  */
 TEST_IMPL(poll_bad_fdtype) {
 #if !defined(__DragonFly__) && !defined(__FreeBSD__) && !defined(__sun) && \
-    !defined(_AIX) && !defined(__MVS__)
+    !defined(_AIX) && !defined(__MVS__) && !defined(__FreeBSD_kernel__)
   uv_poll_t poll_handle;
   int fd;
 
diff --git a/test/test-tty.c b/test/test-tty.c
index c93fe75a..780968c4 100644
--- a/test/test-tty.c
+++ b/test/test-tty.c
@@ -28,7 +28,7 @@
 #else /*  Unix */
 # include <fcntl.h>
 # include <unistd.h>
-# if defined(__linux__) && !defined(__ANDROID__)
+# if (defined(__linux__) || defined(__GLIBC__)) && !defined(__ANDROID__)
 #  include <pty.h>
 # elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
 #  include <util.h>
@@ -260,8 +260,14 @@ TEST_IMPL(tty_file) {
 }
 
 TEST_IMPL(tty_pty) {
-# if defined(__linux__) && !defined(__ANDROID__) || defined(__OpenBSD__) || defined(__NetBSD__) || \
-    defined(__APPLE__) || defined(__FreeBSD__) || defined(__DragonFly__)
+#if defined(__ANDROID__)         || \
+    defined(__APPLE__)           || \
+    defined(__DragonFly__)       || \
+    defined(__FreeBSD__)         || \
+    defined(__FreeBSD_kernel__)  || \
+    defined(__linux__)           || \
+    defined(__NetBSD__)          || \
+    defined(__OpenBSD__)
   int master_fd, slave_fd, r;
   struct winsize w;
   uv_loop_t loop;
diff --git a/test/test-udp-ipv6.c b/test/test-udp-ipv6.c
index 1b0db78b..a65f09e0 100644
--- a/test/test-udp-ipv6.c
+++ b/test/test-udp-ipv6.c
@@ -26,7 +26,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 #include <sys/sysctl.h>
 #endif
 
@@ -47,7 +47,7 @@ static int send_cb_called;
 static int recv_cb_called;
 static int close_cb_called;
 
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 static int can_ipv6_ipv4_dual() {
   int v6only;
   size_t size = sizeof(int);
@@ -166,7 +166,7 @@ TEST_IMPL(udp_dual_stack) {
   if (!can_ipv6())
     RETURN_SKIP("IPv6 not supported");
 
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
   if (!can_ipv6_ipv4_dual())
     RETURN_SKIP("IPv6-IPv4 dual stack not supported");
 #endif
diff --git a/test/test-udp-multicast-interface6.c b/test/test-udp-multicast-interface6.c
index d3881e83..40b05536 100644
--- a/test/test-udp-multicast-interface6.c
+++ b/test/test-udp-multicast-interface6.c
@@ -72,7 +72,7 @@ TEST_IMPL(udp_multicast_interface6) {
   r = uv_udp_bind(&server, (const struct sockaddr*)&baddr, 0);
   ASSERT(r == 0);
 
-#if defined(__APPLE__) || defined(__FreeBSD__)
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
   r = uv_udp_set_multicast_interface(&server, "::1%lo0");
 #else
   r = uv_udp_set_multicast_interface(&server, NULL);
diff --git a/test/test-udp-multicast-join6.c b/test/test-udp-multicast-join6.c
index 26a27d60..2eb9e920 100644
--- a/test/test-udp-multicast-join6.c
+++ b/test/test-udp-multicast-join6.c
@@ -119,7 +119,10 @@ TEST_IMPL(udp_multicast_join6) {
   ASSERT(r == 0);
 
   /* join the multicast channel */
-#if defined(__APPLE__) || defined(_AIX) || defined(__MVS__)
+#if defined(__APPLE__)          || \
+    defined(_AIX)               || \
+    defined(__MVS__)            || \
+    defined(__FreeBSD_kernel__)
   r = uv_udp_set_membership(&client, "ff02::1", "::1%lo0", UV_JOIN_GROUP);
 #else
   r = uv_udp_set_membership(&client, "ff02::1", NULL, UV_JOIN_GROUP);