diff --git a/recipes-mac/smack/tcp-smack-test/tcp_server.c b/recipes-mac/smack/tcp-smack-test/tcp_server.c
index 3c8921f..248a5f6 100644
--- a/recipes-mac/smack/tcp-smack-test/tcp_server.c
+++ b/recipes-mac/smack/tcp-smack-test/tcp_server.c
@@ -18,8 +18,10 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/socket.h>
 #include <sys/types.h>
+#include <sys/xattr.h>
 #include <errno.h>
 #include <netinet/in.h>
 #include <unistd.h>
diff --git a/recipes-mac/smack/udp-smack-test/udp_client.c b/recipes-mac/smack/udp-smack-test/udp_client.c
index 976cbdc..00bb548 100644
--- a/recipes-mac/smack/udp-smack-test/udp_client.c
+++ b/recipes-mac/smack/udp-smack-test/udp_client.c
@@ -18,8 +18,10 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 #include <sys/socket.h>
+#include <sys/xattr.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
 #include <netinet/in.h>
 #include <netdb.h>
 #include <string.h>
diff --git a/recipes-mac/smack/udp-smack-test/udp_server.c b/recipes-mac/smack/udp-smack-test/udp_server.c
index 7d2fcf5..32b5442 100644
--- a/recipes-mac/smack/udp-smack-test/udp_server.c
+++ b/recipes-mac/smack/udp-smack-test/udp_server.c
@@ -18,10 +18,13 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 #include <sys/socket.h>
+#include <sys/xattr.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <netinet/in.h>
 #include <netdb.h>
 #include <string.h>
+#include <unistd.h>
 
 int main(int argc, char* argv[])
 {