diff --git a/recipes-mac/smack/tcp-smack-test/tcp_client.c b/recipes-mac/smack/tcp-smack-test/tcp_client.c
index 6c0a474..b82b575 100644
--- a/recipes-mac/smack/tcp-smack-test/tcp_client.c
+++ b/recipes-mac/smack/tcp-smack-test/tcp_client.c
@@ -18,6 +18,7 @@
 // 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 <errno.h>
diff --git a/recipes-mac/smack/tcp-smack-test/tcp_server.c b/recipes-mac/smack/tcp-smack-test/tcp_server.c
index 3c8921f..6de7ccd 100644
--- a/recipes-mac/smack/tcp-smack-test/tcp_server.c
+++ b/recipes-mac/smack/tcp-smack-test/tcp_server.c
@@ -24,6 +24,9 @@
 #include <netinet/in.h>
 #include <unistd.h>
 #include <string.h>
+#include <stdlib.h>
+#include <sys/xattr.h>
+
 
 int main(int argc, char* argv[])
 {
diff --git a/recipes-mac/smack/udp-smack-test/udp_client.c b/recipes-mac/smack/udp-smack-test/udp_client.c
index 23f3e00..3d2ee31 100644
--- a/recipes-mac/smack/udp-smack-test/udp_client.c
+++ b/recipes-mac/smack/udp-smack-test/udp_client.c
@@ -19,6 +19,9 @@
 // THE SOFTWARE.
 #include <sys/socket.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/xattr.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..25ad1ef 100644
--- a/recipes-mac/smack/udp-smack-test/udp_server.c
+++ b/recipes-mac/smack/udp-smack-test/udp_server.c
@@ -22,6 +22,9 @@
 #include <netinet/in.h>
 #include <netdb.h>
 #include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/xattr.h>
 
 int main(int argc, char* argv[])
 {