diff --git a/Userland/Libraries/LibPthread/pthread.cpp b/Userland/Libraries/LibPthread/pthread.cpp
index 1d5ca118d7..b8f1ca1a71 100644
--- a/Userland/Libraries/LibPthread/pthread.cpp
+++ b/Userland/Libraries/LibPthread/pthread.cpp
@@ -580,6 +580,31 @@ int pthread_setcanceltype([[maybe_unused]] int type, [[maybe_unused]] int* oldty
     TODO();
 }
 
+int pthread_spin_destroy([[maybe_unused]] pthread_spinlock_t* lock)
+{
+    TODO();
+}
+
+int pthread_spin_init([[maybe_unused]] pthread_spinlock_t* lock, [[maybe_unused]] int shared)
+{
+    TODO();
+}
+
+int pthread_spin_lock([[maybe_unused]] pthread_spinlock_t* lock)
+{
+    TODO();
+}
+
+int pthread_spin_trylock([[maybe_unused]] pthread_spinlock_t* lock)
+{
+    TODO();
+}
+
+int pthread_spin_unlock([[maybe_unused]] pthread_spinlock_t* lock)
+{
+    TODO();
+}
+
 int pthread_equal(pthread_t t1, pthread_t t2)
 {
     return t1 == t2;
diff --git a/Userland/Libraries/LibPthread/pthread.h b/Userland/Libraries/LibPthread/pthread.h
index d801c85915..4c11c0089c 100644
--- a/Userland/Libraries/LibPthread/pthread.h
+++ b/Userland/Libraries/LibPthread/pthread.h
@@ -81,6 +81,9 @@ int pthread_setschedparam(pthread_t thread, int policy, const struct sched_param
 #define PTHREAD_MUTEX_DEFAULT PTHREAD_MUTEX_NORMAL
 #define PTHREAD_MUTEX_INITIALIZER __PTHREAD_MUTEX_INITIALIZER
 
+#define PTHREAD_PROCESS_PRIVATE 1
+#define PTHREAD_PROCESS_SHARED 2
+
 #define PTHREAD_COND_INITIALIZER     \
     {                                \
         0, 0, CLOCK_MONOTONIC_COARSE \