The API changed pthread to scope, so it can load multiple instances.

exchange/bitswap/bitswap.c

@@ -3,6 +3,7 @@
  */
 #include <stdlib.h>
 #include <unistd.h> // for sleep()
+#include <pthread.h>
 #include "libp2p/os/utils.h"
 #include "libp2p/utils/logger.h"
 #include "ipfs/core/ipfs_node.h"

exchange/bitswap/engine.c

@@ -1,4 +1,6 @@
 #include <unistd.h>
+#include <pthread.h>
+
 #include "libp2p/utils/logger.h"
 #include "ipfs/core/null.h"
 #include "ipfs/exchange/bitswap/engine.h"

exchange/bitswap/network.c

@@ -5,6 +5,8 @@
  * For a somewhat accurate diagram of how this may work, @see https://github.com/ipfs/js-ipfs-bitswap
  */
 
+#include <pthread.h>
+
 #include "libp2p/utils/logger.h"
 #include "ipfs/exchange/bitswap/network.h"
 #include "ipfs/exchange/bitswap/peer_request_queue.h"

exchange/bitswap/want_manager.c

@@ -1,3 +1,5 @@
+#include <pthread.h>
+
 #include "ipfs/exchange/bitswap/want_manager.h"
 #include "ipfs/exchange/bitswap/wantlist_queue.h"