--- lib-src/libvamp/vamp-sdk/PluginAdapter.h
+++ lib-src/libvamp/vamp-sdk/PluginAdapter.h
@@ -37,6 +37,9 @@
 #ifndef _VAMP_PLUGIN_ADAPTER_H_
 #define _VAMP_PLUGIN_ADAPTER_H_
 
+#include <stdlib.h>
+#include <string.h>
+
 #include <vamp/vamp.h>
 
 #include "Plugin.h"
--- lib-src/libvamp/vamp-sdk/PluginHostAdapter.h
+++ lib-src/libvamp/vamp-sdk/PluginHostAdapter.h
@@ -37,6 +37,8 @@
 #ifndef _VAMP_PLUGIN_HOST_ADAPTER_H_
 #define _VAMP_PLUGIN_HOST_ADAPTER_H_
 
+#include <stdlib.h>
+
 #include <vamp/vamp.h>
 #include <vamp-sdk/Plugin.h>
 
--- lib-src/libvamp/vamp-sdk/hostext/PluginLoader.h
+++ lib-src/libvamp/vamp-sdk/hostext/PluginLoader.h
@@ -37,6 +37,8 @@
 #ifndef _VAMP_PLUGIN_LOADER_H_
 #define _VAMP_PLUGIN_LOADER_H_
 
+#include <string.h>
+
 #include <vector>
 #include <string>
 #include <map>