--- src/csoundengine.cpp	2020-01-16
+++ src/csoundengine.cpp	2023-12-31
@@ -20,6 +20,8 @@
     02111-1307 USA
 */
 
+#include <unistd.h>
+
 #ifdef USE_QT5
 #include <QtConcurrent>
 #endif

--- src/widgetlayout.cpp	2020-01-16
+++ src/widgetlayout.cpp	2023-12-31
@@ -21,6 +21,7 @@
 */
 
 #include <cstdlib>
+#include <unistd.h>
 
 #include <QThread>