--- ffDiaporama/src/ffDiaporama/ffDiaporama.pro	2022-02-05 13:57:33.257054400 +0100
+++ ffDiaporama/src/ffDiaporama/ffDiaporama.pro	2022-02-05 13:58:26.565964600 +0100
@@ -78,7 +78,7 @@
         LIBS        += -lswresample
 
     } else {
-
+        DEFINES+=_GNU_SOURCE
         HARDWARE_PLATFORM = $$system(uname -m)
         contains(HARDWARE_PLATFORM,x86_64) {
             DEFINES+=Q_OS_LINUX64