X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FSound%2Ffg_sound.hxx;h=c1aaa567998b4aa4545257fb3b6707489fe4459f;hb=198b88ca9b4a4b123b2e9ccdc85ea17eeaea70c6;hp=d8f71357d7de3823f23c436d302ac2f7d5ce4009;hpb=cf7839a67b3f41a1b788902edce03fb9ede0b7a7;p=flightgear.git

diff --git a/src/Sound/fg_sound.hxx b/src/Sound/fg_sound.hxx
index d8f71357d..c1aaa5679 100644
--- a/src/Sound/fg_sound.hxx
+++ b/src/Sound/fg_sound.hxx
@@ -28,6 +28,8 @@
 #endif
 
 #include <simgear/compiler.h>
+#include <simgear/props/condition.hxx>
+
 #include <Main/fgfs.hxx>
 #include <Main/globals.hxx>