X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FEnvironment%2Fenvironment_ctrl.hxx;h=0ecf8db8bb0198bd6ef091768914dbe04e06274e;hb=11d15b451347674fba77648700d23c5aaec3c6c2;hp=76b6aab20e0f1820aa21f54a6d2c8a710e0f10df;hpb=5f134cdec82692e4a414af302a8f30c3825ebe64;p=flightgear.git

diff --git a/src/Environment/environment_ctrl.hxx b/src/Environment/environment_ctrl.hxx
index 76b6aab20..0ecf8db8b 100644
--- a/src/Environment/environment_ctrl.hxx
+++ b/src/Environment/environment_ctrl.hxx
@@ -40,6 +40,7 @@
 
 // forward decls
 class SGPropertyNode;
+class SGSampleGroup;
 class FGMetar;
 
 /**