diff --git a/src/apps/aboutsystem/Jamfile b/src/apps/aboutsystem/Jamfile
index 12e05f2915..ea0c00236c 100644
--- a/src/apps/aboutsystem/Jamfile
+++ b/src/apps/aboutsystem/Jamfile
@@ -2,18 +2,6 @@ SubDir HAIKU_TOP src apps aboutsystem ;
 
 UsePrivateHeaders app shared ;
 
-SetSubDirSupportedPlatformsBeOSCompatible ;
-
-if ! $(TARGET_PLATFORM_HAIKU_COMPATIBLE) {
-	UseHeaders [ FDirName $(HAIKU_TOP) headers os kernel ] : true ;
-}
-if $(TARGET_PLATFORM) = r5 {
-	SubDirC++Flags -DR5_COMPATIBLE ;
-}
-if $(TARGET_PLATFORM) = dano {
-	SubDirC++Flags -DR5_COMPATIBLE ;
-}
-
 Application AboutSystem :
 	AboutSystem.cpp
 	HyperTextActions.cpp