diff --git a/3rdparty/mmu_man/Jamfile b/3rdparty/mmu_man/Jamfile
index 2e9b0b346a..a104404066 100644
--- a/3rdparty/mmu_man/Jamfile
+++ b/3rdparty/mmu_man/Jamfile
@@ -1,6 +1,14 @@
 SubDir HAIKU_TOP 3rdparty mmu_man ;
 
-SubInclude HAIKU_TOP 3rdparty mmu_man themes ;
+# theme manager from osdrawer
+# to use it symlink it here.
+{
+	local subDir
+		= [ GLOB [ FDirName $(HAIKU_TOP) 3rdparty mmu_man ] : themes ] ;
+	if $(subDir) {
+		SubInclude HAIKU_TOP 3rdparty mmu_man themes ;
+	}
+}
 
 # distro stuff located in my own branch, 
 # to use it symlink it here.