diff --git a/src/rucksack.mk b/src/rucksack.mk
index 3db9c8db..89c78b04 100644
--- a/src/rucksack.mk
+++ b/src/rucksack.mk
@@ -29,3 +29,4 @@ define $(PKG)_BUILD
         `'$(TARGET)-pkg-config' freeimage --cflags --libs`
 endef
 
+$(PKG)_BUILD_SHARED =