diff --git a/package/bullet/bullet.mk b/package/bullet/bullet.mk
index 1345f37..7ff8195 100644
--- a/package/bullet/bullet.mk
+++ b/package/bullet/bullet.mk
@@ -16,4 +16,11 @@
 	-DBUILD_BULLET2_DEMOS=OFF \
 	-DBUILD_BULLET3=OFF
 
+# extras needs dlfcn.h and threads
+ifeq ($(BR2_STATIC_LIBS):$(BR2_TOOLCHAIN_HAS_THREADS),:y)
+BULLET_CONF_OPTS += -DBUILD_EXTRAS=ON
+else
+BULLET_CONF_OPTS += -DBUILD_EXTRAS=OFF
+endif
+
 $(eval $(cmake-package))