Refresh ld cache manually

Dockerfile-buildenv

@@ -22,7 +22,7 @@ RUN apt-get update && apt-get install -y \
 	--no-install-recommends `cat debian-8-packages.txt` \
 	&& tar xvf packages.tar \
 	&& dpkg -i packages/*.deb \
-	&& apt-get clean \
+	&& ldconfig \
 	&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
 	&& rm -rf packages packages.tar debian-8-packages.txt