diff --git a/debian/rules b/debian/rules
index 6b878de2c..a74aea48c 100644
--- a/debian/rules
+++ b/debian/rules
@@ -4,7 +4,7 @@
 
 # FORCE_SSE41 will be not accepted upstream
 override_dh_auto_configure:
-	dh_auto_configure -- -DFORCE_SSE41=ON
+	dh_auto_configure -- -DFORCE_SSE41=ON -DENABLE_EXTERNAL_LIBRARIES=ON
 
 # permit the packaging with /usr/local/lib libraries (from `make install`)
 # you can also use `export DEB_DH_SHLIBDEPS_ARGS_ALL=--dpkg-shlibdeps-params=--ignore-missing-info`
diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index d1d0be820..be9c26c21 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -9,7 +9,7 @@
 
 # which version/tag/checkout to use
 set(CODEC2_TAG 7a0187da3ffb06fd90c081216b50bab94d02d046)
-set(CM256CC_TAG 19f023d9d6c6f1a2e7dc5bcf466a1424c7918de4)
+set(CM256CC_TAG f21e8bc1e9afdb0b28672743dcec111aec1d32d9)
 set(MBELIB_TAG "debian/1.3.0")
 set(SERIALDV_TAG abd65a0fc2d5339808194862d14119b0cba70424)
 set(DSDCC_TAG 952fb5f5f7bf1928a290ad62acce35492df13f5d)