diff --git a/contrib/gitian-descriptors/gitian-osx.yml b/contrib/gitian-descriptors/gitian-osx.yml
--- a/contrib/gitian-descriptors/gitian-osx.yml
+++ b/contrib/gitian-descriptors/gitian-osx.yml
@@ -11,6 +11,7 @@
 - "automake"
 - "bsdmainutils"
 - "ca-certificates"
+- "clang"
 - "cmake"
 - "curl"
 - "faketime"
@@ -22,6 +23,7 @@
 - "libtinfo5"
 - "libtool"
 - "libz-dev"
+- "llvm-dev"
 - "ninja-build"
 - "pkg-config"
 - "python3"
@@ -99,7 +101,7 @@
 
   # Build dependencies for each host
   for i in ${HOSTS[@]}; do
-    make ${MAKEOPTS} -C ${BASEPREFIX} HOST="${i}"
+    make ${MAKEOPTS} -C ${BASEPREFIX} HOST="${i}" FORCE_USE_SYSTEM_CLANG=1 V=1
   done
 
   # Faketime for binaries