diff --git a/builtins/davix/CMakeLists.txt b/builtins/davix/CMakeLists.txt
index e56369729aa0d..f36a475c34474 100644
--- a/builtins/davix/CMakeLists.txt
+++ b/builtins/davix/CMakeLists.txt
@@ -35,7 +35,7 @@ ExternalProject_Add(DAVIX
     -DLIBXML2_LIBRARY:PATH=${LIBXML2_LIBRARY}
     -DLIBXML2_LIBRARIES:STRING=${LIBXML2_LIBRARIES}
   CMAKE_ARGS
-    -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
+    -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}/include/ROOT_builtins}
     -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
     -DENABLE_HTML_DOCS=OFF
     -DENABLE_IPV6=OFF
diff --git a/builtins/pcre/CMakeLists.txt b/builtins/pcre/CMakeLists.txt
index 515e52402ff2b..6637fc10da9e4 100644
--- a/builtins/pcre/CMakeLists.txt
+++ b/builtins/pcre/CMakeLists.txt
@@ -44,7 +44,7 @@ ExternalProject_Add(PCRE
   LOG_INSTALL   TRUE
 
   CMAKE_CACHE_ARGS
-    -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
+    -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_INSTALL_PREFIX}/include/ROOT_builtins}
     -DCMAKE_GENERATOR:STRING=${CMAKE_GENERATOR}
     -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
     -DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}