Do not export bundled subdirectory if empty

Avoid recording a nonexistent include directory in case we do not
install any bundled header files.

diff --git a/cmake/config/CMakeLists.txt b/cmake/config/CMakeLists.txt
index 2b99e76366aa0f94bb4a29f2db62b0ec64eb6f1b..fc9bfa923ffa2b94338a4ea08194811f2d9ab345 100644 (file)
--- a/cmake/config/CMakeLists.txt
+++ b/cmake/config/CMakeLists.txt
@@ -150,10 +150,20 @@ CONFIGURE_FILE(
 # For installation:
 #
 
+# Make sure that we only ever record the bundled subdirectory if it is in
+# fact created:
+IF("${DEAL_II_BUNDLED_INCLUDE_DIRS}" STREQUAL "")
+  SET(_installed_bundled "")
+ELSE()
+  SET(_installed_bundled
+    "\${DEAL_II_PATH}/\${DEAL_II_INCLUDE_RELDIR}/deal.II/bundled"
+    )
+ENDIF()
+
 SET(CONFIG_BUILD_DIR FALSE)
 SET(CONFIG_INCLUDE_DIRS
   \${DEAL_II_PATH}/\${DEAL_II_INCLUDE_RELDIR}
-  \${DEAL_II_PATH}/\${DEAL_II_INCLUDE_RELDIR}/deal.II/bundled
+  ${_installed_bundled}
   ${DEAL_II_USER_INCLUDE_DIRS}
   )