diff --git a/config/cmake/hdf5-config.cmake.in b/config/cmake/hdf5-config.cmake.in
index 6780101..fe5e23d 100644
--- a/config/cmake/hdf5-config.cmake.in
+++ b/config/cmake/hdf5-config.cmake.in
@@ -97,6 +97,16 @@ if (${HDF5_PACKAGE_NAME}_ENABLE_THREADSAFE OR ${HDF5_PACKAGE_NAME}_ENABLE_SUBFIL
   find_package(Threads QUIET REQUIRED)
 endif ()
 
+if (${HDF5_PACKAGE_NAME}_ENABLE_Z_LIB_SUPPORT AND NOT ${HDF5_PACKAGE_NAME}_PACKAGE_EXTLIBS)
+  include(CMakeFindDependencyMacro)
+  find_dependency(ZLIB)
+endif ()
+
+if (${HDF5_PACKAGE_NAME}_ENABLE_SZIP_SUPPORT AND NOT ${HDF5_PACKAGE_NAME}_PACKAGE_EXTLIBS)
+  include(CMakeFindDependencyMacro)
+  find_dependency(libaec)
+endif ()
+
 if (${HDF5_PACKAGE_NAME}_BUILD_JAVA)
   set (${HDF5_PACKAGE_NAME}_JAVA_INCLUDE_DIRS
       @PACKAGE_CURRENT_BUILD_DIR@/lib/jarhdf5-@HDF5_VERSION_STRING@.jar