Fix missing include directory for IO blocks

src/stdfblib/CMakeLists.txt

@@ -18,5 +18,8 @@ SET(SOURCE_GROUP ${SOURCE_GROUP}\\fblib)
 forte_add_sourcefile_hcpp(timedfb)
 
 add_subdirectory(events)
+if(FORTE_IO)
+    add_subdirectory(io)
+endif()
 add_subdirectory(ita)
 add_subdirectory(net)

src/stdfblib/io/CMakeLists.txt

@@ -0,0 +1,14 @@
+#*******************************************************************************
+# Copyright (c) 2024 Martin Erich Jobst
+#
+# This program and the accompanying materials are made available under the
+# terms of the Eclipse Public License 2.0 which is available at
+# http://www.eclipse.org/legal/epl-2.0.
+#
+# SPDX-License-Identifier: EPL-2.0
+#
+# Contributors:
+#    Martin Jobst - initial API and implementation and/or initial documentation
+# *******************************************************************************/
+
+forte_add_include_directories(${CMAKE_CURRENT_SOURCE_DIR})