diff -urNd gdal-3.6.3/ogr/ogrsf_frmts/flatgeobuf/CMakeLists.txt gdal-3.6.3-c++-17/ogr/ogrsf_frmts/flatgeobuf/CMakeLists.txt
--- gdal-3.6.3/ogr/ogrsf_frmts/flatgeobuf/CMakeLists.txt	2023-04-20 20:28:21.002090619 +1000
+++ gdal-3.6.3-c++-17/ogr/ogrsf_frmts/flatgeobuf/CMakeLists.txt	2023-04-20 20:30:14.685009781 +1000
@@ -8,6 +8,7 @@
           ogrflatgeobufeditablelayer.cpp
           PLUGIN_CAPABLE
           NO_DEPS)
+set_property(TARGET ogr_FlatGeobuf PROPERTY CXX_STANDARD 17)
 gdal_standard_includes(ogr_FlatGeobuf)
 target_include_directories(ogr_FlatGeobuf PRIVATE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
                                                   $<TARGET_PROPERTY:ogrsf_generic,SOURCE_DIR>)