The failing command:
@g++ -c -O2 -g -pipe -pedantic -Wshadow -Wall -Wextra -Wno-missing-field-initializers -Wno-unused -Wno-trigraphs -fdiagnostics-show-option -Wno-unused-parameter     -Wlogical-op   -Wno-variadic-macros -Wno-long-long -Wunused-variable -Wunused-function -Wunused-label -Wunused-parameter  -Wno-overloaded-virtual -Wno-array-bounds -Wno-ignored-qualifiers -Wno-variadic-macros -O2 -fPIC -std=c++11 -fno-omit-frame-pointer -fno-strict-aliasing -fvisibility=hidden -DVBOX_HAVE_VISIBILITY_HIDDEN -DRT_USE_VISIBILITY_DEFAULT -fvisibility-inlines-hidden   -fPIC -m64 -I/ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/build -I/ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/Network/slirp -I/ext/tmp/SBo/VirtualBox-6.1.16/include/VBox/Graphics -I/ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/Network -I/ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/Network/lwip-new/src/include -I/ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/Network/lwip-new/src/include/ipv4 -I/ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/Network/lwip-new/src/include/ipv6 -I/ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/Network/lwip-new/vbox/include -I/ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/Network/lwip-new/vbox -I/ext/tmp/SBo/VirtualBox-6.1.16/out/linux.amd64/release/obj/VBoxDD/dtrace -I/ext/tmp/SBo/VirtualBox-6.1.16/out/linux.amd64/release/obj/VBoxDD/dtrace -I/ext/tmp/SBo/VirtualBox-6.1.16/include -I/ext/tmp/SBo/VirtualBox-6.1.16/out/linux.amd64/release -DRTPATH_APP_PRIVATE=\"/usr/share/virtualbox\" -DVBOX -DVBOX_OSE -DVBOX_WITH_64_BITS_GUESTS -DRTPATH_APP_PRIVATE=\"/usr/share/virtualbox\" -DRT_OS_LINUX -D_FILE_OFFSET_BITS=64 -DRT_ARCH_AMD64 -D__AMD64__ -DVBOX_WITH_DEBUGGER -DVBOX_WITH_HARDENING -DRTPATH_APP_PRIVATE=\"/usr/share/virtualbox\" -DRTPATH_APP_PRIVATE_ARCH=\"/usr/lib64/virtualbox\" -DRTPATH_SHARED_LIBS=\"/usr/lib64/virtualbox\" -DRTPATH_APP_DOCS=\"/usr/share/virtualbox\" -DIN_RING3 -DGC_ARCH_BITS=64 -DVBOX_WITH_DTRACE -DVBOX_WITH_DTRACE_R3 -DPIC -DVBOX_HGCM_HOST_CODE -DVBOX_WITH_HGCM -DVBOX_WITH_DMI_CHASSIS -DVBOX_WITH_DMI_OEMSTRINGS -DVBOX_WITH_NEW_LPC_DEVICE -DVBOX_WITH_DTRACE -DVBOXWDDM_WITH_VBVA -DVBOX_WITH_VIDEOHWACCEL -DVBOX_WITH_HGSMI -DVBOX_WITH_WDDM -DVBOX_WITH_VMSVGA -DVBOX_WITH_VMSVGA3D -DVMSVGA3D_OPENGL -DVMSVGA3D_DYNAMIC_LOAD -DVBOX_WITH_VDMA -DVBOX_WITH_PXE_ROM -DVBOX_WITH_USB -DVBOX_WITH_VUSB -DVBOX_WITH_INIP -DVBOX_WITH_E1000 -DVBOX_WITH_VIRTIO -DVBOX_WITH_UDPTUNNEL -DVBOX_WITH_VDE -DVBOX_WITH_NETSHAPER -DVBOX_WITH_AHCI -DIN_AHCI_R3 -DVBOX_WITH_BUSLOGIC -DVBOX_WITH_LSILOGIC -DVBOX_WITH_VIRTIO_SCSI -DVBOX_WITH_PDM_ASYNC_COMPLETION -DVBOX_WITH_SCSI -DVBOX_WITH_DRV_DISK_INTEGRITY -DVBOX_WITH_EFI -DVBOX_WITH_MSI_DEVICES -DVBOX_WITH_AUDIO_ENUM -DVBOX_WITH_AUDIO_CALLBACKS -DVBOX_WITH_INTEL_HDA -DVBOX_WITH_AUDIO_HDA_ASYNC_IO -DVBOX_WITH_AUDIO_DEBUG -DVBOX_WITH_AUDIO_OSS -DVBOX_WITH_AUDIO_ALSA -DVBOX_WITH_AUDIO_PULSE -DVBOX_WITH_NETFLT -DVBOX_WITH_EFI_IN_DD2 -DVUSB_HAVE_USBPROXY_DEVICE -DVBOX_USB_WITH_SYSFS -DHC_ARCH_BITS=64 -Wp,-MD,/ext/tmp/SBo/VirtualBox-6.1.16/out/linux.amd64/release/obj/VBoxDD/Graphics/DevVGA-SVGA3d-info.o.dep -Wp,-MT,/ext/tmp/SBo/VirtualBox-6.1.16/out/linux.amd64/release/obj/VBoxDD/Graphics/DevVGA-SVGA3d-info.o -Wp,-MP -o /ext/tmp/SBo/VirtualBox-6.1.16/out/linux.amd64/release/obj/VBoxDD/Graphics/DevVGA-SVGA3d-info.o  /ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/Graphics/DevVGA-SVGA3d-info.cpp
  CXX     VBoxDD - {C}/src/VBox/Devices/Graphics/DevVGA-SVGA3d-info.cpp
In file included from /ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/Graphics/DevVGA-SVGA3d-info.cpp:41:
/ext/tmp/SBo/VirtualBox-6.1.16/src/VBox/Devices/Graphics/DevVGA-SVGA3d-internal.h:1073:9: error: ‘PFNGLVERTEXATTRIBDIVISORPROC’ does not name a type; did you mean ‘PFNGLVERTEXATTRIBDIVISORARBPROC’?
 1073 |         PFNGLVERTEXATTRIBDIVISORPROC                    glVertexAttribDivisor;
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |         PFNGLVERTEXATTRIBDIVISORARBPROC
kmk: *** [/tmp/SBo/VirtualBox-6.1.16/kBuild/footer-pass2-compiling-targets.kmk:277: /ext/tmp/SBo/VirtualBox-6.1.16/out/linux.amd64/release/obj/VBoxDD/Graphics/DevVGA-SVGA3d-info.o] Error 1
  CXX     VBoxDD - {C}/src/VBox/Devices/Graphics/DevVGA-SVGA.cpp
kmk: *** Exiting with status 2