[coreboot] FsptUpd.h: No such file or directory - compilation terminated - Error 1

[James Feeney]

$ cat defconfig
...
CONFIG_ADD_FSP_BINARIES=y
...

There is *no* "fspt.bin" file in this chromebook recovery bios file used as source.

$ make
...
src/soc/intel/apollolake/fspcar.c:3:10: fatal error: FsptUpd.h: No such file or directory
 #include <FsptUpd.h>
          ^~~~~~~~~~~
compilation terminated.
make: *** [Makefile:379: build/bootblock/soc/intel/apollolake/fspcar.o] Error 1

What Makefile is that?  There is no such line 379.

$ find -name FsptUpd.h
...
./3rdparty/fsp/ApolloLakeFspBinPkg/Include/FsptUpd.h
...

$ less src/soc/intel/alderlake/Kconfig
...
config FSP_HEADER_PATH
        string "Location of FSP headers"
        default "src/vendorcode/intel/fsp/fsp2_0/alderlake/"

$ less src/drivers/intel/fsp2_0/Kconfig
...

config FSP_T_FILE
        string "Intel FSP-T (temp RAM init) binary path and filename" if !FSP_FULL_FD
        depends on ADD_FSP_BINARIES
        depends on FSP_CAR
        default "$(obj)/Fsp_T.fd" if FSP_FULL_FD
        help
          The path and filename of the Intel FSP-T binary for this platform.

$ make nconfig
...
    > Generic Drivers
...
    (src/vendorcode/intel/fsp/fsp2_0/glk) Location of FSP headers

How did that get there?  Not me...

$ ll src/vendorcode/intel/fsp/fsp2_0/glk
total 116
drwxr-x--- 2 james james  4096 Oct 29  2020 .
drwxr-x--- 9 james james  4096 Jun 14 19:04 ..
-rw-r----- 1 james james 45977 Oct 29  2020 FspmUpd.h
-rw-r----- 1 james james 57332 Oct 29  2020 FspsUpd.h
-rw-r----- 1 james james  1967 Oct 29  2020 FspUpd.h

Why is src/soc/intel/apollolake/fspcar.c being built here?  It seems that no fspt.bin file is needed.

James