postgis: missing PROTOCC

[bitozoid]

FOr =dev-db/postgis-3.0.0-r1, when protobuf flag is disabled, PROTOCC gets no value and compilation fails.

# grep -P "^PROTOCC" work/POSTGRESQL_SERVERS/12/postgis-3.0.0/postgis/Makefile.in
PROTOCC=@PROTOCC@

# grep -P "^PROTOCC" work/POSTGRESQL_SERVERS/12/postgis-3.0.0/postgis/Makefile
PROTOCC=

Error looks like this:

...
x86_64-pc-linux-gnu-cc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -Wno-format-truncation -Wno-stringop-truncation -march=native -pipe -O2 -fPIC -I../liblwgeom -std=gnu99 -march=native -pipe -O2 -fno-math-errno -fno-signed-zeros -I../libpgcommon -I../deps/wagyu -I../deps/uthash/include  -I/usr/x86_64-pc-linux-gnu/include   -I/usr/x86_64-pc-linux-gnu/include/libxml2  -I/usr/x86_64-pc-linux-gnu/include/json-c  -march=native -pipe -O2  -fPIC -DPIC -I. -I./ -I/usr/x86_64-pc-linux-gnu/include/postgresql-12/server -I/usr/x86_64-pc-linux-gnu/include/postgresql-12/internal  -march=native -pipe -O2 -D_GNU_SOURCE   -c -o postgis_libprotobuf.o postgis_libprotobuf.c

Error:
  * In program cave --colour yes perform install --hooks --managed-output --output-exclusivity with-others =dev-db/postgis-3.0.0-r1:0::CleverCloud --destination installed --replacing =dev-db/postgis-3.0.0:0::installed --x-of-y 1 of 1:
  * When installing 'dev-db/postgis-3.0.0-r1:0::CleverCloud' replacing { 'dev-db/postgis-3.0.0:0::installed' }:
  * When running an ebuild command on 'dev-db/postgis-3.0.0-r1:0::CleverCloud':
  * Install failed for 'dev-db/postgis-3.0.0-r1:0::CleverCloud' (paludis::ActionFailedError)

c_out=. vector_tile.proto
x86_64-pc-linux-gnu-cc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -Wno-format-truncation -Wno-stringop-truncation -march=native -pipe -O2 -fPIC -I../liblwgeom -std=gnu99 -march=native -pipe -O2 -fno-math-errno -fno-signed-zeros -I../libpgcommon -I../deps/wagyu -I../deps/uthash/include  -I/usr/x86_64-pc-linux-gnu/include   -I/usr/x86_64-pc-linux-gnu/include/libxml2  -I/usr/x86_64-pc-linux-gnu/include/json-c  -march=native -pipe -O2  -fPIC -DPIC -I. -I./ -I/usr/x86_64-pc-linux-gnu/include/postgresql-12/server -I/usr/x86_64-pc-linux-gnu/include/postgresql-12/internal  -march=native -pipe -O2 -D_GNU_SOURCE   -c -o vector_tile.pb-c.o vector_tile.pb-c.c
make[1]: Leaving directory '/var/tmp/paludis/build/dev-db-postgis-3.0.0-r1/work/POSTGRESQL_SERVERS/12/postgis-3.0.0/postgis'
/bin/sh: vector_tile.proto: command not found
make[1]: [Makefile:218: vector_tile.pb-c.c] Error 127 (ignored)
x86_64-pc-linux-gnu-gcc: error: vector_tile.pb-c.c: No such file or directory
x86_64-pc-linux-gnu-gcc: fatal error: no input files
compilation terminated.
make[1]: *** [<builtin>: vector_tile.pb-c.o] Error 1
make: *** [GNUmakefile:20: all] Error 1

!!! ERROR in dev-db/postgis-3.0.0-r1::CleverCloud:
!!! In /usr/x86_64-pc-linux-gnu/libexec/paludis/utils/exheres-0/emake at line 30
!!! emake returned error 2

!!! Call stack:
!!!    * paludis_die_or_error_func (/usr/x86_64-pc-linux-gnu/libexec/paludis/die_functions.bash:82)
!!!    * main (/usr/x86_64-pc-linux-gnu/libexec/paludis/utils/exheres-0/emake:30)

diefunc: making ebuild PID 4146516 exit with error
die trap: exiting with error.

Failed install to / for dev-db/postgis-3.0.0-r1:0::CleverCloud replacing 3.0.0:0::installed