build from source. ImportError: No module named google.protobuf.descriptor

[sliptonic]

I cloned machinekit-hal and I'm trying to build with CNC using the script

I'm getting the error about the missing python library but can't find the package that provides it.

$ ./scripts/build_with_cnc 

checking for cython... /usr/bin/cython

checking cython version... 0.25.2

checking build toplevel... /home/brad/machinekit-hal

checking installation prefix... run in place

checking for grep... /bin/grep

checking for egrep... /bin/egrep

checking for gcc... gcc

checking whether the C compiler works... yes

checking for C compiler default output file name... a.out

checking for suffix of executables... 

checking whether we are cross compiling... no

checking for suffix of object files... o

checking whether we are using the GNU C compiler... yes

checking whether gcc accepts -g... yes

checking for gcc option to accept ISO C89... none needed

checking for g++... g++

checking whether we are using the GNU C++ compiler... yes

checking whether g++ accepts -g... yes

checking how to run the C preprocessor... gcc -E

checking for objcopy... objcopy

checking for ld... ld

checking build system type... x86_64-unknown-linux-gnu

checking host system type... x86_64-unknown-linux-gnu

checking for pkg-config... pkg-config

checking platform-pc... default enabled for this architecture

checking platform-beaglebone... disabled for this architecture

checking platform-h3... disabled for this architecture

checking platform-chip... disabled for this architecture

checking platform-socfpga... disabled for this architecture

checking platform-raspberry... disabled for this architecture

checking platform-zedboard... disabled for this architecture

checking for uuidgen... /usr/bin/uuidgen

setting unique Machinekit UUID to 4d7eedb6-d462-4fb9-a3ff-f97470e9d67d

checking whether to enable remote operation... local operation on IPC sockets only, zeroconf not used

checking which directory to use for IPC sockets and other transient files... using /tmp for IPC sockets and other transient files

checking whether to build programming examples... not building example programs

checking for proto2js... none

checking whether to build protobuf Javascript bindings... not protobuf Javascript bindings

checking whether to use the common shared memory driver... default is no

checking whether to use inb/outb or ppdev ioctl on the x86 for parport I/O... using defaults: no

checking whether to build the emcweb interface... not building the emcweb interface

checking whether to build unstable development code... not building  development code

checking pkg-config is at least version 0.9.0... yes

checking for CK... no

checking for CZMQ... yes

checking for PROTOBUF... yes

checking for protoc... /usr/bin/protoc

checking python module: google.protobuf.descriptor... Traceback (most recent call last):

  File "<string>", line 1, in <module>

ImportError: No module named google.protobuf.descriptor

no

configure: error: failed to find required module google.protobuf.descriptor

[Michael Brown]

I think you can find the protobuf requirements in following lines:

https://github.com/the-snowwhite/vivado_docker/blob/master/Dockerfile#L70

Best wishes

Michael B