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Hi guys, following the guide here:
https://goautodial.org/projects/goautodialce/wiki/Version_4_How_To_Install_Goautodial_From_Scratch_using_CentOS_7X

I can't recompile rtpengine, get the following messages. Trying to install in an CentOS7 AWS EC2 instance

root@ip-172-31-15-15 ngcp-rtpengine-6.4.0.0-1.el7]# make
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
make -C /lib/modules/3.10.0-862.14.4.el7.x86_64/build M=/usr/src/ngcp-rtpengine-6.4.0.0-1.el7 O=/lib/modules/3.10.0-862.14.4.el7.x86_64/build modules
make¹: Entering directory `/usr/src/kernels/3.10.0-862.14.4.el7.x86_64'
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
CC [M] /usr/src/ngcp-rtpengine-6.4.0.0-1.el7/xt_RTPENGINE.o
Building modules, stage 2.
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
MODPOST 1 modules
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
CC /usr/src/ngcp-rtpengine-6.4.0.0-1.el7/xt_RTPENGINE.mod.o
LD [M] /usr/src/ngcp-rtpengine-6.4.0.0-1.el7/xt_RTPENGINE.ko
make<sup>1</sup>: Leaving directory `/usr/src/kernels/3.10.0-862.14.4.el7.x86_64'
[root@ip-172-31-15-15 ngcp-rtpengine-6.4.0.0-1.el7]# make install
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
make: Nothing to be done for `install'.

If I try to start rtpengine I get:

rtpengine[10184]: INFO: Generating new DTLS certificate
 rtpengine[10184]: ERR: FAILED TO CREATE KERNEL TABLE 0 (No such file or directory), KERNEL FORWARDING DISABLED
 rtpengine[10184]: CRIT: Userspace fallback disallowed - exiting
 ngcp-rtpengine[10175]: Starting rtpengine: [1542431269.470232] ERR: FAILED TO CREATE KERNEL TABLE 0 (No such file or directory), KE...G DISABLED
 ngcp-rtpengine[10175]: [1542431269.470248] CRIT: Userspace fallback disallowed - exiting
 ngcp-rtpengine[10175]: [FAILED]

Stuck! Please advise :)