edge_utils.c:1687:52: error: ‘SO_REUSEPORT’ undeclared (first use in this function)

[basitengr]

Hi,
I downloaded git code and compiled on old linode VM machine.

# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 7.8 (wheezy)
Release:        7.8
Codename:       wheezy

# uname -a
Linux asterisk1 4.15.13-x86_64-linode106 #1 SMP Tue Mar 27 14:42:14 UTC 2018 x86_64 GNU/Linux

While compilation i faced following error.

~/n2n# make 
/bin/sh: 1: pkg-config: not found
cc -g3  -Wall -Wshadow -Wpointer-arith -Wmissing-declarations -Wnested-externs   -c n2n.c
cc -g3  -Wall -Wshadow -Wpointer-arith -Wmissing-declarations -Wnested-externs   -c n2n_keyfile.c
cc -g3  -Wall -Wshadow -Wpointer-arith -Wmissing-declarations -Wnested-externs   -c wire.c
cc -g3  -Wall -Wshadow -Wpointer-arith -Wmissing-declarations -Wnested-externs   -c minilzo.c
cc -g3  -Wall -Wshadow -Wpointer-arith -Wmissing-declarations -Wnested-externs   -c twofish.c
cc -g3  -Wall -Wshadow -Wpointer-arith -Wmissing-declarations -Wnested-externs   -c edge_utils.c
edge_utils.c: In function ‘quick_edge_init’:
edge_utils.c:1687:52: error: ‘SO_REUSEPORT’ undeclared (first use in this function)
edge_utils.c:1687:52: note: each undeclared identifier is reported only once for each function it appears in
make: *** [edge_utils.o] Error 1

I am able to compile and run the program by commenting out the lines using ‘SO_REUSEPORT’

~/n2n# grep -r SO_REUSEPORT *
edge.c:  /*  setsockopt(eee.udp_multicast_sock, SOL_SOCKET, SO_REUSEPORT, &enable_reuse, sizeof(enable_reuse)); */
edge_utils.c:  /*  setsockopt(eee.udp_multicast_sock, SOL_SOCKET, SO_REUSEPORT, &enable_reuse, sizeof(enable_reuse)); */

After that make and make install go smoothly.
Can you suggest what the proper resolution?
Is there any limitation in using older kernels?

[cccooo]

win32 and linux< 3.9 do not support SO_REUSEPORT.
see: https://stackoverflow.com/a/14388707/986760

[emanuele-f]

Thank you