即使启用了cgo也无法从Go加载C文件

I'm currently trying to build Cilium on ARM64/Ubuntu Xenial but the make install command does not work. I am getting the error can't load package: package github.com/cilium/cilium/test/bpf: C source files not allowed when not using cgo or SWIG: bpf-event-test.c unit-test.c and then all the recursive install commands fail. The suprising fact is that I've set CGO_ENABLED=1 and the go compiler doesn't seem to take care of it.

Do you have any ideas ?

Thank you in advance

go version go1.11.1 linux/arm64