[nix-shell:~/go/go-gtkkk]$ go env
warning: GOPATH set to GOROOT (/nix/store/1qnxk44bfdl7g88zq9apngs33gvr060q-go-1.9.2/share/go) has no effect
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/nix/store/1qnxk44bfdl7g88zq9apngs33gvr060q-go-1.9.2/share/go"
GORACE=""
GOROOT="/nix/store/1qnxk44bfdl7g88zq9apngs33gvr060q-go-1.9.2/share/go"
GOTOOLDIR="/nix/store/1qnxk44bfdl7g88zq9apngs33gvr060q-go-1.9.2/share/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/run/user/1000/go-build220786401=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"