gistfile1.txt

### What version of rules_go are you using?

0.18.1

### What version of gazelle are you using?

0.15.0

### What version of Bazel are you using?

0.24.0

### Does this issue reproduce with the latest releases of all the above?



### What operating system and processor architecture are you using?

Ubuntu Linux 16.04 in a docker container on OSX  (cpuinfo shows i7-4770HQ, flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht pbe syscall nx pdpe1gb lm constant_tsc rep_good nopl xtopology nonstop_tsc pni pclmulqdq dtes64 ds_cpl ssse3 sdbg fma cx16 xtpr pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm kaiser fsgsbase bmi1 avx2 bmi2 erms xsaveopt arat)

### Any other potentially useful information about your toolchain?

I have tested my repository on my development workstation (OSX 10.14.3, Bazel 0.21.0) and had no problems. 

### What did you do?

I ran `bazel build ...` on a simple test repository: https://gitlab.com/gauntletwizard/bazel-go

### What did you expect to see?

I expected builds to complete 

### What did you see instead?

SUBCOMMAND: # @io_bazel_rules_go//:stdlib [action 'GoStdlib external/io_bazel_rules_go/linux_amd64_pure_stripped/stdlib%/pkg']
(cd /root/.cache/bazel/_bazel_root/59780dcb742d55c0fe9af6a012f9b672/execroot/__main__ && \
  exec env - \
    CC=/usr/bin/gcc \
    CGO_CFLAGS='-U_FORTIFY_SOURCE -fstack-protector -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer -fno-canonical-system-headers -Wno-builtin-macro-redefined -D__DATE__="redacted" -D__TIMESTAMP__="redacted" -D__TIME__="redacted"' \
    CGO_ENABLED=0 \
    CGO_LDFLAGS='-fuse-ld=gold -Wl,-no-as-needed -Wl,-z,relro,-z,now -B/usr/bin -pass-exit-codes -lstdc++ -lm' \
    GOARCH=amd64 \
    GOOS=linux \
    GOROOT=external/go_sdk \
    GOROOT_FINAL=GOROOT \
    PATH=/usr/bin:/bin \
  bazel-out/host/bin/external/go_sdk/builder stdlib -sdk external/go_sdk -installsuffix linux_amd64 -out bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/linux_amd64_pure_stripped/stdlib%)
ERROR: /root/.cache/bazel/_bazel_root/59780dcb742d55c0fe9af6a012f9b672/external/io_bazel_rules_go/BUILD.bazel:8:1: GoStdlib external/io_bazel_rules_go/linux_amd64_pure_stripped/stdlib%/pkg failed (Exit 1)
missing $GOPATH
stdlib: error running subcommand: exit status 1