Hadrian build fails on FreeBSD

Hi,

I've tried a hadrian/build.sh -j on my FreeBSD machine and got greeted by a rather nasty looking error.

Up to date
shakeArgsWith   0.000s    0%
Function shake  0.275s   80%  =========================
Database read   0.000s    0%
With database   0.000s    0%
Running rules   0.065s   19%  =====
Total           0.340s  100%
Error when running Shake build system:
* OracleQ (KeyValue ("hadrian/cfg/system.config","host-os"))
* hadrian/cfg/system.config
* hadrian/cfg/system.config settings mk/config.h compiler/ghc.cabal rts/rts.cabal
Configuration file hadrian/cfg/system.config is missing.
Run the configure script manually or let Hadrian run it automatically by passing the flag --configure.
CallStack (from HasCallStack):
  error, called at src/Rules/Configure.hs:25:13 in main:Rules.Configure

I've tried this with commit 1a3b9bd0b674ad16a41b942c738b8f34564bcd8d and my current system is FreeBSD lain 12.0-BETA3 FreeBSD 12.0-BETA3 r340097 GENERIC amd64.

Building GHC with the old build system worked perfectly fine though.

Trac metadata

Trac field	Value
Version	8.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System (Hadrian)
Test case
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