Unresolved @ArSupportsAtFile@ on Solaris distribution.

While configuring ghc binary distribution on Solaris I've noted that settings file is not correctly generated:

$ cat settings 
[("GCC extra via C opts", " -fwrapv"),
 ("C compiler command", "/usr/sfw/bin/gcc"),
 ("C compiler flags", " "),
 ("ar command", "/usr/xpg4/bin/ar"),
 ("ar flags", "clqs"),
 ("ar supports at file", "@ArSupportsAtFile@"),
 ("touch command", "touch"),
 ("dllwrap command", "/bin/false"),
 ("windres command", "/bin/false"),
 ("perl command", "/usr/bin/perl"),
 ("target os", "OSSolaris2"),
 ("target arch", "ArchX86"),
 ("target word size", "4"),
 ("target has GNU nonexec stack", "True"),
 ("target has .ident directive", "True"),
 ("target has subsections via symbols", "False"),
 ("LLVM llc command", "llc"),
 ("LLVM opt command", "opt")
 ]

Looks like @ArSupportsAtFile@ is not filled with the right value.

Trac metadata

Trac field	Value
Version	7.6.3
Type	Bug
TypeOfFailure	InstallationFailure
Priority	normal
Resolution	Unresolved
Component	Build System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Solaris
Architecture	x86_64 (amd64)