[Bug 51926] New: Cannot build wine 6.20 on Slackware Linux 14.2

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51926

Bug ID: 51926
           Summary: Cannot build wine 6.20 on Slackware Linux 14.2
           Product: Packaging
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-packages
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
      Distribution: ---

Created attachment 70894
  --> https://bugs.winehq.org/attachment.cgi?id=70894
Output of the configure and make commands

I'm trying to package Wine 6.20 for Slackware 14.2 (Stable).
Glibc version is 2.23.
Gcc version is 5.5.
Both the 32 and 64 bit versions are affected.
No such problem when building release 6.19.
The build process fails rather soon when compiling file
dlls/ntdll/unix/loader.c. From what I understand, the issue is related to the
__WAIT_INT (status) macro defined in header file /usr/include/sys/wait.h (Part
of glibc).
The macro is expanded into:
__WAIT_INT (status): (__extension__ (((union { __typeof(status) ; int __i; }) {
. = (status) }).__i))
but the compiler does not recognize it as a valid declaration and issues a
warning resulting in the error reported in the attached wine_make.log file.
The output from the configure command is included in the second attached file:
wine_configure.log

Any help is appreciated.

Thanks in advance
Simone