ncurses: Recognise linux-gnuabielfv{1,2}

[OPNA2608]

ncurses has a list of GNU-ish targets, for deciding which flags need to be set to get certain POSIX features. linux-gnuabielfv{1,2} fails to match that list, so certain defines don't get set.

This causes the build to fail for such targets, due to wcwidth being gated in the system headers behind an _XOPEN_SOURCE check:

In file included from ../ncurses/./base/lib_addch.c:37:
../ncurses/./base/lib_addch.c: In function 'waddch_literal':
../ncurses/curses.priv.h:1941:28: error: implicit declaration of function 'wcwidth' [-Wimplicit-function-declaration]
 1941 | #define _nc_wacs_width(ch) wcwidth(ch)
      |                            ^~~~~~~
../ncurses/curses.priv.h:1474:25: note: in definition of macro 'if_WIDEC'
 1474 | #define if_WIDEC(code)  code
      |                         ^~~~
../ncurses/./base/lib_addch.c:321:19: note: in expansion of macro '_nc_wacs_width'
  321 |         int len = _nc_wacs_width(CharOf(ch));
      |                   ^~~~~~~~~~~~~~

Fix this issue by adding the pattern linux*gnuabielfv* to the list.

This makes (cross-)compiling ncurses for powerpc64-unknown-linux-gnuabielfv1 work.

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux (cross)
  • powerpc64-linux (ELFv1, native & cross)
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[alyssais]

Upstream?

[OPNA2608]

Will do.

_{^{Gah, more mailing lists…}}

[OPNA2608]

Submitted a report about this to upstream's ML, with a patch that fixes this written against their latest snapshot export: https://lists.gnu.org/archive/html/bug-ncurses/2025-07/msg00040.html

Latest snapshot has some new spots in need of patching that didn't exist in the 6.5 release, so I'll vendor a backported version of the patch without those hunks here.

Edit: Now included in v6_5_20250726: ThomasDickey/ncurses-snapshots@4afb0e7

[alyssais]

Wonderful, thanks! (Please do proactively submit this sort of thing to upstream — the more each distro does that, the less work we all have to do.)

[flokli]

Successfully built pkgsCross.ppc64-elfv{1,2}.ncurses. Thanks!