prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Fix neovim install on M1
  With #29228 and #29229 in, the `spack install neovim` fails with:
  ```
       1022    undef: _tigetstr
       1023    undef: _cur_term
       1024    undef: _setupterm
    >> 1025    Undefined symbols for architecture arm64:
       1026      "_tigetstr", referenced from:
       1027          _try_load_terminfo_key in libtermkey.a(driver-ti.o)
       1028      "_cur_term", referenced from:
       1029          _load_terminfo in libtermkey.a(driver-ti.o)
       1030      "_setupterm", referenced from:
       1031          _new_driver in libtermkey.a(driver-ti.o)
       1032          _load_terminfo in libtermkey.a(driver-ti.o)
       1033    ld: symbol(s) not found for architecture arm64
  ```
  While linking the `nvim` executable. These symbols seem to be coming from `ncurses`, but linking `ncurses` explicitly didn't seem to fix it. However, the current PR fixes it. One must turn off `termlib` in `ncurses` and then one must explicitly link it. Then `nvim` builds just fine. I am opening this PR as a Draft, because the `+termlib` seems hardwired in `lua`, so I don't know how to fix this properly. Also just adding `ncurses` in the cmake for `neovim` doesn't feel right, one should explicitly depend on `ncurses` and then find it using cmake. I don't have time to work on that. But this PR might be helpful to others to finish this work. Either way, neovim seems to work fine now.
  
  </issue>
  <code>
  [start of var/spack/repos/builtin/packages/libtermkey/package.py]
  1 # Copyright 2013-2022 Lawrence Livermore National Security, LLC and other
  2 # Spack Project Developers. See the top-level COPYRIGHT file for details.
  3 #
  4 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
  5 
  6 from spack import *
  7 
  8 
  9 class Libtermkey(Package):
  10     """Easy keyboard entry processing for terminal programs"""
  11     homepage = "http://www.leonerd.org.uk/code/libtermkey/"
  12     url      = "http://www.leonerd.org.uk/code/libtermkey/libtermkey-0.18.tar.gz"
  13 
  14     version('0.22', sha256='6945bd3c4aaa83da83d80a045c5563da4edd7d0374c62c0d35aec09eb3014600')
  15     version('0.18', sha256='239746de41c845af52bb3c14055558f743292dd6c24ac26c2d6567a5a6093926')
  16     version('0.17', sha256='68949364ed5eaad857b3dea10071cde74b00b9f236dfbb702169f246c3cef389')
  17     version('0.16', sha256='6c8136efa5d0b3277014a5d4519ea81190079c82656b7db1655a1bd147326a70')
  18     version('0.15b', sha256='6825422c6297e4f81b2c48962b4512585ca8a50bf31f24b3234a1be71a9d7a6e')
  19     version('0.14', sha256='3d114d4509499b80a583ea39cd35f18268aacf4a7bbf56c142cd032632005c79')
  20 
  21     depends_on('libtool', type='build')
  22     depends_on('ncurses')
  23     depends_on('pkgconfig')
  24 
  25     def install(self, spec, prefix):
  26         make()
  27         make("install", "PREFIX=" + prefix)
  28
  [end of var/spack/repos/builtin/packages/libtermkey/package.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/var/spack/repos/builtin/packages/libtermkey/package.py b/var/spack/repos/builtin/packages/libtermkey/package.py
  --- a/var/spack/repos/builtin/packages/libtermkey/package.py
  +++ b/var/spack/repos/builtin/packages/libtermkey/package.py
  @@ -19,7 +19,7 @@
       version('0.14', sha256='3d114d4509499b80a583ea39cd35f18268aacf4a7bbf56c142cd032632005c79')
   
       depends_on('libtool', type='build')
  -    depends_on('ncurses')
  +    depends_on('unibilium')
       depends_on('pkgconfig')
   
       def install(self, spec, prefix):
  
verification_info: {"golden_diff": "diff --git a/var/spack/repos/builtin/packages/libtermkey/package.py b/var/spack/repos/builtin/packages/libtermkey/package.py\n--- a/var/spack/repos/builtin/packages/libtermkey/package.py\n+++ b/var/spack/repos/builtin/packages/libtermkey/package.py\n@@ -19,7 +19,7 @@\n     version('0.14', sha256='3d114d4509499b80a583ea39cd35f18268aacf4a7bbf56c142cd032632005c79')\n \n     depends_on('libtool', type='build')\n-    depends_on('ncurses')\n+    depends_on('unibilium')\n     depends_on('pkgconfig')\n \n     def install(self, spec, prefix):\n", "issue": "Fix neovim install on M1\nWith #29228 and #29229 in, the `spack install neovim` fails with:\r\n```\r\n     1022    undef: _tigetstr\r\n     1023    undef: _cur_term\r\n     1024    undef: _setupterm\r\n  >> 1025    Undefined symbols for architecture arm64:\r\n     1026      \"_tigetstr\", referenced from:\r\n     1027          _try_load_terminfo_key in libtermkey.a(driver-ti.o)\r\n     1028      \"_cur_term\", referenced from:\r\n     1029          _load_terminfo in libtermkey.a(driver-ti.o)\r\n     1030      \"_setupterm\", referenced from:\r\n     1031          _new_driver in libtermkey.a(driver-ti.o)\r\n     1032          _load_terminfo in libtermkey.a(driver-ti.o)\r\n     1033    ld: symbol(s) not found for architecture arm64\r\n```\r\nWhile linking the `nvim` executable. These symbols seem to be coming from `ncurses`, but linking `ncurses` explicitly didn't seem to fix it. However, the current PR fixes it. One must turn off `termlib` in `ncurses` and then one must explicitly link it. Then `nvim` builds just fine. I am opening this PR as a Draft, because the `+termlib` seems hardwired in `lua`, so I don't know how to fix this properly. Also just adding `ncurses` in the cmake for `neovim` doesn't feel right, one should explicitly depend on `ncurses` and then find it using cmake. I don't have time to work on that. But this PR might be helpful to others to finish this work. Either way, neovim seems to work fine now.\n", "before_files": [{"content": "# Copyright 2013-2022 Lawrence Livermore National Security, LLC and other\n# Spack Project Developers. See the top-level COPYRIGHT file for details.\n#\n# SPDX-License-Identifier: (Apache-2.0 OR MIT)\n\nfrom spack import *\n\n\nclass Libtermkey(Package):\n    \"\"\"Easy keyboard entry processing for terminal programs\"\"\"\n    homepage = \"http://www.leonerd.org.uk/code/libtermkey/\"\n    url      = \"http://www.leonerd.org.uk/code/libtermkey/libtermkey-0.18.tar.gz\"\n\n    version('0.22', sha256='6945bd3c4aaa83da83d80a045c5563da4edd7d0374c62c0d35aec09eb3014600')\n    version('0.18', sha256='239746de41c845af52bb3c14055558f743292dd6c24ac26c2d6567a5a6093926')\n    version('0.17', sha256='68949364ed5eaad857b3dea10071cde74b00b9f236dfbb702169f246c3cef389')\n    version('0.16', sha256='6c8136efa5d0b3277014a5d4519ea81190079c82656b7db1655a1bd147326a70')\n    version('0.15b', sha256='6825422c6297e4f81b2c48962b4512585ca8a50bf31f24b3234a1be71a9d7a6e')\n    version('0.14', sha256='3d114d4509499b80a583ea39cd35f18268aacf4a7bbf56c142cd032632005c79')\n\n    depends_on('libtool', type='build')\n    depends_on('ncurses')\n    depends_on('pkgconfig')\n\n    def install(self, spec, prefix):\n        make()\n        make(\"install\", \"PREFIX=\" + prefix)\n", "path": "var/spack/repos/builtin/packages/libtermkey/package.py"}]}