From a0346c913fb5ba196bcbeae1a253f03b994e04ec Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 13 Nov 2024 17:14:35 -0500
Subject: [PATCH 1/7] build/bin/sage-guess-package-system: drop cygwin case

---
 build/bin/sage-guess-package-system | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/build/bin/sage-guess-package-system b/build/bin/sage-guess-package-system
index 8e679c2eac9..33a7e2ad587 100755
--- a/build/bin/sage-guess-package-system
+++ b/build/bin/sage-guess-package-system
@@ -32,12 +32,5 @@ elif xbps-install --version > /dev/null 2>&1; then
 elif pkg -v > /dev/null 2>&1; then
     echo freebsd
 else
-    case `uname -s` in
-        CYGWIN*)
-            echo cygwin
-            ;;
-        *)
-            echo unknown
-            ;;
-    esac
+    echo unknown
 fi

From 92300f8afb2d8cb8ff41620caadc1ed7cb25e744 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 13 Nov 2024 17:15:12 -0500
Subject: [PATCH 2/7] build/bin/sage-print-system-package-command: drop cygwin
 cases

---
 build/bin/sage-print-system-package-command | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/build/bin/sage-print-system-package-command b/build/bin/sage-print-system-package-command
index daf61c48c09..5af7740e229 100755
--- a/build/bin/sage-print-system-package-command
+++ b/build/bin/sage-print-system-package-command
@@ -182,12 +182,6 @@ case $system:$command in
     slackware*:install)
         [ -n "$system_packages" ] && print_shell_command ${SUDO}slackpkg install $system_packages
         ;;
-    cygwin*:update)
-        print_comment "first install apt-cyg from https://github.com/transcode-open/apt-cyg"
-        ;;
-    cygwin*:install)
-        [ -n "$system_packages" ] && print_shell_command apt-cyg install $system_packages
-        ;;
     freebsd*:install)
         [ -n "$system_packages" ] && print_shell_command ${SUDO}pkg install $system_packages
         ;;

From 4c3ea02d4fab2601313023d3dec1551a5a200d4e Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 13 Nov 2024 17:15:56 -0500
Subject: [PATCH 3/7] build/bin/sage-spkg-info: drop cygwin case

---
 build/bin/sage-spkg-info | 1 -
 1 file changed, 1 deletion(-)

diff --git a/build/bin/sage-spkg-info b/build/bin/sage-spkg-info
index 29d833a29bf..09b4ea8c1be 100755
--- a/build/bin/sage-spkg-info
+++ b/build/bin/sage-spkg-info
@@ -85,7 +85,6 @@ for system in $systems; do
             alpine)     tab "Alpine";;
             arch)       tab "Arch Linux";;
             conda)      tab "conda-forge";;
-            cygwin)     tab "Cygwin";;
             debian)     tab "Debian/Ubuntu";;
             fedora)     tab "Fedora/Redhat/CentOS";;
             freebsd)    tab "FreeBSD";;

From 8d96a6a4f57c5f526ceb05a3f57568d237fbd1cd Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 13 Nov 2024 17:16:55 -0500
Subject: [PATCH 4/7] build/pkgs: delete all cygwin.txt files

---
 build/pkgs/4ti2/distros/cygwin.txt            |  2 --
 build/pkgs/_bootstrap/distros/cygwin.txt      |  4 ---
 build/pkgs/_develop/distros/cygwin.txt        |  1 -
 build/pkgs/_prereq/distros/cygwin.txt         | 28 -------------------
 build/pkgs/_python3.10/distros/cygwin.txt     |  1 -
 build/pkgs/_python3.11/distros/cygwin.txt     |  1 -
 build/pkgs/_python3.12/distros/cygwin.txt     |  1 -
 build/pkgs/_python3.9/distros/cygwin.txt      |  1 -
 build/pkgs/boost_cropped/distros/cygwin.txt   |  1 -
 build/pkgs/bzip2/distros/cygwin.txt           |  2 --
 build/pkgs/cddlib/distros/cygwin.txt          |  2 --
 build/pkgs/cmake/distros/cygwin.txt           |  1 -
 build/pkgs/curl/distros/cygwin.txt            |  2 --
 build/pkgs/flint/distros/cygwin.txt           |  1 -
 build/pkgs/freetype/distros/cygwin.txt        |  1 -
 build/pkgs/gc/distros/cygwin.txt              |  1 -
 build/pkgs/gcc/distros/cygwin.txt             |  3 --
 build/pkgs/gengetopt/distros/cygwin.txt       |  1 -
 build/pkgs/gfortran/distros/cygwin.txt        |  1 -
 build/pkgs/git/distros/cygwin.txt             |  1 -
 build/pkgs/glpk/distros/cygwin.txt            |  2 --
 build/pkgs/gmp/distros/cygwin.txt             |  1 -
 build/pkgs/graphviz/distros/cygwin.txt        |  1 -
 build/pkgs/gsl/distros/cygwin.txt             |  1 -
 build/pkgs/iconv/distros/cygwin.txt           |  1 -
 build/pkgs/imagemagick/distros/cygwin.txt     |  1 -
 build/pkgs/info/distros/cygwin.txt            |  1 -
 build/pkgs/isl/distros/cygwin.txt             |  1 -
 build/pkgs/libatomic_ops/distros/cygwin.txt   |  1 -
 build/pkgs/libffi/distros/cygwin.txt          |  1 -
 build/pkgs/libgd/distros/cygwin.txt           |  1 -
 build/pkgs/libgraphviz/distros/cygwin.txt     |  1 -
 build/pkgs/liblzma/distros/cygwin.txt         |  2 --
 build/pkgs/libxml2/distros/cygwin.txt         |  1 -
 build/pkgs/llvm/distros/cygwin.txt            |  1 -
 build/pkgs/maxima/distros/cygwin.txt          |  1 -
 build/pkgs/mpc/distros/cygwin.txt             |  1 -
 build/pkgs/mpfr/distros/cygwin.txt            |  1 -
 build/pkgs/ncurses/distros/cygwin.txt         |  1 -
 build/pkgs/ninja_build/distros/cygwin.txt     |  1 -
 build/pkgs/ntl/distros/cygwin.txt             |  1 -
 build/pkgs/openblas/distros/cygwin.txt        |  2 --
 build/pkgs/openssl/distros/cygwin.txt         |  1 -
 build/pkgs/patch/distros/cygwin.txt           |  1 -
 .../perl_term_readline_gnu/distros/cygwin.txt |  1 -
 build/pkgs/python3/distros/cygwin.txt         |  5 ----
 build/pkgs/qhull/distros/cygwin.txt           |  1 -
 build/pkgs/r/distros/cygwin.txt               |  2 --
 build/pkgs/readline/distros/cygwin.txt        |  1 -
 build/pkgs/sbcl/distros/cygwin.txt            |  1 -
 build/pkgs/singular/distros/cygwin.txt        |  2 --
 build/pkgs/sqlite/distros/cygwin.txt          |  2 --
 build/pkgs/suitesparse/distros/cygwin.txt     |  1 -
 build/pkgs/texlive/distros/cygwin.txt         |  1 -
 build/pkgs/texlive_luatex/distros/cygwin.txt  |  1 -
 build/pkgs/xz/distros/cygwin.txt              |  1 -
 build/pkgs/zeromq/distros/cygwin.txt          |  1 -
 build/pkgs/zlib/distros/cygwin.txt            |  1 -
 58 files changed, 104 deletions(-)
 delete mode 100644 build/pkgs/4ti2/distros/cygwin.txt
 delete mode 100644 build/pkgs/_bootstrap/distros/cygwin.txt
 delete mode 100644 build/pkgs/_develop/distros/cygwin.txt
 delete mode 100644 build/pkgs/_prereq/distros/cygwin.txt
 delete mode 100644 build/pkgs/_python3.10/distros/cygwin.txt
 delete mode 100644 build/pkgs/_python3.11/distros/cygwin.txt
 delete mode 100644 build/pkgs/_python3.12/distros/cygwin.txt
 delete mode 100644 build/pkgs/_python3.9/distros/cygwin.txt
 delete mode 100644 build/pkgs/boost_cropped/distros/cygwin.txt
 delete mode 100644 build/pkgs/bzip2/distros/cygwin.txt
 delete mode 100644 build/pkgs/cddlib/distros/cygwin.txt
 delete mode 100644 build/pkgs/cmake/distros/cygwin.txt
 delete mode 100644 build/pkgs/curl/distros/cygwin.txt
 delete mode 100644 build/pkgs/flint/distros/cygwin.txt
 delete mode 100644 build/pkgs/freetype/distros/cygwin.txt
 delete mode 100644 build/pkgs/gc/distros/cygwin.txt
 delete mode 100644 build/pkgs/gcc/distros/cygwin.txt
 delete mode 100644 build/pkgs/gengetopt/distros/cygwin.txt
 delete mode 100644 build/pkgs/gfortran/distros/cygwin.txt
 delete mode 100644 build/pkgs/git/distros/cygwin.txt
 delete mode 100644 build/pkgs/glpk/distros/cygwin.txt
 delete mode 100644 build/pkgs/gmp/distros/cygwin.txt
 delete mode 100644 build/pkgs/graphviz/distros/cygwin.txt
 delete mode 100644 build/pkgs/gsl/distros/cygwin.txt
 delete mode 100644 build/pkgs/iconv/distros/cygwin.txt
 delete mode 100644 build/pkgs/imagemagick/distros/cygwin.txt
 delete mode 100644 build/pkgs/info/distros/cygwin.txt
 delete mode 100644 build/pkgs/isl/distros/cygwin.txt
 delete mode 100644 build/pkgs/libatomic_ops/distros/cygwin.txt
 delete mode 100644 build/pkgs/libffi/distros/cygwin.txt
 delete mode 100644 build/pkgs/libgd/distros/cygwin.txt
 delete mode 100644 build/pkgs/libgraphviz/distros/cygwin.txt
 delete mode 100644 build/pkgs/liblzma/distros/cygwin.txt
 delete mode 100644 build/pkgs/libxml2/distros/cygwin.txt
 delete mode 100644 build/pkgs/llvm/distros/cygwin.txt
 delete mode 100644 build/pkgs/maxima/distros/cygwin.txt
 delete mode 100644 build/pkgs/mpc/distros/cygwin.txt
 delete mode 100644 build/pkgs/mpfr/distros/cygwin.txt
 delete mode 100644 build/pkgs/ncurses/distros/cygwin.txt
 delete mode 100644 build/pkgs/ninja_build/distros/cygwin.txt
 delete mode 100644 build/pkgs/ntl/distros/cygwin.txt
 delete mode 100644 build/pkgs/openblas/distros/cygwin.txt
 delete mode 100644 build/pkgs/openssl/distros/cygwin.txt
 delete mode 100644 build/pkgs/patch/distros/cygwin.txt
 delete mode 100644 build/pkgs/perl_term_readline_gnu/distros/cygwin.txt
 delete mode 100644 build/pkgs/python3/distros/cygwin.txt
 delete mode 100644 build/pkgs/qhull/distros/cygwin.txt
 delete mode 100644 build/pkgs/r/distros/cygwin.txt
 delete mode 100644 build/pkgs/readline/distros/cygwin.txt
 delete mode 100644 build/pkgs/sbcl/distros/cygwin.txt
 delete mode 100644 build/pkgs/singular/distros/cygwin.txt
 delete mode 100644 build/pkgs/sqlite/distros/cygwin.txt
 delete mode 100644 build/pkgs/suitesparse/distros/cygwin.txt
 delete mode 100644 build/pkgs/texlive/distros/cygwin.txt
 delete mode 100644 build/pkgs/texlive_luatex/distros/cygwin.txt
 delete mode 100644 build/pkgs/xz/distros/cygwin.txt
 delete mode 100644 build/pkgs/zeromq/distros/cygwin.txt
 delete mode 100644 build/pkgs/zlib/distros/cygwin.txt

diff --git a/build/pkgs/4ti2/distros/cygwin.txt b/build/pkgs/4ti2/distros/cygwin.txt
deleted file mode 100644
index fab3a09f46e..00000000000
--- a/build/pkgs/4ti2/distros/cygwin.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-lib4ti2_0
-lib4ti2-devel
diff --git a/build/pkgs/_bootstrap/distros/cygwin.txt b/build/pkgs/_bootstrap/distros/cygwin.txt
deleted file mode 100644
index bde788ee5d9..00000000000
--- a/build/pkgs/_bootstrap/distros/cygwin.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-# Packages needed for ./bootstrap
-autoconf
-automake
-libtool
diff --git a/build/pkgs/_develop/distros/cygwin.txt b/build/pkgs/_develop/distros/cygwin.txt
deleted file mode 100644
index 239772ed91d..00000000000
--- a/build/pkgs/_develop/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-gnupg2
diff --git a/build/pkgs/_prereq/distros/cygwin.txt b/build/pkgs/_prereq/distros/cygwin.txt
deleted file mode 100644
index 7a05e1aaa54..00000000000
--- a/build/pkgs/_prereq/distros/cygwin.txt
+++ /dev/null
@@ -1,28 +0,0 @@
-# This file, build/pkgs/_prereq/distros/cygwin.txt, contains names of
-# Cygwin packages needed for installation of Sage from source.
-#
-# In addition, the files build/pkgs/SPKG/distros/cygwin.txt contain
-# the names of packages that provide the equivalent of SPKG.
-#
-# One package per line. No need to escape special characters.
-# Everything on a line after a # character is ignored.
-#
-binutils
-make
-m4
-# a system python is needed for downloading the sage packages, https://github.com/sagemath/sage/issues/29090
-python39-urllib3
-python39
-perl
-perl-ExtUtils-MakeMaker
-tar
-gcc-core
-gcc-g++
-# Needed according to embray at https://github.com/sagemath/sage/issues/26964:
-# The need for which comes [...] from MPIR's configure script
-findutils
-which
-# For python3 build
-libcrypt-devel
-# For R build
-libiconv-devel
diff --git a/build/pkgs/_python3.10/distros/cygwin.txt b/build/pkgs/_python3.10/distros/cygwin.txt
deleted file mode 100644
index 92826c681b4..00000000000
--- a/build/pkgs/_python3.10/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-python310
diff --git a/build/pkgs/_python3.11/distros/cygwin.txt b/build/pkgs/_python3.11/distros/cygwin.txt
deleted file mode 100644
index 1d66f45569a..00000000000
--- a/build/pkgs/_python3.11/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-python311
diff --git a/build/pkgs/_python3.12/distros/cygwin.txt b/build/pkgs/_python3.12/distros/cygwin.txt
deleted file mode 100644
index a1bf1c64c82..00000000000
--- a/build/pkgs/_python3.12/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-python312
diff --git a/build/pkgs/_python3.9/distros/cygwin.txt b/build/pkgs/_python3.9/distros/cygwin.txt
deleted file mode 100644
index 6a2d05c5edb..00000000000
--- a/build/pkgs/_python3.9/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-python39
diff --git a/build/pkgs/boost_cropped/distros/cygwin.txt b/build/pkgs/boost_cropped/distros/cygwin.txt
deleted file mode 100644
index 444ab77a410..00000000000
--- a/build/pkgs/boost_cropped/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libboost-devel
diff --git a/build/pkgs/bzip2/distros/cygwin.txt b/build/pkgs/bzip2/distros/cygwin.txt
deleted file mode 100644
index 8ef7f4d0734..00000000000
--- a/build/pkgs/bzip2/distros/cygwin.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-bzip2
-libbz2-devel
diff --git a/build/pkgs/cddlib/distros/cygwin.txt b/build/pkgs/cddlib/distros/cygwin.txt
deleted file mode 100644
index d406d903210..00000000000
--- a/build/pkgs/cddlib/distros/cygwin.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-cddlib-devel
-cddlib-tools
diff --git a/build/pkgs/cmake/distros/cygwin.txt b/build/pkgs/cmake/distros/cygwin.txt
deleted file mode 100644
index a3ea3e4380f..00000000000
--- a/build/pkgs/cmake/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-cmake
diff --git a/build/pkgs/curl/distros/cygwin.txt b/build/pkgs/curl/distros/cygwin.txt
deleted file mode 100644
index 26bfd4d1186..00000000000
--- a/build/pkgs/curl/distros/cygwin.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-libcurl-devel
-curl
diff --git a/build/pkgs/flint/distros/cygwin.txt b/build/pkgs/flint/distros/cygwin.txt
deleted file mode 100644
index cf5b84dbc05..00000000000
--- a/build/pkgs/flint/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libflint-devel
diff --git a/build/pkgs/freetype/distros/cygwin.txt b/build/pkgs/freetype/distros/cygwin.txt
deleted file mode 100644
index efdffca75b2..00000000000
--- a/build/pkgs/freetype/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libfreetype-devel
diff --git a/build/pkgs/gc/distros/cygwin.txt b/build/pkgs/gc/distros/cygwin.txt
deleted file mode 100644
index 3d9787221be..00000000000
--- a/build/pkgs/gc/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libgc-devel
diff --git a/build/pkgs/gcc/distros/cygwin.txt b/build/pkgs/gcc/distros/cygwin.txt
deleted file mode 100644
index dde4bb418b6..00000000000
--- a/build/pkgs/gcc/distros/cygwin.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-gcc-core
-gcc-g++
-gcc-fortran
diff --git a/build/pkgs/gengetopt/distros/cygwin.txt b/build/pkgs/gengetopt/distros/cygwin.txt
deleted file mode 100644
index 2865264cd70..00000000000
--- a/build/pkgs/gengetopt/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-gengetopt
diff --git a/build/pkgs/gfortran/distros/cygwin.txt b/build/pkgs/gfortran/distros/cygwin.txt
deleted file mode 100644
index 8f962328b1e..00000000000
--- a/build/pkgs/gfortran/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-gcc-fortran
diff --git a/build/pkgs/git/distros/cygwin.txt b/build/pkgs/git/distros/cygwin.txt
deleted file mode 100644
index 5664e303b5d..00000000000
--- a/build/pkgs/git/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-git
diff --git a/build/pkgs/glpk/distros/cygwin.txt b/build/pkgs/glpk/distros/cygwin.txt
deleted file mode 100644
index 0fbb959079e..00000000000
--- a/build/pkgs/glpk/distros/cygwin.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-glpk
-libglpk-devel
diff --git a/build/pkgs/gmp/distros/cygwin.txt b/build/pkgs/gmp/distros/cygwin.txt
deleted file mode 100644
index bde3aa97bd3..00000000000
--- a/build/pkgs/gmp/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libgmp-devel
diff --git a/build/pkgs/graphviz/distros/cygwin.txt b/build/pkgs/graphviz/distros/cygwin.txt
deleted file mode 100644
index 4d95609306f..00000000000
--- a/build/pkgs/graphviz/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-graphviz
diff --git a/build/pkgs/gsl/distros/cygwin.txt b/build/pkgs/gsl/distros/cygwin.txt
deleted file mode 100644
index 3f55673dfe6..00000000000
--- a/build/pkgs/gsl/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libgsl-devel
diff --git a/build/pkgs/iconv/distros/cygwin.txt b/build/pkgs/iconv/distros/cygwin.txt
deleted file mode 100644
index df78e31976a..00000000000
--- a/build/pkgs/iconv/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libiconv-devel
diff --git a/build/pkgs/imagemagick/distros/cygwin.txt b/build/pkgs/imagemagick/distros/cygwin.txt
deleted file mode 100644
index 7a33d03ff73..00000000000
--- a/build/pkgs/imagemagick/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-ImageMagick
diff --git a/build/pkgs/info/distros/cygwin.txt b/build/pkgs/info/distros/cygwin.txt
deleted file mode 100644
index 55021245387..00000000000
--- a/build/pkgs/info/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-info
diff --git a/build/pkgs/isl/distros/cygwin.txt b/build/pkgs/isl/distros/cygwin.txt
deleted file mode 100644
index a922268ab95..00000000000
--- a/build/pkgs/isl/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libisl-devel
diff --git a/build/pkgs/libatomic_ops/distros/cygwin.txt b/build/pkgs/libatomic_ops/distros/cygwin.txt
deleted file mode 100644
index 56dbd90c363..00000000000
--- a/build/pkgs/libatomic_ops/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libatomic_ops-devel
diff --git a/build/pkgs/libffi/distros/cygwin.txt b/build/pkgs/libffi/distros/cygwin.txt
deleted file mode 100644
index 31d794ff28d..00000000000
--- a/build/pkgs/libffi/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libffi-devel
diff --git a/build/pkgs/libgd/distros/cygwin.txt b/build/pkgs/libgd/distros/cygwin.txt
deleted file mode 100644
index 3094bd88c2e..00000000000
--- a/build/pkgs/libgd/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libgd-devel
diff --git a/build/pkgs/libgraphviz/distros/cygwin.txt b/build/pkgs/libgraphviz/distros/cygwin.txt
deleted file mode 100644
index 4d95609306f..00000000000
--- a/build/pkgs/libgraphviz/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-graphviz
diff --git a/build/pkgs/liblzma/distros/cygwin.txt b/build/pkgs/liblzma/distros/cygwin.txt
deleted file mode 100644
index c5fa156f8a0..00000000000
--- a/build/pkgs/liblzma/distros/cygwin.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-xz
-liblzma-devel
diff --git a/build/pkgs/libxml2/distros/cygwin.txt b/build/pkgs/libxml2/distros/cygwin.txt
deleted file mode 100644
index 313ee711738..00000000000
--- a/build/pkgs/libxml2/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libxml2-devel
diff --git a/build/pkgs/llvm/distros/cygwin.txt b/build/pkgs/llvm/distros/cygwin.txt
deleted file mode 100644
index e671fa21003..00000000000
--- a/build/pkgs/llvm/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-clang
diff --git a/build/pkgs/maxima/distros/cygwin.txt b/build/pkgs/maxima/distros/cygwin.txt
deleted file mode 100644
index f5fe3fdc6cb..00000000000
--- a/build/pkgs/maxima/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-maxima
diff --git a/build/pkgs/mpc/distros/cygwin.txt b/build/pkgs/mpc/distros/cygwin.txt
deleted file mode 100644
index 279a55fdb8b..00000000000
--- a/build/pkgs/mpc/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libmpc-devel
diff --git a/build/pkgs/mpfr/distros/cygwin.txt b/build/pkgs/mpfr/distros/cygwin.txt
deleted file mode 100644
index e02bb1bdbb1..00000000000
--- a/build/pkgs/mpfr/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libmpfr-devel
diff --git a/build/pkgs/ncurses/distros/cygwin.txt b/build/pkgs/ncurses/distros/cygwin.txt
deleted file mode 100644
index d29f30ce45b..00000000000
--- a/build/pkgs/ncurses/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libncurses-devel
diff --git a/build/pkgs/ninja_build/distros/cygwin.txt b/build/pkgs/ninja_build/distros/cygwin.txt
deleted file mode 100644
index 63730036fd3..00000000000
--- a/build/pkgs/ninja_build/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-ninja
diff --git a/build/pkgs/ntl/distros/cygwin.txt b/build/pkgs/ntl/distros/cygwin.txt
deleted file mode 100644
index fe822a6c887..00000000000
--- a/build/pkgs/ntl/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libntl-devel
diff --git a/build/pkgs/openblas/distros/cygwin.txt b/build/pkgs/openblas/distros/cygwin.txt
deleted file mode 100644
index 055fa2733d1..00000000000
--- a/build/pkgs/openblas/distros/cygwin.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-liblapack-devel
-libopenblas
diff --git a/build/pkgs/openssl/distros/cygwin.txt b/build/pkgs/openssl/distros/cygwin.txt
deleted file mode 100644
index 77c51ef8194..00000000000
--- a/build/pkgs/openssl/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libssl-devel
diff --git a/build/pkgs/patch/distros/cygwin.txt b/build/pkgs/patch/distros/cygwin.txt
deleted file mode 100644
index 9eb7b90ed50..00000000000
--- a/build/pkgs/patch/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-patch
diff --git a/build/pkgs/perl_term_readline_gnu/distros/cygwin.txt b/build/pkgs/perl_term_readline_gnu/distros/cygwin.txt
deleted file mode 100644
index 3b6a90263dd..00000000000
--- a/build/pkgs/perl_term_readline_gnu/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-perl-Term-ReadLine-Gnu
diff --git a/build/pkgs/python3/distros/cygwin.txt b/build/pkgs/python3/distros/cygwin.txt
deleted file mode 100644
index 8e0df5adb0d..00000000000
--- a/build/pkgs/python3/distros/cygwin.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-# as of #27824, we use python3 for venv as well
-python39-devel
-# #34088 - make ensurepip work
-python-pip-wheel
-python-setuptools-wheel
diff --git a/build/pkgs/qhull/distros/cygwin.txt b/build/pkgs/qhull/distros/cygwin.txt
deleted file mode 100644
index 95d316779cf..00000000000
--- a/build/pkgs/qhull/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-qhull
diff --git a/build/pkgs/r/distros/cygwin.txt b/build/pkgs/r/distros/cygwin.txt
deleted file mode 100644
index f532411f70a..00000000000
--- a/build/pkgs/r/distros/cygwin.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-R
-libtirpc-devel # needed for building extensions
diff --git a/build/pkgs/readline/distros/cygwin.txt b/build/pkgs/readline/distros/cygwin.txt
deleted file mode 100644
index 1698f0e86b8..00000000000
--- a/build/pkgs/readline/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libreadline-devel
diff --git a/build/pkgs/sbcl/distros/cygwin.txt b/build/pkgs/sbcl/distros/cygwin.txt
deleted file mode 100644
index 0e94cb07231..00000000000
--- a/build/pkgs/sbcl/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-sbcl
diff --git a/build/pkgs/singular/distros/cygwin.txt b/build/pkgs/singular/distros/cygwin.txt
deleted file mode 100644
index 774625930f9..00000000000
--- a/build/pkgs/singular/distros/cygwin.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-singular-devel
-singular
diff --git a/build/pkgs/sqlite/distros/cygwin.txt b/build/pkgs/sqlite/distros/cygwin.txt
deleted file mode 100644
index ef624919561..00000000000
--- a/build/pkgs/sqlite/distros/cygwin.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-libsqlite3-devel
-sqlite3
diff --git a/build/pkgs/suitesparse/distros/cygwin.txt b/build/pkgs/suitesparse/distros/cygwin.txt
deleted file mode 100644
index fe7b2c3f23c..00000000000
--- a/build/pkgs/suitesparse/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libsuitesparseconfig-devel
diff --git a/build/pkgs/texlive/distros/cygwin.txt b/build/pkgs/texlive/distros/cygwin.txt
deleted file mode 100644
index ba0ee3a029f..00000000000
--- a/build/pkgs/texlive/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-texlive
diff --git a/build/pkgs/texlive_luatex/distros/cygwin.txt b/build/pkgs/texlive_luatex/distros/cygwin.txt
deleted file mode 100644
index ba0ee3a029f..00000000000
--- a/build/pkgs/texlive_luatex/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-texlive
diff --git a/build/pkgs/xz/distros/cygwin.txt b/build/pkgs/xz/distros/cygwin.txt
deleted file mode 100644
index d66e95ca507..00000000000
--- a/build/pkgs/xz/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-xz
diff --git a/build/pkgs/zeromq/distros/cygwin.txt b/build/pkgs/zeromq/distros/cygwin.txt
deleted file mode 100644
index 57737d06afb..00000000000
--- a/build/pkgs/zeromq/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-libzmq-devel
diff --git a/build/pkgs/zlib/distros/cygwin.txt b/build/pkgs/zlib/distros/cygwin.txt
deleted file mode 100644
index f47c16b504b..00000000000
--- a/build/pkgs/zlib/distros/cygwin.txt
+++ /dev/null
@@ -1 +0,0 @@
-zlib-devel

From bcf4fc997be3f5ca640f2aa26b5b93340de29c09 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 13 Nov 2024 17:17:54 -0500
Subject: [PATCH 5/7] src/doc/en/developer/portability_testing.rst: don't
 mention cygwin.txt

---
 src/doc/en/developer/portability_testing.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/doc/en/developer/portability_testing.rst b/src/doc/en/developer/portability_testing.rst
index 55cefd0bf60..0f8d9e4b30f 100644
--- a/src/doc/en/developer/portability_testing.rst
+++ b/src/doc/en/developer/portability_testing.rst
@@ -259,7 +259,7 @@ This information comes from Sage's database of equivalent system
 packages.  For example::
 
   $ ls build/pkgs/flint/distros/
-  alpine.txt  cygwin.txt  fedora.txt   gentoo.txt    macports.txt  opensuse.txt  void.txt
+  alpine.txt  fedora.txt  gentoo.txt   macports.txt  opensuse.txt  void.txt
   conda.txt   debian.txt  freebsd.txt  homebrew.txt  nix.txt       repology.txt
   $ cat build/pkgs/flint/distros/debian.txt
   libflint-dev

From db1b0befe6d4fbcfdf37b932e414cae765909b3d Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 13 Nov 2024 17:20:53 -0500
Subject: [PATCH 6/7] build/pkgs/sqlite/spkg-configure.m4: drop cygwin case

---
 build/pkgs/sqlite/spkg-configure.m4 | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/build/pkgs/sqlite/spkg-configure.m4 b/build/pkgs/sqlite/spkg-configure.m4
index 901e27f19e3..5fe929ea03b 100644
--- a/build/pkgs/sqlite/spkg-configure.m4
+++ b/build/pkgs/sqlite/spkg-configure.m4
@@ -33,15 +33,8 @@ SAGE_SPKG_CONFIGURE([sqlite], [
   m4_popdef([SAGE_SQLITE3_MIN_VERSION_MICRO])
   m4_popdef([SAGE_SQLITE3_MIN_VERSION])
 ], [dnl REQUIRED-CHECK
-  AS_CASE([$host],
-          [*-*-cygwin*], [
-            dnl sqlite SetDllDirectory in sage_ostools.pyx
-            sage_require_sqlite=yes
-          ], [
-            AC_REQUIRE([SAGE_SPKG_CONFIGURE_PYTHON3])
-            AS_IF([test x$sage_spkg_install_python3 = xno], [
-                sage_require_sqlite=no
-            ])
-          ])
-]
-)
+  AC_REQUIRE([SAGE_SPKG_CONFIGURE_PYTHON3])
+  AS_IF([test x$sage_spkg_install_python3 = xno], [
+    sage_require_sqlite=no
+  ])
+])

From 704bad02a1165f65b43a584518a0aaf44e462608 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 13 Nov 2024 17:22:02 -0500
Subject: [PATCH 7/7] build/pkgs/python3/spkg-configure.m4: delete cygwin case

---
 build/pkgs/python3/spkg-configure.m4 | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/build/pkgs/python3/spkg-configure.m4 b/build/pkgs/python3/spkg-configure.m4
index a51e2394e51..c6938ea7080 100644
--- a/build/pkgs/python3/spkg-configure.m4
+++ b/build/pkgs/python3/spkg-configure.m4
@@ -70,12 +70,6 @@ SAGE_SPKG_CONFIGURE([python3], [
           sage_spkg_install_python3=yes
       ])
     ])
-    AS_CASE([$host],
-            [*-*-cygwin*], [AS_VAR_IF([sage_spkg_install_python3], [yes], [
-                                AS_VAR_APPEND([SAGE_SPKG_ERRORS], ["
-  On Cygwin, python3 must be installed as a system package. This is an error."])
-                            ])
-                           ])
 ],, [
     dnl PRE
 ], [