NixOS · Gigahawk · May 21, 2026
diff --git a/pkgs/by-name/pr/preflight/package.nix b/pkgs/by-name/pr/preflight/package.nix
@@ -0,0 +1,269 @@
+{
+  stdenv,
+  lib,
+  binutils,
+  fetchFromGitHub,
+  cmake,
+  pkg-config,
+  wrapGAppsHook3,
+  boost187,
+  c-blosc,
+  cereal,
+  cgal,
+  curl,
+  dbus,
+  eigen,
+  expat,
+  glew,
+  glib,
+  glib-networking,
+  gmp,
+  gtk3,
+  hicolor-icon-theme,
+  imath,
+  libjpeg_turbo,
+  libpng,
+  mpfr,
+  nanosvg,
+  nlohmann_json,
+  nlopt,
+  onetbb,
+  opencascade-occt,
+  openvdb,
+  pcre2,
+  python3,
+  python3Packages, # pybind11
+  qhull,
+  wxwidgets_3_2,
+  libx11,
+  libbgcode,
+  heatshrink,
+  catch2_3,
+  webkitgtk_4_1,
+  ctestCheckHook,
+  withSystemd ? lib.meta.availableOn stdenv.hostPlatform systemd,
+  systemd,
+  udevCheckHook,
+  z3,
+  nix-update-script,
+  wxGTK-override ? null,
+  opencascade-override ? null,
+
+}:
+let
+  nanosvg-fltk = nanosvg.overrideAttrs (old: {
+    pname = "nanosvg-fltk";
+    version = "unstable-2022-12-22";
+
+    src = fetchFromGitHub {
+      owner = "fltk";
+      repo = "nanosvg";
+      rev = "abcd277ea45e9098bed752cf9c6875b533c0892f";
+      hash = "sha256-WNdAYu66ggpSYJ8Kt57yEA4mSTv+Rvzj9Rm1q765HpY=";
+    };
+  });
+  wxGTK-override' = if wxGTK-override == null then wxwidgets_3_2 else wxGTK-override;
+  opencascade-override' =
+    if opencascade-override == null then opencascade-occt else opencascade-override;
+
+in
+stdenv.mkDerivation (finalAttrs: {
+  __structuredAttrs = true;
+  pname = "preflight";
+  version = "1.1.0";
+  src = fetchFromGitHub {
+    owner = "oozebot";
+    repo = "preFlight";
+    hash = "sha256-3m/mz0DwuhIo7E/9V8kL68TO0WjNGIHyFlG9EYtDeMs=";
+    tag = "v${finalAttrs.version}";
+  };
+
+  patches = [
+    # Fix for webkitgtk linking
+    ./patches/0001-not-for-upstream-CMakeLists-Link-against-webkit2gtk-.patch
+    # https://github.com/NixOS/nixpkgs/issues/415703
+    # https://gitlab.archlinux.org/archlinux/packaging/packages/prusa-slicer/-/merge_requests/5
+    ./patches/allow_wayland.patch
+  ];
+
+  postPatch = (
+    # Make Gcode viewer open newer bgcode files.
+    ''
+      substituteInPlace src/platform/unix/preFlightGcodeviewer.desktop \
+        --replace-fail 'MimeType=text/x.gcode;' 'MimeType=application/x-bgcode;text/x.gcode;'
+    ''
+    # Make preFlight handle the url "prusaslicer://"
+    + ''
+      substituteInPlace src/platform/unix/preFlight.desktop \
+        --replace-fail \
+        'Exec=preflight %F' \
+        'Exec=preflight %U'
+
+      substituteInPlace src/platform/unix/preFlight.desktop \
+        --replace-fail \
+        'MimeType=model/stl;application/vnd.ms-3mfdocument;application/prs.wavefront-obj;application/x-amf;' \
+        'MimeType=model/stl;application/vnd.ms-3mfdocument;application/prs.wavefront-obj;application/x-amf;x-scheme-handler/prusaslicer;'
+    ''
+  );
+
+  nativeBuildInputs = [
+    cmake
+    pkg-config
+    python3
+    wrapGAppsHook3
+    wxGTK-override'
+    udevCheckHook
+  ];
+
+  buildInputs = [
+    binutils
+    boost187
+    c-blosc
+    cereal
+    cgal
+    curl
+    dbus
+    eigen
+    expat
+    glew
+    glib
+    glib-networking
+    gmp
+    gtk3
+    hicolor-icon-theme
+    imath
+    libjpeg_turbo
+    libpng
+    mpfr
+    nanosvg-fltk
+    nlopt
+    onetbb
+    opencascade-override'
+    openvdb
+    pcre2
+    python3
+    python3Packages.pybind11
+    qhull
+    wxGTK-override'
+    libx11
+    libbgcode
+    heatshrink
+    catch2_3
+    webkitgtk_4_1
+    z3
+    nlohmann_json
+
+  ]
+  ++ lib.optionals withSystemd [
+    systemd
+  ];
+
+  strictDeps = true;
+
+  # Causes wrapGAppsHook3 to only wrap the debug output
+  separateDebugInfo = false;
+
+  doInstallCheck = true;
+
+  env = {
+    # The build system uses custom logic - defined in
+    # cmake/modules/FindNLopt.cmake in the package source - for finding the nlopt
+    # library, which doesn't pick up the package in the nix store.  We
+    # additionally need to set the path via the NLOPT environment variable.
+    NLOPT = nlopt;
+  }
+  // lib.optionalAttrs withSystemd {
+    # prusa-slicer uses dlopen on `libudev.so` at runtime
+    NIX_LDFLAGS = "-ludev";
+  };
+
+  prePatch = ''
+    # Since version 2.5.0 of nlopt we need to link to libnlopt, as libnlopt_cxx
+    # now seems to be integrated into the main lib.
+    sed -i 's|nlopt_cxx|nlopt|g' cmake/modules/FindNLopt.cmake
+
+    # https://github.com/prusa3d/PrusaSlicer/issues/9581
+    if [ -f "cmake/modules/FindEXPAT.cmake" ]; then
+      rm cmake/modules/FindEXPAT.cmake
+    fi
+
+    # Fix resources folder location on macOS
+    substituteInPlace src/${
+      if finalAttrs.pname == "preflight" then "CLI/Setup.cpp" else "preFlight.cpp"
+    } \
+      --replace-fail "#ifdef __APPLE__" "#if 0"
+
+    substituteInPlace src/libslic3r/CMakeLists.txt \
+      --replace-fail "libjpeg-turbo::jpeg-static" "libjpeg-turbo::jpeg"
+
+    substituteInPlace \
+      src/libslic3r/GCode/PostProcessor.cpp \
+      src/slic3r/GUI/RemovableDriveManager.cpp \
+      src/slic3r/Utils/Process.cpp \
+        --replace-fail "<boost/process.hpp>" "<boost/process/v2.hpp>"
+  '';
+
+  cmakeFlags = [
+    "-DSLIC3R_STATIC=0"
+    "-DSLIC3R_FHS=1"
+    "-DSLIC3R_GTK=3"
+    "-DCMAKE_CXX_FLAGS=-DBOOST_LOG_DYN_LINK"
+    # there is many different min versions set accross different
+    # Find*.cmake files, substituting them all is not viable
+    "-DCMAKE_POLICY_VERSION_MINIMUM=3.10"
+    "-DCMAKE_INTERPROCEDURAL_OPTIMIZATION=OFF"
+    "-Wno-dev"
+  ];
+  NIX_CFLAGS_COMPILE = "-fno-lto";
+  NIX_CXXFLAGS_COMPILE = "-fno-lto";
+
+  postInstall = ''
+    ln -s "$out/bin/preflight" "$out/bin/preflight-gcodeviewer"
+
+    mkdir -p "$out"/share/mime/packages
+    cat << EOF > "$out"/share/mime/packages/preflight-gcode-viewer.xml
+    <?xml version="1.0" encoding="UTF-8"?>
+    <mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
+      <mime-type type="application/x-bgcode">
+        <comment xml:lang="en">Binary G-code file</comment>
+        <glob pattern="*.bgcode"/>
+      </mime-type>
+    </mime-info>
+    EOF
+  '';
+
+  preFixup = ''
+    gappsWrapperArgs+=(
+      --prefix LD_LIBRARY_PATH : "$out/lib"
+    )
+  '';
+
+  doCheck = true;
+  nativeCheckInputs = [ ctestCheckHook ];
+  checkFlags = [
+    "--force-new-ctest-process"
+    "-E"
+    "libslic3r_tests|sla_print_tests"
+  ];
+
+  passthru.updateScript = nix-update-script {
+    extraArgs = [
+      "--version-regex"
+      "^v(.+)$"
+    ];
+  };
+
+  meta = {
+    description = "G-code generator for 3D printer";
+    homepage = "preflight3d.com";
+    changelog = "https://github.com/oozebot/preFlight/releases/tag/${finalAttrs.src.tag}";
+    license = lib.licenses.agpl3Plus;
+    maintainers = with lib.maintainers; [
+      gigahawk
+    ];
+    platforms = lib.platforms.unix;
+  }
+  // lib.optionalAttrs (stdenv.hostPlatform.isDarwin) {
+    mainProgram = "preFlight";
+  };
+})
diff --git a/...name/pr/preflight/patches/0001-not-for-upstream-CMakeLists-Link-against-webkit2gtk-.patch b/...name/pr/preflight/patches/0001-not-for-upstream-CMakeLists-Link-against-webkit2gtk-.patch
@@ -0,0 +1,29 @@
+From ddbcc5d287641ff35ccf17f069cb1fb929948118 Mon Sep 17 00:00:00 2001
+From: Jasper Chan <jasperchan515@gmail.com>
+Date: Wed, 20 May 2026 15:19:27 -0700
+Subject: [PATCH] [not for upstream] CMakeLists: Link against webkit2gtk in
+ libslic3r_gui
+
+---
+ src/CMakeLists.txt | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index 9e16369..dd156e8 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -260,6 +260,11 @@ if (WIN32)
+     endif ()
+ endif ()
+
++# We link against webkit2gtk symbols in src/slic3r/GUI/Widgets/WebView.cpp
++if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
++    target_link_libraries(libslic3r_gui PRIVATE webkit2gtk-4.1)
++endif ()
++
+ # Link the resources dir to where Slic3r GUI expects it
+ if (WIN32)
+     if (CMAKE_CONFIGURATION_TYPES)
+-- 
+2.53.0
+
diff --git a/pkgs/by-name/pr/preflight/patches/allow_wayland.patch b/pkgs/by-name/pr/preflight/patches/allow_wayland.patch
@@ -0,0 +1,60 @@
+From 618c5fbb9e3b30ab30b1c7afb257248d1dfb1212 Mon Sep 17 00:00:00 2001
+From: Jasper Chan <jasperchan515@gmail.com>
+Date: Mon, 8 Jun 2026 11:23:26 -0700
+Subject: [PATCH] remove forcing GDK_BACKEND to x11
+
+It seems the problems on Wayland from the past are removed meanwhile.
+---
+ src/CLI/GuiParams.cpp | 7 +++----
+ src/CLI/Setup.cpp     | 7 +------
+ 2 files changed, 4 insertions(+), 10 deletions(-)
+
+diff --git a/src/CLI/GuiParams.cpp b/src/CLI/GuiParams.cpp
+index 2589354..4a9fc67 100644
+--- a/src/CLI/GuiParams.cpp
++++ b/src/CLI/GuiParams.cpp
+@@ -130,9 +130,8 @@ int start_gui_with_params(GUI::GUI_InitParams &params)
+ #if !defined(_WIN32) && !defined(__APPLE__)
+     // likely some linux / unix system
+     const char *display = boost::nowide::getenv("DISPLAY");
+-    // const char *wayland_display = boost::nowide::getenv("WAYLAND_DISPLAY");
+-    //if (! ((display && *display) || (wayland_display && *wayland_display))) {
+-    if (!(display && *display))
++    const char *wayland_display = boost::nowide::getenv("WAYLAND_DISPLAY");
++    if (! ((display && *display) || (wayland_display && *wayland_display)))
+     {
+         // DISPLAY not set.
+         boost::nowide::cerr << "DISPLAY not set, GUI mode not available." << std::endl << std::endl;
+@@ -169,4 +168,4 @@ int start_as_gcode_viewer(GUI::GUI_InitParams &gui_params)
+ } // namespace Slic3r::CLI
+ #else  // SLIC3R_GUI
+ // If there is no GUI, we shall ignore the parameters. Remove them from the list.
+-#endif // SLIC3R_GUI
+\ No newline at end of file
++#endif // SLIC3R_GUI
+diff --git a/src/CLI/Setup.cpp b/src/CLI/Setup.cpp
+index 5c03b67..5552cfd 100644
+--- a/src/CLI/Setup.cpp
++++ b/src/CLI/Setup.cpp
+@@ -234,11 +234,6 @@ static bool setup_common()
+     save_main_thread_id();
+
+ #ifdef __WXGTK__
+-    // On Linux, wxGTK has no support for Wayland, and the app crashes on
+-    // startup if gtk3 is used. This env var has to be set explicitly to
+-    // instruct the window manager to fall back to X server mode.
+-    ::setenv("GDK_BACKEND", "x11", /* replace */ true);
+-
+     // WebKit2GTK's DMA-BUF renderer uses GBM EGL for compositing.
+     // Disable it when it will fail:
+     //   1. No GPU at all (VMs, RDP, headless) - no DRI render nodes
+@@ -415,4 +410,4 @@ bool setup(Data &cli, int argc, char **argv)
+     return true;
+ }
+
+-} // namespace Slic3r::CLI
+\ No newline at end of file
++} // namespace Slic3r::CLI
+-- 
+2.53.0
+