From: stuff overlay maintainer
Subject: Always link webkit2gtk on Unix

WebView.cpp calls webkit_javascript_result_unref() directly, so under
ld --as-needed (the Gentoo default) the webkit2gtk-4.1 dependency must
be on the link line. Upstream only added it under FLATPAK; do it for
every Unix non-Apple build.

--- a/src/slic3r/CMakeLists.txt
+++ b/src/slic3r/CMakeLists.txt
@@ -787,13 +787,11 @@
     find_package(PkgConfig REQUIRED)
     find_package(GTK${SLIC3R_GTK} REQUIRED)
     pkg_check_modules(LIBSECRET REQUIRED libsecret-1)
-    if (FLATPAK)
-        # I don't know why this is needed, but for whatever reason slic3r isn't
-        # linking to X11 and webkit2gtk. force it.
-        find_package(X11 REQUIRED)
-        pkg_check_modules(webkit2gtk REQUIRED webkit2gtk-4.1)
-        target_link_libraries(libslic3r_gui ${X11_LIBRARIES} ${webkit2gtk_LIBRARIES})
-    endif()
+    # WebView.cpp uses webkit2gtk-4.1 symbols directly; link explicitly so
+    # ld --as-needed does not drop them.
+    find_package(X11 REQUIRED)
+    pkg_check_modules(webkit2gtk REQUIRED webkit2gtk-4.1)
+    target_link_libraries(libslic3r_gui ${X11_LIBRARIES} ${webkit2gtk_LIBRARIES})
     target_include_directories(libslic3r_gui SYSTEM PRIVATE ${GTK${SLIC3R_GTK}_INCLUDE_DIRS} ${LIBSECRET_INCLUDE_DIRS})
     target_link_libraries(libslic3r_gui ${GTK${SLIC3R_GTK}_LIBRARIES} fontconfig ${LIBSECRET_LIBRARIES})