diff --git a/lib/licenses.nix b/lib/licenses.nix
index 6ba244b88b82f..291c66ea850e7 100644
--- a/lib/licenses.nix
+++ b/lib/licenses.nix
@@ -1290,6 +1290,15 @@ lib.mapAttrs mkLicense ({
   watcom = {
     spdxId = "Watcom-1.0";
     fullName = "Sybase Open Watcom Public License 1.0";
+    # Despite being OSI‐approved, this licence is not considered FOSS
+    # by Debian, Fedora, or the FSF, due to an onerous restriction that
+    # requires publication of even privately‐deployed modifications.
+    # This violates the FSF’s freedom 3 and Debian’s “desert island
+    # test” and “dissident test”.
+    #
+    # See: <https://en.wikipedia.org/wiki/Sybase_Open_Watcom_Public_License>
+    free = false;
+    redistributable = true;
   };
 
   w3c = {
diff --git a/pkgs/tools/archivers/7zz/default.nix b/pkgs/tools/archivers/7zz/default.nix
index 8a0b1365ee2de..ca8f8366f7f6b 100644
--- a/pkgs/tools/archivers/7zz/default.nix
+++ b/pkgs/tools/archivers/7zz/default.nix
@@ -2,9 +2,9 @@
 , lib
 , fetchzip
 
-  # Only used for Linux's x86/x86_64
+  # Only useful on Linux x86/x86_64, and brings in non‐free Open Watcom
 , uasm
-, useUasm ? (stdenv.hostPlatform.isLinux && stdenv.hostPlatform.isx86)
+, useUasm ? false
 
   # RAR code is under non-free unRAR license
   # see the meta.license section below for more details