diff --git a/packaging/dependencies.nix b/packaging/dependencies.nix
index 08d179b82..a3d7a73e4 100644
--- a/packaging/dependencies.nix
+++ b/packaging/dependencies.nix
@@ -75,7 +75,7 @@ let
       # Users who are debugging Nix builds are expected to set the environment variable `mesonBuildType`, per the
       # guidance in https://github.com/NixOS/nix/blob/8a3fc27f1b63a08ac983ee46435a56cf49ebaf4a/doc/manual/source/development/debugging.md?plain=1#L10.
       # For this reason, we don't want to refer to `finalAttrs.mesonBuildType` here, but rather use the environment variable.
-      preConfigure = prevAttrs.preConfigure or "" + ''
+      preConfigure = prevAttrs.preConfigure or "" + lib.optionalString (!stdenv.hostPlatform.isWindows) ''
         case "$mesonBuildType" in
         release|minsize) appendToVar mesonFlags "-Db_lto=true"  ;;
         *)               appendToVar mesonFlags "-Db_lto=false" ;;
diff --git a/src/libutil/posix-source-accessor.cc b/src/libutil/posix-source-accessor.cc
index 8ee986d3f..70ad6474f 100644
--- a/src/libutil/posix-source-accessor.cc
+++ b/src/libutil/posix-source-accessor.cc
@@ -124,7 +124,9 @@ std::optional<SourceAccessor::Stat> PosixSourceAccessor::maybeLstat(const CanonP
             S_ISLNK(st->st_mode) ? tSymlink :
             S_ISCHR(st->st_mode) ? tChar :
             S_ISBLK(st->st_mode) ? tBlock :
+#ifdef S_ISSOCK
             S_ISSOCK(st->st_mode) ? tSocket :
+#endif
             S_ISFIFO(st->st_mode) ? tFifo :
             tUnknown,
         .fileSize = S_ISREG(st->st_mode) ? std::optional<uint64_t>(st->st_size) : std::nullopt,