diff --git a/WINGs/wings-rs/Makefile.am b/WINGs/wings-rs/Makefile.am
index 14eda0fe..f3fd5fc2 100644
--- a/WINGs/wings-rs/Makefile.am
+++ b/WINGs/wings-rs/Makefile.am
@@ -18,7 +18,7 @@ RUST_EXTRA = \
 	Cargo.lock \
 	Cargo.toml
 
-src/WINGsP.rs: ../WINGs/WINGsP.h ../../wrlib/wraster.h ../WINGs/WINGs.h ../WINGs/WUtil.h Makefile patch_WINGsP.sh
+src/WINGsP.rs: ../WINGs/WINGsP.h ../../wrlib/wraster.h ../WINGs/WINGs.h ../WINGs/WUtil.h Makefile patch_WINGsP.sed
 	$(BINDGEN) ../WINGs/WINGsP.h \
 	--no-recursive-allowlist \
 	--allowlist-type "^W_.+|^WM(View|Array|DragOperationType|Point|Data|OpenPanel|SavePanel|HashTable|DraggingInfo|SelectionProcs|Rect|EventProc|Widget|Size|Pixmap|FilePanel|List|ListItem)" \
@@ -55,7 +55,8 @@ src/WINGsP.rs: ../WINGs/WINGsP.h ../../wrlib/wraster.h ../WINGs/WINGs.h ../WINGs
 	-o src/WINGsP.rs -- \
 	@PANGO_CFLAGS@ \
 	-I../../wrlib \
-	-I.. && ./patch_WINGsP.sh src/WINGsP.rs
+	-I.. \
+	&& sed -i -r -f patch_WINGsP.sed src/WINGsP.rs
 
 Cargo.lock:
 	$(CARGO) build
diff --git a/WINGs/wings-rs/patch_WINGsP.sed b/WINGs/wings-rs/patch_WINGsP.sed
new file mode 100755
index 00000000..f765e13a
--- /dev/null
+++ b/WINGs/wings-rs/patch_WINGsP.sed
@@ -0,0 +1,10 @@
+# This file provides ad-hoc fixups to the WINGsP bindings provided by bindgen:
+#  - Import Xlib symbols so that everything compiles.
+#  - Import FFI symbols from Rust bindings and rewrites.
+#  - The opaque type names _XftDraw and _XftFont are replaced with void*.
+#  - Pango bindings aren't yet pulled into our Rust code, so PangoLayout is also demoted to void*.
+
+1s/^/use wrlib_rs::ffi::*;\nuse wutil_rs::range::ffi::*;\nuse x11::xlib::*;\nuse crate::ffi::*;\n\n/
+s/_XftDraw/::std::ffi::c_void/g
+s/_XftFont/::std::ffi::c_void/g
+s/PangoLayout/::std::ffi::c_void/g
diff --git a/WINGs/wings-rs/patch_WINGsP.sh b/WINGs/wings-rs/patch_WINGsP.sh
deleted file mode 100755
index 966ed1ea..00000000
--- a/WINGs/wings-rs/patch_WINGsP.sh
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/bin/sh
-
-# This file provides ad-hoc fixups to the WINGsP provided by bindgen:
-#  - Import Xlib symbols so that everything compiles.
-#  - The opaque type names _XftDraw and _XftFont are replaced with void*.
-#  - Pango bindings aren't yet pulled into our Rust code, so PangoLayout is also demoted to void*.
-
-set -e
-
-if [ "x$1" = "x" ]; then
-    echo "Usage: $(basename $0) <file to patch>"
-    exit 1
-fi
-
-FILE="$1"
-
-exec sed -i -r \
-     -e "1s/^/use wrlib_rs::ffi::*;\nuse wutil_rs::range::ffi::*;\nuse x11::xlib::*;\nuse crate::ffi::*;\n\n/" \
-     -e "s/_XftDraw/::std::ffi::c_void/g" \
-     -e "s/_XftFont/::std::ffi::c_void/g" \
-     -e "s/PangoLayout/::std::ffi::c_void/g" \
-     "$1"