-# Convert MSYS-style /x/foo file name into x:/foo that Windows can grok.
-msys_to_w32=sed -e 's,^/\([A-Za-z]\)/,\1:/,'
+# Convert MSYS-style /x/foo or Windows-style x:\foo file names
+# into x:/foo that Windows can grok.
+msys_to_w32=sed -e 's,\\\\,/,g' -e 's,^/\([A-Za-z]\)/,\1:/,'
+
+# Transform directory search path and its components. Original can
+# be MSYS or Windows style. Set path separator to ";", directory
+# separator to "/" and transform MSYS-style "/c/" to "c:/".
+# Remove empty path components and escape semicolons.
+msys_lisppath_to_w32=sed -e 's,\\\\,/,g' \
+ -e 's,\(^\|[:;]\)\([A-Za-z]\):/,\1/\2/,g' \
+ -e 's/:/;/g' -e 's,\(^\|;\)/\([A-Za-z]\)/,\1\2:/,g' \
+ -e 's/;\+/;/g' -e 's/^;//' -e 's/;$$//' -e 's/;/\\\\;/g'
+
+# Replace "${prefix}" with '%emacs_dir%' (which expands to install
+# directory at runtime).
+msys_prefix_subst=sed -e 's!\(^\|;\)'"$${prefixpattern}"'\([;/]\|$$\)!\1%emacs_dir%\2!g'
+
+# Quote Sed special characters (except backslash and newline) with
+# a double backslash.
+msys_sed_sh_escape=sed -e 's/[];$$*.^[]/\\\\&/g'