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Look up function:

(e.g. "List.find" or "keysym")
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#! /bin/sh

# Usage: patch @VARIABLE@ value
# Environment variable USE_CYGPATH is honoured.

varname="$1"
varvalue="$2"

if [ "${USE_CYGPATH}" = "1" ]; then
    #varvalue="$(echo "$varvalue" | sed -e 's;/;\\;g')"
    varvalue="$(cygpath -w -l "$varvalue")"
    varvalue="$(echo "$varvalue" | sed -e 's;\\;\\\\\\\\;g')"
    # e.g. c:\file is transformed to c:\\\\file
else
    case `uname` in
	MINGW*)
	    varvalue="$(echo "$varvalue" | sed -e 's;\\;\\\\\\\\;g')"
	    # Convert the first letter drive to DOS style (naive).
	    # This is necessary because OCaml uses DOS paths even if
	    # run under MSYS.
	    varvalue="$(echo "$varvalue" | sed -e 's;^/\([a-z]\)/;\1:/;g')"
	    ;;
    esac
fi

sed -e 's;'"$varname"';'"$varvalue"';g'
# e.g. c:\\\\file is parsed by sed as c:\\file which is correct for the
# ocaml string

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