QMAKE_MKDIR_CMD How To ?

[ningen]

There are qt specs.
mkspecs\common\shell-unix.conf:
@QMAKE_TAR = tar -cf
QMAKE_GZIP = gzip -9f

QMAKE_COPY = cp -f
QMAKE_COPY_FILE = $$QMAKE_COPY
QMAKE_COPY_DIR = $$QMAKE_COPY -R
QMAKE_MOVE = mv -f
QMAKE_DEL_FILE = rm -f
QMAKE_DEL_DIR = rmdir
QMAKE_CHK_EXISTS = test -e %1 ||
QMAKE_CHK_DIR_EXISTS = test -d # legacy
QMAKE_MKDIR = mkdir -p # legacy
QMAKE_MKDIR_CMD = test -d %1 || mkdir -p %1
QMAKE_STREAM_EDITOR = sed@

mkspecs\common\shell-win32.conf:
@
QMAKE_ZIP = zip -r -9

QMAKE_COPY = copy /y
QMAKE_COPY_DIR = xcopy /s /q /y /i
QMAKE_MOVE = move
QMAKE_DEL_FILE = del
QMAKE_DEL_DIR = rmdir
QMAKE_CHK_EXISTS = if not exist %1
QMAKE_CHK_DIR_EXISTS = if not exist # legacy
QMAKE_MKDIR = mkdir # legacy
QMAKE_MKDIR_CMD = if not exist %1 mkdir %1 & if not exist %1 exit 1@

I try use it:
@my.commands=$$quote($$QMAKE_MKDIR_CMD mydir && $$QMAKE_COPY file1 mydir/file2 $$escape_expand(\n\t))@

And so I'm getting the result:
@test -d %1 || mkdir -p %1 mydir && cp -f file1 mydir/file2 @

But I want:
@test -d mydir || mkdir -p mydir && cp -f file1 mydir/file2 @

How do i make it was this?

[zorn]

$$sprintf($$QMAKE_MKDIR_CMD, "mydir")

[zorn]

$$sprintf($$QMAKE_MKDIR_CMD, "mydir")