How to use the bypy.constants.PREFIX function in bypy

def compile_launcher_lib(contents_dir, gcc, base, pyver):
    print('\tCompiling calibre_launcher.dylib')
    env, env_vals = [], []
    for key, val in ENV.items():
        env.append(f'"{key}"'), env_vals.append(f'"{val}"')
    env = ','.join(env)
    env_vals = ','.join(env_vals)

    dest = join(contents_dir, 'Frameworks', 'calibre-launcher.dylib')
    src = join(base, 'util.c')
    cmd = [gcc] + '-Wall -dynamiclib -std=gnu99'.split() + [src] + \
        ['-I' + base] + '-DPY_VERSION_MAJOR={} -DPY_VERSION_MINOR={}'.format(*pyver.split('.')).split() + \
        [f'-DENV_VARS={env}', f'-DENV_VAR_VALS={env_vals}'] + \
        ['-I%s/python/Python.framework/Versions/Current/Headers' % PREFIX] + \
        '-current_version 1.0 -compatibility_version 1.0'.split() + \
        '-fvisibility=hidden -o'.split() + [dest] + \
        ['-install_name',
         '@executable_path/../Frameworks/' + os.path.basename(dest)] + \
        [('-F%s/python' % PREFIX), '-framework', 'Python', '-framework', 'CoreFoundation', '-headerpad_max_install_names']
    # print('\t'+' '.join(cmd))
    sys.stdout.flush()
    subprocess.check_call(cmd)
    return dest

def binary_includes():
    return [
        j(PREFIX, 'bin', x) for x in ('pdftohtml', 'pdfinfo', 'pdftoppm', 'optipng', 'JxrDecApp')] + [

        j(PREFIX, 'private', 'mozjpeg', 'bin', x) for x in ('jpegtran', 'cjpeg')] + [
        ] + list(map(
            get_dll_path,
            ('usb-1.0 mtp expat sqlite3 ffi z openjp2 poppler dbus-1 iconv xml2 xslt jpeg png16'
             ' webp webpmux webpdemux exslt ncursesw readline chm hunspell-1.7 hyphen'
             ' icudata icui18n icuuc icuio gcrypt gpg-error'
             ' gobject-2.0 glib-2.0 gthread-2.0 gmodule-2.0 gio-2.0 dbus-glib-1').split()
        )) + [
            get_dll_path('podofo', 3), get_dll_path('bz2', 2), j(PREFIX, 'lib', 'libunrar.so'),
            get_dll_path('ssl', 3), get_dll_path('crypto', 3), get_dll_path('python' + py_ver, 2),
            # We dont include libstdc++.so as the OpenGL dlls on the target
            # computer fail to load in the QPA xcb plugin if they were compiled
            # with a newer version of gcc than the one on the build computer.
            # libstdc++, like glibc is forward compatible and I dont think any
            # distros do not have libstdc++.so.6, so it should be safe to leave it out.
            # https://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html (The current
            # debian stable libstdc++ is  libstdc++.so.6.0.17)

def binary_includes():
    return [
        j(PREFIX, 'bin', x) for x in ('pdftohtml', 'pdfinfo', 'pdftoppm', 'optipng', 'JxrDecApp')] + [

        j(PREFIX, 'private', 'mozjpeg', 'bin', x) for x in ('jpegtran', 'cjpeg')] + [
        ] + list(map(
            get_dll_path,
            ('usb-1.0 mtp expat sqlite3 ffi z openjp2 poppler dbus-1 iconv xml2 xslt jpeg png16'
             ' webp webpmux webpdemux exslt ncursesw readline chm hunspell-1.7 hyphen'
             ' icudata icui18n icuuc icuio gcrypt gpg-error'
             ' gobject-2.0 glib-2.0 gthread-2.0 gmodule-2.0 gio-2.0 dbus-glib-1').split()
        )) + [
            get_dll_path('podofo', 3), get_dll_path('bz2', 2), j(PREFIX, 'lib', 'libunrar.so'),
            get_dll_path('ssl', 3), get_dll_path('crypto', 3), get_dll_path('python' + py_ver, 2),
            # We dont include libstdc++.so as the OpenGL dlls on the target
            # computer fail to load in the QPA xcb plugin if they were compiled
            # with a newer version of gcc than the one on the build computer.
            # libstdc++, like glibc is forward compatible and I dont think any
            # distros do not have libstdc++.so.6, so it should be safe to leave it out.

def binary_includes():
    return [
        j(PREFIX, 'bin', x) for x in ('pdftohtml', 'pdfinfo', 'pdftoppm', 'optipng', 'JxrDecApp')] + [

        j(PREFIX, 'private', 'mozjpeg', 'bin', x) for x in ('jpegtran', 'cjpeg')] + [
        ] + list(map(
            get_dll_path,
            ('usb-1.0 mtp expat sqlite3 ffi z poppler dbus-1 iconv xml2 xslt jpeg png16'
             ' webp webpmux webpdemux exslt ncursesw readline chm'
             ' icudata icui18n icuuc icuio gcrypt gpg-error'
             ' gobject-2.0 glib-2.0 gthread-2.0 gmodule-2.0 gio-2.0 dbus-glib-1').split()
        )) + [
            get_dll_path('podofo', 3), get_dll_path('bz2', 2), j(PREFIX, 'lib', 'libunrar.so'),
            get_dll_path('ssl', 3), get_dll_path('crypto', 3), get_dll_path('python' + py_ver, 2),
            # We dont include libstdc++.so as the OpenGL dlls on the target
            # computer fail to load in the QPA xcb plugin if they were compiled
            # with a newer version of gcc than the one on the build computer.
            # libstdc++, like glibc is forward compatible and I dont think any
            # distros do not have libstdc++.so.6, so it should be safe to leave it out.

def add_python_framework(self):
        print('\nAdding Python framework')
        src = join(PREFIX + '/python', 'Python.framework')
        x = join(self.frameworks_dir, 'Python.framework')
        curr = os.path.realpath(join(src, 'Versions', 'Current'))
        currd = join(x, 'Versions', basename(curr))
        rd = join(currd, 'Resources')
        os.makedirs(rd)
        shutil.copy2(join(curr, 'Resources', 'Info.plist'), rd)
        shutil.copy2(join(curr, 'Python'), currd)
        self.set_id(join(currd, 'Python'),
                    self.FID + '/Python.framework/Versions/%s/Python' % basename(curr))
        # The following is needed for codesign in OS X >= 10.9.5
        with current_dir(x):
            os.symlink(basename(curr), 'Versions/Current')
            for y in ('Python', 'Resources'):
                os.symlink('Versions/Current/%s' % y, y)

import time
from functools import partial

from bypy.constants import (
    OUTPUT_DIR, PREFIX, SRC as CALIBRE_DIR, is64bit, python_major_minor_version
)
from bypy.utils import (
    create_job, get_dll_path, mkdtemp, parallel_build, py_compile, run, walk
)

j = os.path.join
self_dir = os.path.dirname(os.path.abspath(__file__))
arch = 'x86_64' if is64bit else 'i686'

py_ver = '.'.join(map(str, python_major_minor_version()))
QT_PREFIX = os.path.join(PREFIX, 'qt')
iv = globals()['init_env']
calibre_constants = iv['calibre_constants']
QT_DLLS, QT_PLUGINS, PYQT_MODULES = iv['QT_DLLS'], iv['QT_PLUGINS'], iv['PYQT_MODULES']
qt_get_dll_path = partial(get_dll_path, loc=os.path.join(QT_PREFIX, 'lib'))


def binary_includes():
    return [
        j(PREFIX, 'bin', x) for x in ('pdftohtml', 'pdfinfo', 'pdftoppm', 'optipng', 'JxrDecApp')] + [

        j(PREFIX, 'private', 'mozjpeg', 'bin', x) for x in ('jpegtran', 'cjpeg')] + [
        ] + list(map(
            get_dll_path,
            ('usb-1.0 mtp expat sqlite3 ffi z poppler dbus-1 iconv xml2 xslt jpeg png16'
             ' webp webpmux webpdemux exslt ncursesw readline chm'
             ' icudata icui18n icuuc icuio gcrypt gpg-error'

import runpy
import shutil
import stat
import subprocess
import sys
import zipfile

from bypy.constants import (
    CL, LINK, MT, PREFIX, RC, SIGNTOOL, SRC as CALIBRE_DIR, SW, build_dir, is64bit,
    python_major_minor_version, worker_env
)
from bypy.utils import py_compile, run, walk

iv = globals()['init_env']
calibre_constants = iv['calibre_constants']
QT_PREFIX = os.path.join(PREFIX, 'qt')
QT_DLLS, QT_PLUGINS, PYQT_MODULES = iv['QT_DLLS'], iv['QT_PLUGINS'], iv['PYQT_MODULES']

APPNAME, VERSION = calibre_constants['appname'], calibre_constants['version']
WINVER = VERSION + '.0'
machine = 'X64' if is64bit else 'X86'
j, d, a, b = os.path.join, os.path.dirname, os.path.abspath, os.path.basename
create_installer = runpy.run_path(
    j(d(a(__file__)), 'wix.py'), {'calibre_constants': calibre_constants}
)['create_installer']

DESCRIPTIONS = {
    'calibre': 'The main calibre program',
    'ebook-viewer': 'The calibre e-book viewer',
    'ebook-edit': 'The calibre e-book editor',
    'lrfviewer': 'Viewer for LRF files',
    'ebook-convert': 'Command line interface to the conversion/news download system',

def run(*args, **extra_env):
    env = os.environ.copy()
    env.update(worker_env)
    env.update(extra_env)
    env['SW'] = PREFIX
    env['LD_LIBRARY_PATH'] = LIBDIR
    env['SIP_BIN'] = os.path.join(PREFIX, 'bin', 'sip')
    env['QMAKE'] = os.path.join(PREFIX, 'qt', 'bin', 'qmake')
    return subprocess.call(list(args), env=env, cwd=CALIBRE_DIR)

tgt = j(env.app_base, 'resources')
    if os.path.exists(tgt):
        shutil.rmtree(tgt)
    shutil.copytree(j(env.src_root, 'resources'), tgt)

    printf('\tAdding misc binary deps')

    def copybin(x):
        shutil.copy2(x, env.dll_dir)
        try:
            shutil.copy2(x + '.manifest', env.dll_dir)
        except EnvironmentError as err:
            if err.errno != errno.ENOENT:
                raise

    bindir = os.path.join(PREFIX, 'bin')
    for x in ('pdftohtml', 'pdfinfo', 'pdftoppm', 'jpegtran-calibre', 'cjpeg-calibre', 'optipng-calibre', 'JXRDecApp-calibre'):
        copybin(os.path.join(bindir, x + '.exe'))
    for f in glob.glob(os.path.join(bindir, '*.dll')):
        if re.search(r'(easylzma|icutest)', f.lower()) is None:
            copybin(f)

    copybin(os.path.join(env.python_base, 'python%s.dll' % env.py_ver.replace('.', '')))
    for x in glob.glob(os.path.join(env.python_base, 'DLLs', '*')):  # python pyd modules
        copybin(x)
    for f in walk(os.path.join(env.python_base, 'Lib')):
        if f.lower().endswith('.dll') and 'scintilla' not in f.lower():
            copybin(f)
    add_plugins(env, ext_dir)

    printf('Adding Qt...')
    for x in QT_DLLS:

import runpy
import shutil
import stat
import subprocess
import sys
import zipfile

from bypy.constants import (
    CL, LINK, MT, PREFIX, RC, SIGNTOOL, SRC as CALIBRE_DIR, SW, build_dir, is64bit,
    python_major_minor_version, worker_env
)
from bypy.utils import py_compile, run, walk

iv = globals()['init_env']
calibre_constants = iv['calibre_constants']
QT_PREFIX = os.path.join(PREFIX, 'qt')
QT_DLLS, QT_PLUGINS, PYQT_MODULES = iv['QT_DLLS'], iv['QT_PLUGINS'], iv['PYQT_MODULES']

APPNAME, VERSION = calibre_constants['appname'], calibre_constants['version']
WINVER = VERSION + '.0'
machine = 'X64' if is64bit else 'X86'
j, d, a, b = os.path.join, os.path.dirname, os.path.abspath, os.path.basename
create_installer = runpy.run_path(
    j(d(a(__file__)), 'wix.py'), {'calibre_constants': calibre_constants}
)['create_installer']

DESCRIPTIONS = {
    'calibre': 'The main calibre program',
    'ebook-viewer': 'The calibre e-book viewer',
    'ebook-edit': 'The calibre e-book editor',
    'lrfviewer': 'Viewer for LRF files',
    'ebook-convert': 'Command line interface to the conversion/news download system',