def package_do_pkgconfig(d):
    import re

    packages = d.getVar('PACKAGES')
    workdir = d.getVar('WORKDIR')
    pkgdest = d.getVar('PKGDEST')

    shlibs_dirs = d.getVar('SHLIBSDIRS').split()
    shlibswork_dir = d.getVar('SHLIBSWORKDIR')

    pc_re = re.compile('(.*)\.pc$')
    var_re = re.compile('(.*)=(.*)')
    field_re = re.compile('(.*): (.*)')

    pkgconfig_provided = {}
    pkgconfig_needed = {}
    for pkg in packages.split():
        pkgconfig_provided[pkg] = []
        pkgconfig_needed[pkg] = []
        for file in pkgfiles[pkg]:
                m = pc_re.match(file)
                if m:
                    pd = bb.data.init()
                    name = m.group(1)
                    pkgconfig_provided[pkg].append(name)
                    if not os.access(file, os.R_OK):
                        continue
                    f = open(file, 'r')
                    lines = f.readlines()
                    f.close()
                    for l in lines:
                        m = var_re.match(l)
                        if m:
                            name = m.group(1)
                            val = m.group(2)
                            pd.setVar(name, pd.expand(val))
                            continue
                        m = field_re.match(l)
                        if m:
                            hdr = m.group(1)
                            exp = pd.expand(m.group(2))
                            if hdr == 'Requires':
                                pkgconfig_needed[pkg] += exp.replace(',', ' ').split()

    # Take shared lock since we're only reading, not writing
    lf = bb.utils.lockfile(d.expand("${PACKAGELOCK}"), True)

    for pkg in packages.split():
        pkgs_file = os.path.join(shlibswork_dir, pkg + ".pclist")
        if pkgconfig_provided[pkg] != []:
            f = open(pkgs_file, 'w')
            for p in pkgconfig_provided[pkg]:
                f.write('%s\n' % p)
            f.close()

    # Go from least to most specific since the last one found wins
    for dir in reversed(shlibs_dirs):
        if not os.path.exists(dir):
            continue
        for file in os.listdir(dir):
            m = re.match('^(.*)\.pclist$', file)
            if m:
                pkg = m.group(1)
                fd = open(os.path.join(dir, file))
                lines = fd.readlines()
                fd.close()
                pkgconfig_provided[pkg] = []
                for l in lines:
                    pkgconfig_provided[pkg].append(l.rstrip())

    for pkg in packages.split():
        deps = []
        for n in pkgconfig_needed[pkg]:
            found = False
            for k in pkgconfig_provided.keys():
                if n in pkgconfig_provided[k]:
                    if k != pkg and not (k in deps):
                        deps.append(k)
                    found = True
            if found == False:
                bb.note("couldn't find pkgconfig module '%s' in any package" % n)
        deps_file = os.path.join(pkgdest, pkg + ".pcdeps")
        if len(deps):
            fd = open(deps_file, 'w')
            for dep in deps:
                fd.write(dep + '\n')
            fd.close()

    bb.utils.unlockfile(lf)

package_do_pkgconfig(d)