def requirements(self):
    if self.options.iconv:
        self.requires('libiconv/1.16')
    if (self.settings.os == 'Linux'):
        self.requires('xorg/system')
        if self.options.alsa:
            self.requires('libalsa/1.2.4')
        if self.options.pulse:
            self.requires('pulseaudio/13.0')
        if self.options.opengl:
            self.requires('opengl/system')
    if self.options.get_safe('libunwind', False):
        self.requires('libunwind/1.5.0')
def requirements(self):
    if self.options.iconv:
        self.requires('libiconv/1.16')
    if (self.settings.os == 'Linux'):
        self.requires('xorg/system')
        if self.options.alsa:
            self.requires('libalsa/1.2.4')
        if self.options.pulse:
            self.requires('pulseaudio/13.0')
        if self.options.opengl:
            self.requires('opengl/system')
    if self.options.get_safe('libunwind', False):
        self.requires('libunwind/1.5.0')