old_contents: import sys
  import os
  import re
  
  
  def get_lib_dirs():
      """
      Anaconda specific
      """
      if sys.platform == 'win32':
          # on windows, historically `DLLs` has been used for CUDA libraries,
          # since approximately CUDA 9.2, `Library\bin` has been used.
          dirnames = ['DLLs', os.path.join('Library', 'bin')]
      else:
          dirnames = ['lib', ]
      libdirs = [os.path.join(sys.prefix, x) for x in dirnames]
      return libdirs
  
  
  DLLNAMEMAP = {
      'linux': r'lib%(name)s\.so\.%(ver)s$',
      'linux2': r'lib%(name)s\.so\.%(ver)s$',
      'linux-static': r'lib%(name)s\.a$',
      'darwin': r'lib%(name)s\.%(ver)s\.dylib$',
      'win32': r'%(name)s%(ver)s\.dll$',
      'win32-static': r'%(name)s\.lib$',
      'bsd': r'lib%(name)s\.so\.%(ver)s$',
  }
  
  RE_VER = r'[0-9]*([_\.][0-9]+)*'
  
  
  def find_lib(libname, libdir=None, platform=None, static=False):
      platform = platform or sys.platform
      platform = 'bsd' if 'bsd' in platform else platform
      if static:
          platform = f"{platform}-static"
      pat = DLLNAMEMAP[platform] % {"name": libname, "ver": RE_VER}
      regex = re.compile(pat)
      return find_file(regex, libdir)
  
  
  def find_file(pat, libdir=None):
      if libdir is None:
          libdirs = get_lib_dirs()
      elif isinstance(libdir, str):
          libdirs = [libdir,]
      else:
          libdirs = list(libdir)
      files = []
      for ldir in libdirs:
          entries = os.listdir(ldir)
          candidates = [os.path.join(ldir, ent)
                        for ent in entries if pat.match(ent)]
          files.extend([c for c in candidates if os.path.isfile(c)])
      return files
  
new_contents: import sys
  import os
  import re
  
  
  def get_lib_dirs():
      """
      Anaconda specific
      """
      if sys.platform == 'win32':
          # on windows, historically `DLLs` has been used for CUDA libraries,
          # since approximately CUDA 9.2, `Library\bin` has been used.
          dirnames = ['DLLs', os.path.join('Library', 'bin')]
      else:
          dirnames = ['lib', ]
      libdirs = [os.path.join(sys.prefix, x) for x in dirnames]
      return libdirs
  
  
  DLLNAMEMAP = {
      'linux': r'lib%(name)s\.so\.%(ver)s$',
      'linux2': r'lib%(name)s\.so\.%(ver)s$',
      'linux-static': r'lib%(name)s\.a$',
      'darwin': r'lib%(name)s\.%(ver)s\.dylib$',
      'win32': r'%(name)s%(ver)s\.dll$',
      'win32-static': r'%(name)s\.lib$',
      'bsd': r'lib%(name)s\.so\.%(ver)s$',
  }
  
  RE_VER = r'[0-9]*([_\.][0-9]+)*'
  
  
  def find_lib(libname, libdir=None, platform=None, static=False):
      platform = platform or sys.platform
      platform = 'bsd' if 'bsd' in platform else platform
      if static:
          platform = f"{platform}-static"
      if platform not in DLLNAMEMAP:
          # Return empty list if platform name is undefined.
          # Not all platforms define their static library paths.
          return []
      pat = DLLNAMEMAP[platform] % {"name": libname, "ver": RE_VER}
      regex = re.compile(pat)
      return find_file(regex, libdir)
  
  
  def find_file(pat, libdir=None):
      if libdir is None:
          libdirs = get_lib_dirs()
      elif isinstance(libdir, str):
          libdirs = [libdir,]
      else:
          libdirs = list(libdir)
      files = []
      for ldir in libdirs:
          entries = os.listdir(ldir)
          candidates = [os.path.join(ldir, ent)
                        for ent in entries if pat.match(ent)]
          files.extend([c for c in candidates if os.path.isfile(c)])
      return files
  
subject: Fix error caused by missing "-static" libraries defines for some platform e.g. OSX and BSD