每当我尝试使用 pip 安装 gphoto2 时，都会弹出此错误消息：
C:\Python27>pip 安装 gphoto2
Collecting gphoto2
Using cached https://files.pythonhosted.org/packages/13/20/16f4e17e0d799199c84
a7d3e4f181232071383acf71912da44de015b1812/gphoto2-1.8.3.tar.gz
Complete output from command python setup.py egg_info:
ERROR: command "pkg-config --modversion libgphoto2" failed
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\MACIE_~1\AppData\Local\Temp\pip-install-xybqgvtu\gphoto2\se
tup.py", line 38, in <module>
cmd, stderr=FNULL, universal_newlines=True).split('.')
File "c:\users\macie_000\appdata\local\programs\python\python37\lib\subpro
cess.py", line 376, in check_output
**kwargs).stdout
File "c:\users\macie_000\appdata\local\programs\python\python37\lib\subpro
cess.py", line 453, in run
with Popen(*popenargs, **kwargs) as process:
File "c:\users\macie_000\appdata\local\programs\python\python37\lib\subpro
cess.py", line 756, in __init__
restore_signals, start_new_session)
File "c:\users\macie_000\appdata\local\programs\python\python37\lib\subpro
cess.py", line 1155, in _execute_child
startupinfo)
FileNotFoundError: [WinError 2] Nie można odnaleźć określonego pliku
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in C:\Users\MACIE_~1
\AppData\Local\Temp\pip-install-xybqgvtu\gphoto2\
我怎样才能解决这个问题？