我试图打开Sage的笔记本电脑，但它不起作用。
我不知道这个错误来自哪里，因为笔记本本周正在工作。我猜它刚刚冒出来。
消息的错误是：
sage: notebook()
---------------------------------------------------------------------------
EnvironmentError Traceback (most recent call last)
<ipython-input-4-3728cb3d7c7d> in <module>()
----> 1 notebook()
/home/jerome/opt/SageMath/src/sage/misc/lazy_import.pyx in sage.misc.lazy_import.LazyImport.__call__ (/home/jerome/opt/SageMath/src/build/cythonized/sage/misc/lazy_import.c:3634)()
384 True
385 """
--> 386 return self._get_object()(*args, **kwds)
387
388 def __repr__(self):
/home/jerome/opt/SageMath/src/sage/misc/lazy_import.pyx in sage.misc.lazy_import.LazyImport._get_object (/home/jerome/opt/SageMath/src/build/cythonized/sage/misc/lazy_import.c:2241)()
244 elif self._at_startup and not startup_guard:
245 print('Option ``at_startup=True`` for lazy import {0} not needed anymore'.format(self._name))
--> 246 self._object = getattr(__import__(self._module, {}, {}, [self._name]), self._name)
247 alias = self._as_name or self._name
248 if self._deprecation is not None:
/home/jerome/opt/SageMath/local/lib/python2.7/site-packages/sagenb/notebook/notebook_object.py in <module>()
15 import time, os, shutil, signal, tempfile
16
---> 17 import notebook as _notebook
18
19 import run_notebook
/home/jerome/opt/SageMath/local/lib/python2.7/site-packages/sagenb/notebook/notebook.py in <module>()
33
34 # Sage libraries
---> 35 from sagenb.misc.misc import (pad_zeros, cputime, tmp_dir, load, save,
36 ignore_nonexistent_files, unicode_str)
37
/home/jerome/opt/SageMath/local/lib/python2.7/site-packages/sagenb/misc/misc.py in <module>()
379
380 try:
--> 381 from sage.misc.cython import cython
382 except ImportError:
383 @stub
/home/jerome/opt/SageMath/local/lib/python2.7/site-packages/sage/misc/cython.py in <module>()
28
29 # CBLAS can be one of multiple implementations
---> 30 cblas_pc = pkgconfig.parse('cblas')
31 cblas_libs = list(cblas_pc['libraries'])
32 cblas_library_dirs = list(cblas_pc['library_dirs'])
/home/jerome/opt/SageMath/local/lib/python2.7/site-packages/pkgconfig-1.1.0-py2.7.egg/pkgconfig/pkgconfig.py in parse(packages)
185
186 for package in packages.split():
--> 187 for k, v in parse_package(package).items():
188 result[k].update(v)
189
/home/jerome/opt/SageMath/local/lib/python2.7/site-packages/pkgconfig-1.1.0-py2.7.egg/pkgconfig/pkgconfig.py in parse_package(package)
158
159 # Execute the query to pkg-config and clean the result.
--> 160 out = _query(package, '--cflags --libs')
161 out = out.replace('\\"', '')
162
/home/jerome/opt/SageMath/local/lib/python2.7/site-packages/pkgconfig-1.1.0-py2.7.egg/pkgconfig/pkgconfig.py in _wrapper(*args, **kwargs)
56 return func(*args, **kwargs)
57 except OSError:
---> 58 raise EnvironmentError("pkg-config is not installed")
59
60 return _wrapper
EnvironmentError: pkg-config is not installed
如果你们能帮助我，我会非常感激！