python2.7にcvxpyをinstallしたい

前提・実現したいこと

python2.7にcvxpyをinstallしたいです。
cvxpy1.0.11であればpython2.7に対応しているみたいなのでpip install cvxpy==1.0.11でインストールしようとしたのですがエラーになります。

発生している問題・エラーメッセージ

<省略>
  building 'osqp._osqp' extension
  creating build/temp.linux-x86_64-2.7
  creating build/temp.linux-x86_64-2.7/extension
  creating build/temp.linux-x86_64-2.7/extension/src
  x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-gnDdqE/python2.7-2.7.17=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -DPYTHON -Iosqp_sources/include -Iosqp_sources/lin_sys/direct/qdldl -Iosqp_sources/lin_sys/direct/qdldl/qdldl_sources/include -Iextension/include -I/tmp/pip-build-env-PwsYHN/overlay/lib/python2.7/site-packages/numpy/core/include -I/usr/include/python2.7 -c extension/src/osqpmodule.c -o build/temp.linux-x86_64-2.7/extension/src/osqpmodule.o -O3
  extension/src/osqpmodule.c:33:16: error: variable 'moduledef' has initializer but incomplete type
    static struct PyModuleDef moduledef = {
                  ^~~~~~~~~~~
  extension/src/osqpmodule.c:34:6: error: 'PyModuleDef_HEAD_INIT' undeclared here (not in a function); did you mean 'PyObject_HEAD_INIT'?
        PyModuleDef_HEAD_INIT, "_osqp",       /* m_name */
        ^~~~~~~~~~~~~~~~~~~~~
        PyObject_HEAD_INIT
  extension/src/osqpmodule.c:34:6: warning: excess elements in struct initializer
  extension/src/osqpmodule.c:34:6: note: (near initialization for 'moduledef')
  extension/src/osqpmodule.c:34:29: warning: excess elements in struct initializer
        PyModuleDef_HEAD_INIT, "_osqp",       /* m_name */
                               ^~~~~~~
  extension/src/osqpmodule.c:34:29: note: (near initialization for 'moduledef')
  extension/src/osqpmodule.c:35:6: warning: excess elements in struct initializer
        NULL,                                 /* m_doc */
        ^~~~
  extension/src/osqpmodule.c:35:6: note: (near initialization for 'moduledef')
  extension/src/osqpmodule.c:36:6: warning: excess elements in struct initializer
        -1,                                   /* m_size */
        ^
  extension/src/osqpmodule.c:36:6: note: (near initialization for 'moduledef')
  extension/src/osqpmodule.c:37:6: warning: excess elements in struct initializer
        OSQP_module_methods,                  /* m_methods */
        ^~~~~~~~~~~~~~~~~~~
  extension/src/osqpmodule.c:37:6: note: (near initialization for 'moduledef')
  extension/src/osqpmodule.c:38:6: warning: excess elements in struct initializer
        NULL,                                 /* m_reload */
        ^~~~
  extension/src/osqpmodule.c:38:6: note: (near initialization for 'moduledef')
  extension/src/osqpmodule.c:39:6: warning: excess elements in struct initializer
        NULL,                                 /* m_traverse */
        ^~~~
  extension/src/osqpmodule.c:39:6: note: (near initialization for 'moduledef')
  extension/src/osqpmodule.c:40:6: warning: excess elements in struct initializer
        NULL,                                 /* m_clear */
        ^~~~
  extension/src/osqpmodule.c:40:6: note: (near initialization for 'moduledef')
  extension/src/osqpmodule.c:41:6: warning: excess elements in struct initializer
        NULL,                                 /* m_free */
        ^~~~
  extension/src/osqpmodule.c:41:6: note: (near initialization for 'moduledef')
  extension/src/osqpmodule.c: In function 'moduleinit':
  extension/src/osqpmodule.c:50:9: warning: implicit declaration of function 'PyModule_Create'; did you mean '_PyModule_Clear'? [-Wimplicit-function-declaration]
       m = PyModule_Create(&moduledef);
           ^~~~~~~~~~~~~~~
           _PyModule_Clear
  extension/src/osqpmodule.c:50:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
       m = PyModule_Create(&moduledef);
         ^
  extension/src/osqpmodule.c: In function 'PyInit__osqp':
  extension/src/osqpmodule.c:77:12: warning: 'return' with a value, in function returning void
       return moduleinit();
              ^~~~~~~~~~~~
  extension/src/osqpmodule.c:75:16: note: declared here
   PyMODINIT_FUNC PyInit__osqp(void) {
                  ^~~~~~~~~~~~
  extension/src/osqpmodule.c: At top level:
  extension/src/osqpmodule.c:33:28: error: storage size of 'moduledef' isn't known
    static struct PyModuleDef moduledef = {
                              ^~~~~~~~~
  error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
  ----------------------------------------
  ERROR: Failed building wheel for osqp
Failed to build osqp
ERROR: Could not build wheels for osqp which use PEP 517 and cannot be installed directly