Command line tools and gcc errors during installation on macOS Catalina

[RyanRizzo96]

Describe the bug
Command Line tools and gcc are giving a multitude of errors when trying to install MuJoCo. It seems like the python library was developed against a different set of headers and the python library‘s C extension is outdated.

To Reproduce
pip3 install 'mujoco-py<2.1,>=2.0' on Catalina

Expected behavior
Installs successfully.

Error Messages

   /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/sys/resource.h:443:34:
     error: expected declaration specifiers before
     '__OSX_AVAILABLE_STARTING'    int     getiopolicy_np(int, int)
     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
                                         ^~~~~~~~~~~~~~~~~~~~~~~~

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  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdlib.h:144:1: error: expected declaration specifiers before 'div_t'
   div_t  div(int, int) __pure2;
   ^~~~~

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In file included from /Users/ryanr/.mujoco/mujoco200/include/mujoco.h:42:0,
                   from /private/var/folders/q7/q_59j36d5n31209r5c01mx2w0000gp/T/pip-install-4_wykvnc/mujoco-py/mujoco_py/gl/glshim.h:4,
                   from /private/var/folders/q7/q_59j36d5n31209r5c01mx2w0000gp/T/pip-install-4_wykvnc/mujoco-py/mujoco_py/gl/dummyshim.c:1:
  /Users/ryanr/.mujoco/mujoco200/include/mjui.h:54:3: error: storage class specified for parameter 'mjtButton'
   } mjtButton;
     ^~~~~~~~~
  /Users/ryanr/.mujoco/mujoco200/include/mjui.h:66:3: error: storage class specified for parameter 'mjtEvent'
   } mjtEvent;
     ^~~~~~~~
  /Users/ryanr/.mujoco/mujoco200/include/mjui.h:89:3: error: storage class specified for parameter 'mjtItem'
   } mjtItem;
     ^~~~~~~
  /Users/ryanr/.mujoco/mujoco200/include/mjui.h:93:15: error: storage class specified for parameter 'mjfItemEnable'
   typedef int (*mjfItemEnable)(int category, void* data);
                 ^~~~~~~~~~~~~
  /Users/ryanr/.mujoco/mujoco200/include/mjui.h:100:5: error: expected specifier-qualifier-list before 'mjrRect'
       mjrRect rect[mjMAXUIRECT];  // rectangles (index 0: entire window)
       ^~~~~~~

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In file included from /Users/ryanr/.mujoco/mujoco200/include/mujoco.h:34:0,
                   from /private/var/folders/q7/q_59j36d5n31209r5c01mx2w0000gp/T/pip-install-4_wykvnc/mujoco-py/mujoco_py/gl/glshim.h:4,
                   from /private/var/folders/q7/q_59j36d5n31209r5c01mx2w0000gp/T/pip-install-4_wykvnc/mujoco-py/mujoco_py/gl/dummyshim.c:1:
  /usr/local/Cellar/gcc@6/6.5.0_2/lib/gcc/6/gcc/x86_64-apple-darwin18.5.0/6.5.0/include-fixed/math.h:59:19: error: storage class specified for parameter 'float_t'
       typedef float float_t;
                     ^~~~~~~
  /usr/local/Cellar/gcc@6/6.5.0_2/lib/gcc/6/gcc/x86_64-apple-darwin18.5.0/6.5.0/include-fixed/math.h:60:20: error: storage class specified for parameter 'double_t'
       typedef double double_t;
                      ^~~~~~~~
  /usr/local/Cellar/gcc@6/6.5.0_2/lib/gcc/6/gcc/x86_64-apple-darwin18.5.0/6.5.0/include-fixed/math.h:126:12: error: storage class specified for parameter '__math_errhandling'
   extern int __math_errhandling(void);
              ^~~~~~~~~~~~~~~~~~
  /usr/local/Cellar/gcc@6/6.5.0_2/lib/gcc/6/gcc/x86_64-apple-darwin18.5.0/6.5.0/include-fixed/math.h:146:12: error: storage class specified for parameter '__fpclassifyf'
   extern int __fpclassifyf(float);
              ^~~~~~~~~~~~~
  /usr/local/Cellar/gcc@6/6.5.0_2/lib/gcc/6/gcc/x86_64-apple-darwin18.5.0/6.5.0/include-fixed/math.h:147:12: error: storage class specified for parameter '__fpclassifyd'
   extern int __fpclassifyd(double);
              ^~~~~~~~~~~~~
  /usr/local/Cellar/gcc@6/6.5.0_2/lib/gcc/6/gcc/x86_64-apple-darwin18.5.0/6.5.0/include-fixed/math.h:148:12: error: storage class specified for parameter '__fpclassifyl'
   extern int __fpclassifyl(long double);
              ^~~~~~~~~~~~~

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  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/sys/wait.h:110:0,
                   from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdlib.h:66,
                   from /Users/ryanr/.mujoco/mujoco200/include/mujoco.h:33,
                   from /private/var/folders/q7/q_59j36d5n31209r5c01mx2w0000gp/T/pip-install-jye6hn52/mujoco-py/mujoco_py/gl/glshim.h:4,
                   from /private/var/folders/q7/q_59j36d5n31209r5c01mx2w0000gp/T/pip-install-jye6hn52/mujoco-py/mujoco_py/gl/dummyshim.c:1:
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/sys/resource.h:443:9: error: old-style parameter declarations in prototyped function definition
   int     getiopolicy_np(int, int) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
           ^~~~~~~~~~~~~~
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/sys/resource.h:443:1: error: parameter name omitted
   int     getiopolicy_np(int, int) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
   ^~~
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/sys/resource.h:443:1: error: parameter name omitted
  /private/var/folders/q7/q_59j36d5n31209r5c01mx2w0000gp/T/pip-install-jye6hn52/mujoco-py/mujoco_py/gl/dummyshim.c:37:1: error: expected '{' at end of input
   }
   ^
  error: command '/usr/local/bin/gcc-6' failed with exit status 1
  ----------------------------------------
  ERROR: Failed building wheel for mujoco-py

Desktop (please complete the following information):

• OS: [e.g. macOS 10.15]
• Python Version [3.7.4]
• Mujoco Version [2.00]
• mujoco-py version [2.0.2.7]
• gcc [gcc@6,7,8, all fail]

I am completely unable to use mujoco-py on macOS Catalina. Any help would be very appreciated.

Similar stack overflow questions:

https://apple.stackexchange.com/questions/372311/macos-catalina-command-line-tools-and-gcc-errors-during-installation

The answer here states:

It is not your command line tools which are failing. Quite obvious, this is a compiler error and it seems like the python library was developed against a different set of headers - the compiler merely states a mismatch.

So gcc is working as expected - the python library‘s C extension is outdated.

[andyk]

Bump. I'm having same issues (seeing the same errors when trying to build Mujoco 2.00 on Catalina). Thanks @RyanRizzo96 for doing all the legwork for reporting this so far.

[RyanRizzo96]

Have you seen issue #463?

[Jendker]

Million thanks @matthiasplappert! This closes this issue and all the related issues with MacOS Catalina created by @RyanRizzo96

[YangRui2015]

Same problem. I used Python 3.6.6, mujoco-py 2.0.2.9, mujoco200, gcc 8.2 and my MuJoCo-py was installed by source. When I imported mujoco_py, I get the same error. However, after I updated gcc to 9.2.0, it disappeared.

The following settings worked for me.

OS: [MacOS Catallina 10.15.2]
Python Version [3.6.6]
Mujoco Version [mujoco200]
mujoco-py version [2.0.2.9]
gcc version [9.2.0]

[piojanu]

I have the same problem with gcc 9.3.0 :( Help!

Configuration:

OS: [MacOS Catallina 10.15.3]
Python Version [3.6.9/3.7.7]
Mujoco Version [mujoco200]
mujoco-py version [2.0.2.9]
gcc version [9.3.0]

Trace:

➜ pip install mujoco-py
Collecting mujoco-py
  Using cached mujoco-py-2.0.2.9.tar.gz (777 kB)
  Installing build dependencies ... done
  WARNING: Missing build requirements in pyproject.toml for mujoco-py from https://files.pythonhosted.org/packages/a2/30/21abd0cf2734bf5f34a7a8967789b12dee55f1e51e9c1c60af1cba549123/mujoco-py-2.0.2.9.tar.gz#sha256=6ae20ca9509203758f5e30a7a4019cb2d581b6d40dc2c2669dbe3229cfdf05e8.
  WARNING: The project does not specify a build backend, and pip cannot fall back to setuptools without 'wheel'.
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
    Preparing wheel metadata ... done

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Building wheels for collected packages: mujoco-py
  Building wheel for mujoco-py (PEP 517) ... error
  ERROR: Command errored out with exit status 1:
   command: /Users/piotr/anaconda3/envs/SpinUp/bin/python /Users/piotr/anaconda3/envs/SpinUp/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py build_wheel /var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/tmphk6wwt2c
       cwd: /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py
  Complete output (2377 lines):
  running bdist_wheel
  running build
  Removing old mujoco_py cext /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/cymj_2.0.2.9_37_macextensionbuilder_37.so
  Compiling /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/cymj.pyx because it depends on /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-build-env-xp2haxum/overlay/lib/python3.7/site-packages/Cython/Includes/numpy/__init__.pxd.
  [1/1] Cythonizing /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/cymj.pyx
  running build_ext
  building 'mujoco_py.cymj' extension
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var/folders
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var/folders/9l
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py
  creating /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/gl
  /usr/local/bin/gcc-9 -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -I/Users/piotr/anaconda3/envs/SpinUp/include -arch x86_64 -I/Users/piotr/anaconda3/envs/SpinUp/include -arch x86_64 -DONMAC -Imujoco_py -I/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py -I/Users/piotr/.mujoco/mujoco200/include -I/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-build-env-xp2haxum/overlay/lib/python3.7/site-packages/numpy/core/include -I/Users/piotr/anaconda3/envs/SpinUp/include/python3.7m -c /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/cymj.c -o /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/cymj.o -fopenmp -w
  /usr/local/bin/gcc-9 -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -I/Users/piotr/anaconda3/envs/SpinUp/include -arch x86_64 -I/Users/piotr/anaconda3/envs/SpinUp/include -arch x86_64 -DONMAC -Imujoco_py -I/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py -I/Users/piotr/.mujoco/mujoco200/include -I/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-build-env-xp2haxum/overlay/lib/python3.7/site-packages/numpy/core/include -I/Users/piotr/anaconda3/envs/SpinUp/include/python3.7m -c /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/gl/dummyshim.c -o /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/generated/_pyxbld_2.0.2.9_37_macextensionbuilder/temp.macosx-10.9-x86_64-3.7/private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/gl/dummyshim.o -fopenmp -w
  In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/wait.h:110,
                   from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/stdlib.h:66,
                   from /Users/piotr/.mujoco/mujoco200/include/mujoco.h:33,
                   from /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/gl/glshim.h:4,
                   from /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/gl/dummyshim.c:1:
  /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/resource.h: In function 'getiopolicy_np':
  /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/resource.h:443:34: error: expected declaration specifiers before '__OSX_AVAILABLE_STARTING'
    443 | int     getiopolicy_np(int, int) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
        |                                  ^~~~~~~~~~~~~~~~~~~~~~~~
  /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/resource.h:449:39: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__OSX_AVAILABLE_STARTING'
    449 | int     setiopolicy_np(int, int, int) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
        |                                       ^~~~~~~~~~~~~~~~~~~~~~~~
  In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/libkern/_OSByteOrder.h:66,
                   from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_endian.h:130,
                   from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/i386/endian.h:99,
                   from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/machine/endian.h:35,
                   from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/wait.h:186,
                   from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/stdlib.h:66,
                   from /Users/piotr/.mujoco/mujoco200/include/mujoco.h:33,
                   from /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/gl/glshim.h:4,
                   from /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/gl/dummyshim.c:1:
  /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/libkern/i386/_OSByteOrder.h:49:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
     49 | {
        | ^
  /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/libkern/i386/_OSByteOrder.h:58:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
     58 | {
        | ^
  /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/libkern/i386/_OSByteOrder.h:96:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
     96 | {
        | ^
  In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/stdlib.h:77,
                   from /Users/piotr/.mujoco/mujoco200/include/mujoco.h:33,
                   from /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/gl/glshim.h:4,
                   from /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/gl/dummyshim.c:1:

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/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/resource.h:443:29: error: parameter name omitted
    443 | int     getiopolicy_np(int, int) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
        |                             ^~~
  /private/var/folders/9l/r3_05sd15p7fn3vf7t8wd47m0000gn/T/pip-install-wkh0_493/mujoco-py/mujoco_py/gl/dummyshim.c:37: error: expected '{' at end of input
     37 | }
        |
  error: command '/usr/local/bin/gcc-9' failed with exit status 1
  ----------------------------------------
  ERROR: Failed building wheel for mujoco-py
Failed to build mujoco-py
ERROR: Could not build wheels for mujoco-py which use PEP 517 and cannot be installed directly

[ahmarz]

@piojanu any updates ? I have the same issue

[piojanu]

@ahmarz I just gave up.

[piojanu]

@ahmarz I found a solution. Simply remove gcc (I couldn't make it work, I couldn't downgrade to some working version, I simply gave up with it, for your sanity health delete it) and follow this WA.

Step by step (based on WA from the link):

1. Uninstall gcc: brew uninstall gcc
   You may need to run it a couple of times if you have more than one version.
2. Install clang/llvm: brew install llvm boost hdf5
   I don't know if boost and hdf5 are required, but I installed it as ordered.
3. Add this to your .bashrc/.zshrc:

export PATH="/usr/local/opt/llvm/bin:$PATH"
export CC="/usr/local/opt/llvm/bin/clang"
export CXX="/usr/local/opt/llvm/bin/clang++"
export CXX11="/usr/local/opt/llvm/bin/clang++"
export CXX14="/usr/local/opt/llvm/bin/clang++"
export CXX17="/usr/local/opt/llvm/bin/clang++"
export CXX1X="/usr/local/opt/llvm/bin/clang++"
export LDFLAGS="-L/usr/local/opt/llvm/lib"
export CPPFLAGS="-I/usr/local/opt/llvm/include"

4. Don't forget to source your .bashrc/.zshrc after editing it and make sure your python environment is activated.
5. Try to install mujoco-py again:

$ pip install -U 'mujoco-py<2.1,>=2.0'
$ python -c "import mujoco_py"

Voilà!

[empty-id]

Hi, I used your solution on MacOS Catalina. But still facing a problem like #495 @piojanu

[piojanu]

@NULL-id I used Anaconda with Python 3.7.7. Moreover, I don't think these warnings from the issue are a problem. I see them too and I'm still able to use MuJoCo OpenAI Gym environments. See my ipython session example:

Python 3.7.7 (default, Mar 26 2020, 10:32:53)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.13.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import mujoco_py
objc[99575]: Class GLFWApplicationDelegate is implemented in both /Users/piotr/.mujoco/mjpro150/bin/libglfw.3.dylib (0x11781f778) and /Users/piotr/anaconda3/envs/SpinUp/lib/python3.7/site-packages/glfw-1.11.0-py3.7-macosx-10.9-x86_64.egg/glfw/libglfw.3.dylib (0x1178f36e8). One of the two will be used. Which one is undefined.
objc[99575]: Class GLFWWindowDelegate is implemented in both /Users/piotr/.mujoco/mjpro150/bin/libglfw.3.dylib (0x11781f700) and /Users/piotr/anaconda3/envs/SpinUp/lib/python3.7/site-packages/glfw-1.11.0-py3.7-macosx-10.9-x86_64.egg/glfw/libglfw.3.dylib (0x1178f3710). One of the two will be used. Which one is undefined.
objc[99575]: Class GLFWContentView is implemented in both /Users/piotr/.mujoco/mjpro150/bin/libglfw.3.dylib (0x11781f7a0) and /Users/piotr/anaconda3/envs/SpinUp/lib/python3.7/site-packages/glfw-1.11.0-py3.7-macosx-10.9-x86_64.egg/glfw/libglfw.3.dylib (0x1178f3760). One of the two will be used. Which one is undefined.
objc[99575]: Class GLFWWindow is implemented in both /Users/piotr/.mujoco/mjpro150/bin/libglfw.3.dylib (0x11781f818) and /Users/piotr/anaconda3/envs/SpinUp/lib/python3.7/site-packages/glfw-1.11.0-py3.7-macosx-10.9-x86_64.egg/glfw/libglfw.3.dylib (0x1178f37d8). One of the two will be used. Which one is undefined.

In [2]: import gym

In [3]: env = gym.make('HalfCheetah-v2')

In [4]: env.reset()
Out[4]:
array([ 0.0228056 , -0.01409458,  0.07844352,  0.04524467,  0.09728677,
        0.04553284, -0.07546735, -0.04468718, -0.01352164,  0.18370665,
       -0.15241323, -0.02871676, -0.05958594, -0.08736752,  0.17731656,
        0.0478807 , -0.03618564])

[empty-id]

Thanks @piojanu . I just realized that my real problem was using a wrong license file. Now it's OK!

[quinnliu]

@piojanu Your solution appears to be working on MacOS 10.15.7 with python 3.7.3 in virtual environment && pip 20.3.3

No other solutions I've found have worked. I do not know why but I think uninstalling all versions of gcc several times was the missing step that prevented your strategy from working the first time.