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Unable to install sklearn on macOS

Hi i've trie to install sklearn on macOS but i'm getting an error :
error: Command "gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DUSE_VENDOR_BLAS=1 -Iscipy/sparse/linalg/dsolve/SuperLU/SRC -I/private/var/folders/8x/7jm2njhs7wb7vny_wchsj_q80000gn/T/pip-build-env-95_yvt7g/overlay/lib/python3.9/site-packages/numpy/core/include -c scipy/sparse/linalg/dsolve/SuperLU/SRC/clacon2.c -o build/temp.macosx-10.9-x86_64-3.9/scipy/sparse/linalg/dsolve/SuperLU/SRC/clacon2.o -MMD -MF build/temp.macosx-10.9-x86_64-3.9/scipy/sparse/linalg/dsolve/SuperLU/SRC/clacon2.o.d" failed with exit status 1
----------------------------------------
ERROR: Failed building wheel for scipy
Failed to build scipy
ERROR: Could not build wheels for scipy which use PEP 517 and cannot be installed directly
I'm using python 3.9 and pip 20.2.4 .

According to your error, there is some problem in scipy
Solution
try removing Scipy and again Reinstalling Scipy
references
Scipy Documentation
recent releases
Scipy Pypi

'sdkddkver.h' file not found in pip install MetaTrader5

It happens when i tried to use command "pip install MetaTrader5" on Python 3. I'm using Mac OS. Is there compability issue here?. Because when i tried that pip install command. it throws error :
building 'MetaTrader5.C' extension
creating build/temp.macosx-10.13-x86_64-3.7
creating build/temp.macosx-10.13-x86_64-3.7/src
creating build/temp.macosx-10.13-x86_64-3.7/src/Interprocess
creating build/temp.macosx-10.13-x86_64-3.7/src/Connector
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -DUNICODE -Isrc -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/Users/galihlarasprakoso/Projects/Python/MetaTraderBot/venv/include -I/usr/local/Cellar/python/3.7.2_2/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c src/MetaTrader.cpp -o build/temp.macosx-10.13-x86_64-3.7/src/MetaTrader.o
In file included from src/MetaTrader.cpp:6:
src/stdafx.h:16:10: fatal error: 'sdkddkver.h' file not found
#include <sdkddkver.h>
^~~~~~~~~~~~~
1 error generated.
error: command 'clang' failed with exit status 1
----------------------------------------

I believe you're working with a linux machine. Seems to me like the package was built specifically for windows environment.
Related:
SDKDDKVer.h missing, but WinSDK installed? (c++ header issues)
https://github.com/AudioNet/node-core-audio/issues/4

gcc compiler not recognizing -fno-plt option

I am trying to compile QuantLib Python SWIG bindings on Amazon's EC2 instance with Amazon Linux AMI. I have managed to compile QuantLib itself successfully, however, when trying to compile anaconda python swig bindings, I am getting an error with -fno-plt option. I have upgraded the gcc compiler version to 5.4.0, originally it was 4.8
First I configure as below:
sudo ./configure --disable-perl --disable-ruby --disable-mzscheme --disable-guile --disable-csharp --disable-ocaml --disable-r --disable-java PYTHON=/opt/anaconda/anaconda2/bin/python
Then I make as below:
make -C Python
I get the error :
make: Entering directory `/home/ec2-user/downloads/QuantLib-SWIG-1.8/Python'
make all-am
make[1]: Entering directory `/home/ec2-user/downloads/QuantLib-SWIG-1.8/Python'
CXXFLAGS="-O3 -fno-strict-aliasing -Wno-unused -Wno-uninitialized -Wno-sign-compare -Wno-write-strings" CC="gcc" CXX="g++" /opt/anaconda/anaconda2/bin/python setup.py build
running build
running build_py
running build_ext
building 'QuantLib._QuantLib' extension
gcc -fno-strict-aliasing -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O3 -pipe -DNDEBUG -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/opt/anaconda/anaconda2/include/python2.7 -I/usr/local/include -c QuantLib/quantlib_wrap.cpp -o build/temp.linux-x86_64-2.7/QuantLib/quantlib_wrap.o -Wno-unused -O3 -fno-strict-aliasing -Wno-unused -Wno-uninitialized -Wno-sign-compare -Wno-write-strings
gcc: error: unrecognized command line option ‘-fno-plt’
error: command 'gcc' failed with exit status 1
make[1]: *** [.build-stamp] Error 1
make[1]: Leaving directory `/home/ec2-user/downloads/QuantLib-SWIG-1.8/Python'
make: *** [all] Error 2
make: Leaving directory `/home/ec2-user/downloads/QuantLib-SWIG-1.8/Python'
I am very new to this and do not know if I can remove -fno-plt option when compiling and if yes, how?

You need to upgrade your GCC version.
The changelog page for GCC 6 says:
The option -fno-plt is now fully functional.
Thus, from GCC 6 you can use it.

aspell-python installation error

I am trying to install aspell-python package for spell correction.
Facing problem while installing the package.
Error :
python setup.py install
running install
running build
running build_ext
building 'aspell' extension
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c aspell.c -o build/temp.linux-i686-2.7/aspell.o
aspell.c:53:20: fatal error: aspell.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1
GCC is already install version gcc (Ubuntu/Linaro 4.7.2-2ubuntu1) 4.7.2
libaspell15 is already install

Need to install sudo apt-get install libaspell-dev

Set default compiler for linking C code in Python package

I'm trying to compile a Python package which has some Cython-generated C code, and I'm running into:
gcc: error: x86_64: No such file or directory
which indicates that the gcc compiler is too recent, so doesn't support -arch anymore. I tried setting CC=/usr/bin/gcc prior to python setup.py install, and this works for the main compile command, but not for the command to make the shared object library:
% setenv CC /usr/bin/gcc
% python setup.py install
running install
running build
running build_py
running build_ext
skipping 'hyperion/util/integrate_core.c' Cython extension (up-to-date)
building 'hyperion.util.integrate_core' extension
/usr/bin/gcc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.5.sdk -DNDEBUG -g -O3 -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.5.sdk -I/Library/Frameworks/EPD64.framework/Versions/7.2/lib/python2.7/site-packages/numpy/core/include -I/Library/Frameworks/EPD64.framework/Versions/7.2/include/python2.7 -c hyperion/util/integrate_core.c -o build/temp.macosx-10.5-x86_64-2.7/hyperion/util/integrate_core.o
gcc -bundle -undefined dynamic_lookup -g -arch x86_64 -arch x86_64 build/temp.macosx-10.5-x86_64-2.7/hyperion/util/integrate_core.o -o build/lib.macosx-10.5-x86_64-2.7/hyperion/util/integrate_core.so
gcc: error: x86_64: No such file or directory
gcc: error: x86_64: No such file or directory
gcc: error: unrecognized option ‘-arch’
gcc: error: unrecognized option ‘-arch’
error: command 'gcc' failed with exit status 1
Is there a way to specify the absolute path of the compiler to use for linking?

Use LDSHARED variable: LDSHARED='/usr/bin/gcc -shared'.
It's buried in sysconfig module. Try this:
>>> from sysconfig import get_config_vars
>>> get_config_vars('CC', 'CXX', 'LDSHARED')

I've done it like so:
CXX="/Developer/usr/bin/g++-4.0" CC="/Developer/usr/bin/gcc-4.0" python setup.py build
but I'm not sure that's "right"; it's just part of a long command I need to use when installing scipy/numpy.
(full command I end up using is
LD_LIBRARY_PATH=/Developer/SDKs/MacOSX10.6.sdk/usr/lib/ FFLAGS="-m64" CFLAGS="-arch x86_64 -I/Developer/SDKs/MacOSX10.6.sdk/usr/lib/gcc/i686-apple-darwin10/4.0.1/ -I/usr/local/include/freetype2 -I/usr/X11/include -L/usr/X11/lib" LDFLAGS="-Wall -undefined dynamic_lookup -bundle -lpng -arch x86_64" CXX="/Developer/usr/bin/g++-4.0" CC="/Developer/usr/bin/gcc-4.0" python setup.py build)