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Failed to install quadprog on Linux Mint 20

has anyone installed this quadprog lib on Python 3.8 and Linux Mint 20? I'm trying to install and the following error is appearing:
pip install quadprog
Collecting quadprog
Using cached quadprog-0.1.8.tar.gz (269 kB)
Requirement already satisfied: Cython in ./anaconda3/lib/python3.8/site-packages (from quadprog) (0.29.21)
Building wheels for collected packages: quadprog
Building wheel for quadprog (setup.py) ... [?25lerror
ERROR: Command errored out with exit status 1:
command: /home/hugosouza/anaconda3/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-8o_4txn2/quadprog_089e8c8a9afa4563849d61ace43b3f03/setup.py'"'"'; __file__='"'"'/tmp/pip-install-8o_4txn2/quadprog_089e8c8a9afa4563849d61ace43b3f03/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-r3kgatse
cwd: /tmp/pip-install-8o_4txn2/quadprog_089e8c8a9afa4563849d61ace43b3f03/
Complete output (12 lines):
running bdist_wheel
running build
running build_ext
skipping 'quadprog/quadprog.cpp' Cython extension (up-to-date)
building 'quadprog' extension
creating build
creating build/temp.linux-x86_64-3.8
creating build/temp.linux-x86_64-3.8/quadprog
gcc -pthread -B /home/hugosouza/anaconda3/compiler_compat -Wl,--sysroot=/ -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -Iquadprog -I/home/hugosouza/anaconda3/include/python3.8 -c quadprog/quadprog.cpp -o build/temp.linux-x86_64-3.8/quadprog/quadprog.o
gcc: fatal error: cannot execute ‘cc1plus’: execvp: Arquivo ou diretório não encontrado
compilation terminated.
error: command 'gcc' failed with exit status 1
----------------------------------------
ERROR: Failed building wheel for quadprog
nning setup.py clean for quadprog
Failed to build quadprog
^C
ERROR: Operation cancelled by user
Note: you may need to restart the kernel to use updated packages.

You need to install g++ or build-essential (which will install g++)
apt-get install g++

Install OpenEXR for python failed

I'm trying to install OpenEXR.
Using :
MacOS 10.14.5
Python 3.6.5
Xcode Version 10.2.1
I tried
pip install openexr
but got the following error:
Collecting openexr
Using cached https://files.pythonhosted.org/packages/7c/c4/76bf884f59d3137847edf8b93aaf40f6257d8315d0064e8b1a606ad80b1b/OpenEXR-1.3.2.tar.gz
Building wheels for collected packages: openexr
Building wheel for openexr (setup.py) ... error
ERROR: Complete output from command /Users/silviojin/anaconda3/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/g9/k_xb1tyd5hbg_48np5hvwh3m0000gn/T/pip-install-0_bh3qoe/openexr/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /private/var/folders/g9/k_xb1tyd5hbg_48np5hvwh3m0000gn/T/pip-wheel-gq2luicr --python-tag cp36:
ERROR: running bdist_wheel
running build
running build_py
creating build
creating build/lib.macosx-10.7-x86_64-3.6
copying Imath.py -> build/lib.macosx-10.7-x86_64-3.6
running build_ext
building 'OpenEXR' extension
creating build/temp.macosx-10.7-x86_64-3.6
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/silviojin/anaconda3/include -arch x86_64 -I/Users/silviojin/anaconda3/include -arch x86_64 -I/usr/include/OpenEXR -I/usr/local/include/OpenEXR -I/opt/local/include/OpenEXR -I/Users/silviojin/anaconda3/include/python3.6m -c OpenEXR.cpp -o build/temp.macosx-10.7-x86_64-3.6/OpenEXR.o -g -DVERSION="1.3.2"
warning: include path for stdlibc++ headers not found; pass '-stdlib=libc++' on the command line to use the libc++ standard library instead [-Wstdlibcxx-not-found]
In file included from OpenEXR.cpp:36:
In file included from /usr/local/include/OpenEXR/ImathBox.h:65:
In file included from /usr/local/include/OpenEXR/ImathVec.h:46:
In file included from /usr/local/include/OpenEXR/ImathExc.h:47:
/usr/local/include/OpenEXR/IexBaseExc.h:49:10: fatal error: 'string' file not found
#include <string>
^~~~~~~~
1 warning and 1 error generated.
error: command 'gcc' failed with exit status 1
----------------------------------------
ERROR: Failed building wheel for openexr
Running setup.py clean for openexr
Failed to build openexr
Installing collected packages: openexr
Running setup.py install for openexr ... error
ERROR: Complete output from command /Users/silviojin/anaconda3/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/g9/k_xb1tyd5hbg_48np5hvwh3m0000gn/T/pip-install-0_bh3qoe/openexr/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/g9/k_xb1tyd5hbg_48np5hvwh3m0000gn/T/pip-record-82it1du_/install-record.txt --single-version-externally-managed --compile:
ERROR: running install
running build
running build_py
creating build
creating build/lib.macosx-10.7-x86_64-3.6
copying Imath.py -> build/lib.macosx-10.7-x86_64-3.6
running build_ext
building 'OpenEXR' extension
creating build/temp.macosx-10.7-x86_64-3.6
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/silviojin/anaconda3/include -arch x86_64 -I/Users/silviojin/anaconda3/include -arch x86_64 -I/usr/include/OpenEXR -I/usr/local/include/OpenEXR -I/opt/local/include/OpenEXR -I/Users/silviojin/anaconda3/include/python3.6m -c OpenEXR.cpp -o build/temp.macosx-10.7-x86_64-3.6/OpenEXR.o -g -DVERSION="1.3.2"
warning: include path for stdlibc++ headers not found; pass '-stdlib=libc++' on the command line to use the libc++ standard library instead [-Wstdlibcxx-not-found]
In file included from OpenEXR.cpp:36:
In file included from /usr/local/include/OpenEXR/ImathBox.h:65:
In file included from /usr/local/include/OpenEXR/ImathVec.h:46:
In file included from /usr/local/include/OpenEXR/ImathExc.h:47:
/usr/local/include/OpenEXR/IexBaseExc.h:49:10: fatal error: 'string' file not found
#include <string>
^~~~~~~~
1 warning and 1 error generated.
error: command 'gcc' failed with exit status 1
----------------------------------------
ERROR: Command "/Users/silviojin/anaconda3/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/g9/k_xb1tyd5hbg_48np5hvwh3m0000gn/T/pip-install-0_bh3qoe/openexr/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/g9/k_xb1tyd5hbg_48np5hvwh3m0000gn/T/pip-record-82it1du_/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/g9/k_xb1tyd5hbg_48np5hvwh3m0000gn/T/pip-install-0_bh3qoe/openexr/
same applies if I try to install other packages like:
https://github.com/jamesbowman/openexrpython
or
pip install pyexr
Then I tried:
brew install openexr
and it installed without errors. But I can't be found when importing in python.
Anyone knows why and how to fix this?
Most installation guide recommend installing via pip but I get the error above. The problem seems that it can't find the stdlibc++?

For me it worked installing OpenEXR via brew first and then directly via git
brew install openexr
pip install git+https://github.com/jamesbowman/openexrpython.git

This solution worked for me:
Create pip env. Mainly, follow https://www.excamera.com/sphinx/articles-openexr.html
sudo port install openexr
Download source code from https://github.com/jamesbowman/openexrpython
cd openexrpython
sudo python setup.py install
cd ..
pip install ./openexrpython

Error while installing oursql in virtualenv

When I try to install oursql under virtual environment using pip install oursql I get following error:
Collecting oursql
Using cached oursql-0.9.3.1.tar.bz2
Building wheels for collected packages: oursql
Running setup.py bdist_wheel for oursql
Complete output from command /home/raghav/janpro/release_1/venv/bin/python2 -c "import setuptools;__file__='/tmp/pip-build-ndxBoY/oursql/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d /tmp/tmpe4k7ejpip-wheel-:
cython not found, using previously-cython'd .c file.
running bdist_wheel
running build
running build_ext
warning: no usable mysql_config and no _winreg module to try; hopefully you have usable CFLAGS/LDFLAGS set.
building 'oursql' extension
creating build
creating build/temp.linux-x86_64-2.7
creating build/temp.linux-x86_64-2.7/oursqlx
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c oursqlx/oursql.c -o build/temp.linux-x86_64-2.7/oursqlx/oursql.o
oursqlx/oursql.c:4:20: fatal error: Python.h: No such file or directory
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
Failed building wheel for oursql
Failed to build oursql
Installing collected packages: oursql
Running setup.py install for oursql
Complete output from command /home/raghav/janpro/release_1/venv/bin/python2 -c "import setuptools, tokenize;__file__='/tmp/pip-build-ndxBoY/oursql/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-awH5dT-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/raghav/janpro/release_1/venv/include/site/python2.7/oursql:
cython not found, using previously-cython'd .c file.
running install
running build
running build_ext
warning: no usable mysql_config and no _winreg module to try; hopefully you have usable CFLAGS/LDFLAGS set.
building 'oursql' extension
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c oursqlx/oursql.c -o build/temp.linux-x86_64-2.7/oursqlx/oursql.o
oursqlx/oursql.c:4:20: fatal error: Python.h: No such file or directory
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
Command "/home/raghav/janpro/release_1/venv/bin/python2 -c "import setuptools, tokenize;__file__='/tmp/pip-build-ndxBoY/oursql/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-awH5dT-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/raghav/janpro/release_1/venv/include/site/python2.7/oursql" failed with error code 1 in /tmp/pip-build-ndxBoY/oursql
Then I installed MySQL C++ connectors with sudo apt-get install libmysqlcppconn-dev but still error was coming.
So, I tried sudo pip install oursql and got following output:
The directory '/home/raghav/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/raghav/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting oursql
Downloading oursql-0.9.3.1.tar.bz2 (119kB)
100% |████████████████████████████████| 122kB 986kB/s
Installing collected packages: oursql
Running setup.py install for oursql
Complete output from command /usr/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip-build-GbfPiA/oursql/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-avSCME-record/install-record.txt --single-version-externally-managed --compile:
cython not found, using previously-cython'd .c file.
running install
running build
running build_ext
warning: no usable mysql_config and no _winreg module to try; hopefully you have usable CFLAGS/LDFLAGS set.
building 'oursql' extension
creating build
creating build/temp.linux-x86_64-2.7
creating build/temp.linux-x86_64-2.7/oursqlx
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c oursqlx/oursql.c -o build/temp.linux-x86_64-2.7/oursqlx/oursql.o
oursqlx/oursql.c:4:20: fatal error: Python.h: No such file or directory
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
Command "/usr/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip-build-GbfPiA/oursql/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-avSCME-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-GbfPiA/oursql
What is going wrong? I am unable to find out.

the directory '/home/raghav/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
I think you installed some library into your virtualenv using sudo pip. So now some files are owned by the root user and your user cannot write there. You never should use virtualenv as root.
If you have a requirements.txt file I think the easiest way is to create a new virtualenv and install everything again. If you don't want/can't do this try to change the permissions with chown

You do not have python development libraries installed. Try installing it first, and then running pip.
sudo apt-get install python2.7-dev

Try this -
$ sudo apt-get install libmysqlclient-dev
$ sudo pip install oursql

Having trouble installing fastcluster library, numpy include error

I'm trying to install the fastcluster Python library, but I'm running into a compilation error.
$ pip install fastcluster
produces the following output:
Collecting fastcluster
Using cached fastcluster-1.1.17.tar.gz
Building wheels for collected packages: fastcluster
Running setup.py bdist_wheel for fastcluster
Complete output from command /home/ruser/dedupe/venv/bin/python -c "import setuptools;__file__='/tmp/pip-build-9ejthV/fastcluster/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d /tmp/tmpXVyTyspip-wheel-:
Version: 1.1.17
running bdist_wheel
running build
running build_py
creating build
creating build/lib.linux-x86_64-2.7
copying fastcluster.py -> build/lib.linux-x86_64-2.7
running build_ext
building '_fastcluster' extension
creating build/temp.linux-x86_64-2.7
creating build/temp.linux-x86_64-2.7/src
x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c src/fastcluster_python.cpp -o build/temp.linux-x86_64-2.7/src/fastcluster_python.o
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++ [enabled by default]
src/fastcluster_python.cpp:38:31: fatal error: numpy/arrayobject.h: No such file or directory
#include <numpy/arrayobject.h>
^
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
Failed building wheel for fastcluster
Failed to build fastcluster
Installing collected packages: fastcluster
Running setup.py install for fastcluster
Complete output from command /home/ruser/dedupe/venv/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip-build-9ejthV/fastcluster/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-85ovHC-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/ruser/dedupe/venv/include/site/python2.7/fastcluster:
Version: 1.1.17
running install
running build
running build_py
running build_ext
building '_fastcluster' extension
x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c src/fastcluster_python.cpp -o build/temp.linux-x86_64-2.7/src/fastcluster_python.o
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++ [enabled by default]
src/fastcluster_python.cpp:38:31: fatal error: numpy/arrayobject.h: No such file or directory
#include <numpy/arrayobject.h>
^
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
Command "/home/ruser/dedupe/venv/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip-build-9ejthV/fastcluster/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-85ovHC-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/ruser/dedupe/venv/include/site/python2.7/fastcluster" failed with error code 1 in /tmp/pip-build-9ejthV/fastcluster
What would cause this? Something about setting include directories?

The issue you're seeing with installing fastcluster is related to this previous question - the compiler is not looking in the correct directory to find the numpy headers. You can use more or less the same solution as given in the accepted answer:
Download and untar the source for fastcluster
$ pip install fastcluster --download='.'
$ tar -xzf fastcluster-1.1.17.tar.gz
$ cd fastcluster-1.1.17/
Edit the setup.py file to add the output of numpy.get_include() to the include_dirs= argument for the Extension:
import numpy
...
ext_modules=[Extension('_fastcluster',
['src/fastcluster_python.cpp'],
extra_compile_args=['/EHsc'] if os.name=='nt' else [],
include_dirs=[numpy.get_include()]
)]
Install fastcluster:
$ python setup.py install
Let the fastcluster maintainer know that his package is broken :-)

How to install python cairo?

I am new to python3. I have created the virtual environment. I try to install the pycairo package using pip command. I need install python cairo. Please see the below info
pip install git+http://anongit.freedesktop.org/git/pycairo
Downloading/unpacking git+http://anongit.freedesktop.org/git/pycairo
Cloning http://anongit.freedesktop.org/git/pycairo to /tmp/pip-0c_foz-build
Running setup.py egg_info for package from git+http://anongit.freedesktop.org/git/pycairo
cairo >= 1.10.2 Successful
Installing collected packages: pycairo
Running setup.py install for pycairo
cairo >= 1.10.2 Successful
building 'cairo._cairo' extension
gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/python3.2mu -c src/cairomodule.c -o build/temp.linux-i686-3.2/src/cairomodule.o
src/cairomodule.c:22:20: fatal error: Python.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1
Complete output from command /home/nyros/Desktop/NewWeb/venv/bin/python3 -c "import setuptools;__file__='/tmp/pip-0c_foz-build/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-lo0egc-record/install-record.txt --single-version-externally-managed --install-headers /home/nyros/Desktop/NewWeb/venv/include/site/python3.2:
cairo >= 1.10.2 Successful
creating py3cairo.pc
creating src/config.h
running install
running build
running build_ext
building 'cairo._cairo' extension
creating build
creating build/temp.linux-i686-3.2
creating build/temp.linux-i686-3.2/src
gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/python3.2mu -c src/cairomodule.c -o build/temp.linux-i686-3.2/src/cairomodule.o
src/cairomodule.c:22:20: fatal error: Python.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1
----------------------------------------
Command /home/nyros/Desktop/NewWeb/venv/bin/python3 -c "import setuptools;__file__='/tmp/pip-0c_foz-build/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-lo0egc-record/install-record.txt --single-version-externally-managed --install-headers /home/nyros/Desktop/NewWeb/venv/include/site/python3.2 failed with error code 1 in /tmp/pip-0c_foz-build
Storing complete log in /home/nyros/.pip/pip.log
But I got the error. Please solve my problem. Thanks

I think this may solve your problem:
sudo apt-get install python3-dev
But I cannot guarantee that this will work 100% :-)