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Unable to execute 'gcc-8': No such file or directory error: command 'gcc-8' failed with exit status 1. PySIT package installation

I am trying to install a package called PySIT to be run with Python, and have followed the instructions on this install page (https://pysit.readthedocs.io/en/latest/install.html) using pip on my terminal to install PySIT.
I am using macOS Catalina for this, and have Anaconda installed on my computer.
This is the output I get on my terminal when I run the command: python setup.py install
gcc-8 -fno-strict-aliasing -I/Users/KBrindha/anaconda2/include -arch x86_64 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/KBrindha/anaconda2/lib/python2.7/site-packages/numpy/core/include -Ipysit/solvers/fd_tools -I/Users/KBrindha/anaconda2/include/python2.7 -c pysit/solvers/constant_density_acoustic/time/scalar/solvers_wrap.cxx -o build/temp.macosx-10.6-x86_64-2.7/pysit/solvers/constant_density_acoustic/time/scalar/solvers_wrap.o -O3 -fopenmp -ffast-math
unable to execute 'gcc-8': No such file or directory
error: command 'gcc-8' failed with exit status 1
Any help on how to bypass this issue or install gcc-8 would be appreciated.
For further information, I have Xcode and Xcode Command Line Tools installed in my computer.
I also have "just" gcc (not gcc-8) installed at /usr/bin/gcc.

The authors inserted fixed names for compilers right into their setup.py. This is a bug and I recommend to report it.
Meanwhile you can clone the repository or download source code, extract it, edit setup.py and remove or replace these fixed names. Then build with the command pip install .

#include <zbar.h> 1 error generated when running pip install zbar

I'm trying to run pip install zbar and for some reason I can't seem to find an answer to solve this dependency issue. Any help would be extremely appreciated. See traceback below:
Downloading/unpacking zbar
Downloading zbar-0.10.tar.bz2
Running setup.py
egg_info for package zbar
Installing collected packages: zbar
Running setup.py install for zbar
building 'zbar' extension
clang -fno-strict-aliasing -fno-common -dynamic -I/usr/local/include -I/usr/local/opt/sqlite/include -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/usr/local/Cellar/python/2.7.7_2/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c zbarmodule.c -o build/temp.macosx-10.9-x86_64-2.7/zbarmodule.o
In file included from zbarmodule.c:24:
./zbarmodule.h:26:10: fatal error: 'zbar.h' file not found
#include <zbar.h>
^
1 error generated.
error: command 'clang' failed with exit status 1
running install
running build
running build_ext
building 'zbar' extension
creating build
creating build/temp.macosx-10.9-x86_64-2.7
clang -fno-strict-aliasing -fno-common -dynamic -I/usr/local/include -I/usr/local/opt/sqlite/include -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/usr/local/Cellar/python/2.7.7_2/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c zbarmodule.c -o build/temp.macosx-10.9-x86_64-2.7/zbarmodule.o
In file included from zbarmodule.c:24:
./zbarmodule.h:26:10: fatal error: 'zbar.h' file not found
include <zbar.h>
^
1 error generated.
error: command 'clang' failed with exit status 1

In my case I was running Ubuntu and had to install libzbar-dev package:
sudo apt-get install libzbar-dev

$ brew install zbar
and after that
$ pip install zbar
The header files will then be found (zbar.h)

Encountered this problem again after 2 years... this is what worked for me
LDFLAGS=-L/usr/local/lib/ CPATH=/usr/local/include/ pip install zbar

In case others run into this issue aren't able to use pip to install zbar for python:
Install zbar: brew install zbar
Install PIL: brew install pillow
Download zbar source: https://pypi.python.org/pypi/zbar
Unzip zbar: tar -xjvf zbar-0.10.tar.bz2
Install: python setup.py install --user

I encountered this issue recently while attempting to launch a service locally from Mac OS in a virtual environment, that imports zbar in the python application. The service was still running python2.7.
Having the service running in a virtual environment I was unwilling to attempt anything that required global system changes.
I solved it by having to install zbar through Homebrew (globally). Then exporting flags or implicit rules used in the C compiling "recipe" to the virtual environment. Finally I installed a similar library to the zbar dependancy in the virtual environment.
$ brew install zbar
Then when sourced in the virtual environment I do the following to change the implicit rules in the c compilation recipe:
$ export LDFLAGS="-L$(brew --prefix zbar)/lib"
$ export CFLAGS="-I$(brew --prefix zbar)/include"
Finally I install a light version of zbar inside the venv:
$ pip install zbarlight
After the above, with the additional dependancy of pyzbar below included in my requirements.txt I am able to import zbar with python2.7 in the virtual environment.
pyzbar==0.1.7
Testing the import in the virtual environment:
$ python
>>> import zbar
>>>
Hope this helps someone in the future. I struggled quite a bit in getting this to work and resources regarding zbar are fairly scarce.

Installing MySQLdb 1.2.3 with Python For Django on Mac OSX?

I am a beginner Java developer and newbie to Python and I want to install Django and from what i understood that i need to install MySQLdb 1.2.3 with Python and I have MySQL already installed so I am trying to do so and all the guides I find is for 1.2.2 and what I did after installing is
sudo python setup.py
and this is what I get
Traceback (most recent call last):
File "setup.py", line 5, in <module>
from setuptools import setup, Extension
ImportError: No module named setuptools
So, is there a simple guide I can follow or a fix to that error to get MySQLdb installed and running ?
By the way I am using Lion.
Update 1 : i've found this tutorial and followed it Here and the result now i get when i run and i've downloaded the version 1.2.2 and did the work on it
python setup.py build
that's what i get
running build
running build_py
copying MySQLdb/release.py -> build/lib.macosx-10.6-intel-2.7/MySQLdb
running build_ext
building '_mysql' extension
gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -isysroot /Developer/SDKs/MacOSX10.6.sdk -g -O2 -DNDEBUG -g -O3 -Dversion_info=(1,2,2,'final',0) -D__version__=1.2.2 -I/usr/local/mysql/include -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c _mysql.c -o build/temp.macosx-10.6-intel-2.7/_mysql.o -Os -g -fno-common -fno-strict-aliasing -arch x86_64
unable to execute gcc-4.2: No such file or directory
error: command 'gcc-4.2' failed with exit status 1
So what can i do ?

You have to make sure that all components were built for the same architecture. A 32 bit MySQL only works with 32bit Python. Unfortunately lion only supports 64bit MySQL.
I just ended up using mariadb. That was much easier than installing MySQL and MySQL_Python.
brew install mariadb
To run django you should also install PIL (Python Image Library), lxml:
sudo pip install PIL
sudo pip install lxml
and gettext (Translations) using brew
brew install gettext

How can I install MySQL-python via pip/virtualenv for Python 2.5 on a Linux system with Python 2.6?

I am trying to set up a virtualenv for a Django project. It needs MySQL-python. I'm trying to replicate the production environment, which uses Python 2.5. My Ubuntu desktop has Python 2.5. I can install the Python 2.5 virtualenv with virtualenv --python=/usr/bin/python2.5 .... However when I try to pip install MySQL-python, I get this output:
$ pip install MySQL-python
Downloading/unpacking MySQL-python
Running setup.py egg_info for package MySQL-python
warning: no files found matching 'MANIFEST'
warning: no files found matching 'ChangeLog'
warning: no files found matching 'GPL'
Installing collected packages: MySQL-python
Running setup.py install for MySQL-python
building '_mysql' extension
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -Dversion_info=(1,2,3,'final',0) -D__version__=1.2.3 -I/usr/include/mysql -I/usr/include/python2.5 -c _mysql.c -o build/temp.linux-i686-2.5/_mysql.o -DBIG_JOINS=1 -fno-strict-aliasing -DUNIV_LINUX -DUNIV_LINUX
In file included from _mysql.c:29:
pymemcompat.h:10: fatal error: Python.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1
I have installed the python-dev Ubuntu deb package, but that's for Python 2.6.
How else can I get MySQL-python installed?

I had this same problem on an Ubuntu box. Prior to installing MySQL-python via pip, I needed to compile the module and dependencies from source using the following command:
sudo apt-get build-dep python-mysqldb
see this article - http://theviceprogrammer.com/?p=238

Actually, found a solution, I enabled the Dead Snakes - old python version repository, then I could aptitude install python2.5-dev, and then pip install MySQL-python worked

Instead of using pip or easy_install, you can use apt-get:
sudo apt-get install python-mysqldb
Requiring from source as per adam's reply wasn't require for me, on Ubuntu 12.04 w/ Python 2.5

Cython Install GCC error

Trying to install Cython on a small VPS running Ubuntu Server. Did
sudo apt-get install gcc
and then
python setup.py install
In the Cython directory, but I get this peculiar error.
running install
running build
running build_py
running build_ext
building 'Cython.Plex.Scanners' extension
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.6 -c Cython/Plex/Scanners.c -o build/temp.linux-x86_64-2.6/Cython/Plex/Scanners.o
Cython/Plex/Scanners.c:4:20: error: Python.h: No such file or directory
Cython/Plex/Scanners.c:6:6: error: #error Python headers needed to compile C extensions, please install development version of Python.
error: command 'gcc' failed with exit status 1
Why should I need a 'development version of Python'? Running Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41). Thanks!

You need the developer version of Python - i.e. the Python header files (Python.h)
sudo apt-get install python-dev

You need the headers included in the development version of Python, i.e. python.h. It should be packaged in Ubuntu as python-dev.