i used this
git clone https://github.com/indico/indico.git src

I still need a dev environment as there are a some translation fixes and custom menu etc.,

thanks

ERROR: pip's legacy dependency resolver does not consider dependency conflicts when selecting packages. This behaviour is the source of the following dependency conflicts.
sphinx-rtd-theme 0.5.2 requires docutils<0.17, but you'll have docutils 0.17.1 which is incompatible.

i did recreate but

Building wheel for psycopg2 (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /opt/indico/dev/indico/env/bin/python2.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-SD5fkr/psycopg2/setup.py'"'"'; __file__='"'"'/tmp/pip-install-SD5fkr/psycopg2/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-fUIw1h
       cwd: /tmp/pip-install-SD5fkr/psycopg2/

(env) [indico@localhost indico]$ pip install psycopg2
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality.
Collecting psycopg2
  Using cached psycopg2-2.8.6.tar.gz (383 kB)
Building wheels for collected packages: psycopg2
  Building wheel for psycopg2 (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /opt/indico/dev/indico/env/bin/python2.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-aChxRK/psycopg2/setup.py'"'"'; __file__='"'"'/tmp/pip-install-aChxRK/psycopg2/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-wLh08e
       cwd: /tmp/pip-install-aChxRK/psycopg2/
  Complete output (40 lines):
              
[indico@localhost indico] source ./env/bin/activate
(env) [indico@localhost indico] pip install psycopg2

DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at Release process - pip documentation v21.1.dev0 pip 21.0 will remove support for this functionality.

Collecting psycopg2

Using cached psycopg2-2.8.6.tar.gz (383 kB)

Building wheels for collected packages: psycopg2

Building wheel for psycopg2 (setup.py) … error

ERROR: Command errored out with exit status 1:

command: /opt/indico/dev/indico/env/bin/python2.7 -u -c ‘import sys, setuptools, tokenize; sys.argv[0] = ‘"’"’/tmp/pip-install-aChxRK/psycopg2/setup.py’"’"’; file=’"’"’/tmp/pip-install-aChxRK/psycopg2/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-wLh08e

cwd: /tmp/pip-install-aChxRK/psycopg2/

Complete output (40 lines):

running bdist_wheel

running build

running build_py

creating build

creating build/lib.linux-x86_64-2.7

creating build/lib.linux-x86_64-2.7/psycopg2

copying lib/extensions.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/_range.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/init.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/_lru_cache.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/errorcodes.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/tz.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/pool.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/errors.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/_json.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/sql.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/compat.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/_ipaddress.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/extras.py → build/lib.linux-x86_64-2.7/psycopg2

running build_ext

building ‘psycopg2._psycopg’ extension

creating build/temp.linux-x86_64-2.7

creating build/temp.linux-x86_64-2.7/psycopg

gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -DPSYCOPG_VERSION=2.8.6 (dt dec pq3 ext) -DPG_VERSION_NUM=90224 -I/usr/include/python2.7 -I. -I/usr/include -I/usr/include/pgsql/server -c psycopg/psycopgmodule.c -o build/temp.linux-x86_64-2.7/psycopg/psycopgmodule.o -Wdeclaration-after-statement

In file included from psycopg/psycopgmodule.c:28:0:

./psycopg/psycopg.h:36:22: fatal error: libpq-fe.h: No such file or directory

#include <libpq-fe.h>

compilation terminated.
It appears you are missing some prerequisite to build the package from source.
You may install a binary package by installing ‘psycopg2-binary’ from PyPI.

If you want to install psycopg2 from source, please install the packages

required for the build and try again.
For further information please check the ‘doc/src/install.rst’ file (also at

https://www.psycopg.org/docs/install.html).
error: command ‘gcc’ failed with exit status 1
ERROR: Failed building wheel for psycopg2

Running setup.py clean for psycopg2

Failed to build psycopg2

Installing collected packages: psycopg2

Running setup.py install for psycopg2 … error

ERROR: Command errored out with exit status 1:

command: /opt/indico/dev/indico/env/bin/python2.7 -u -c ‘import sys, setuptools, tokenize; sys.argv[0] = ‘"’"’/tmp/pip-install-aChxRK/psycopg2/setup.py’"’"’; file=’"’"’/tmp/pip-install-aChxRK/psycopg2/setup.py’"’"’;f=getattr(tokenize, ‘"’"‘open’"’"’, open)(file);code=f.read().replace(’"’"’\r\n’"’"’, ‘"’"’\n’"’"’);f.close();exec(compile(code, file, ‘"’"‘exec’"’"’))’ install --record /tmp/pip-record-xyTxQ3/install-record.txt --single-version-externally-managed --compile --install-headers /opt/indico/dev/indico/env/include/site/python2.7/psycopg2

cwd: /tmp/pip-install-aChxRK/psycopg2/

Complete output (40 lines):

running install

running build

running build_py

creating build

creating build/lib.linux-x86_64-2.7

creating build/lib.linux-x86_64-2.7/psycopg2

copying lib/extensions.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/_range.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/init.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/_lru_cache.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/errorcodes.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/tz.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/pool.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/errors.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/_json.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/sql.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/compat.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/_ipaddress.py → build/lib.linux-x86_64-2.7/psycopg2

copying lib/extras.py → build/lib.linux-x86_64-2.7/psycopg2

running build_ext

building ‘psycopg2._psycopg’ extension

creating build/temp.linux-x86_64-2.7

creating build/temp.linux-x86_64-2.7/psycopg

gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -DPSYCOPG_VERSION=2.8.6 (dt dec pq3 ext) -DPG_VERSION_NUM=90224 -I/usr/include/python2.7 -I. -I/usr/include -I/usr/include/pgsql/server -c psycopg/psycopgmodule.c -o build/temp.linux-x86_64-2.7/psycopg/psycopgmodule.o -Wdeclaration-after-statement

In file included from psycopg/psycopgmodule.c:28:0:

./psycopg/psycopg.h:36:22: fatal error: libpq-fe.h: No such file or directory

#include <libpq-fe.h>

compilation terminated.
It appears you are missing some prerequisite to build the package from source.
You may install a binary package by installing 'psycopg2-binary' from PyPI.
If you want to install psycopg2 from source, please install the packages
required for the build and try again.
For further information please check the 'doc/src/install.rst' file (also at
<https://www.psycopg.org/docs/install.html>).
error: command 'gcc' failed with exit status 1
----------------------------------------
ERROR: Command errored out with exit status 1: /opt/indico/dev/indico/env/bin/python2.7 -u -c ‘import sys, setuptools, tokenize; sys.argv[0] = ‘"’"’/tmp/pip-install-aChxRK/psycopg2/setup.py’"’"’; file=’"’"’/tmp/pip-install-aChxRK/psycopg2/setup.py’"’"’;f=getattr(tokenize, ‘"’"‘open’"’"’, open)(file);code=f.read().replace(’"’"’\r\n’"’"’, ‘"’"’\n’"’"’);f.close();exec(compile(code, file, ‘"’"‘exec’"’"’))’ install --record /tmp/pip-record-xyTxQ3/install-record.txt --single-version-externally-managed --compile --install-headers /opt/indico/dev/indico/env/include/site/python2.7/psycopg2 Check the logs for full command output.
              
hi, I managed to install Indico Dev in Centos 7 using following set of commands
yum install epel-release
yum update
sudo yum -y install https://packages.endpoint.com/rhel/7/os/x86_64/endpoint-repo-1.7-1.x86_64.rpm
sudo yum install git
sudo vi /etc/yum.repos.d/CentOS-Base.repo
Find the [base] and [updates] sections, enter insert mode by pressing i, and insert the exclude=postgresql* line in both sections. As a result, your file will look like the following, with
sudo yum install https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
yum list postgresql*
sudo yum install postgresql96-server
sudo yum install postgresql96-contrib postgresql96-devel
systemctl start redis.service postgresql-9.6.service
sudo /usr/pgsql-9.6/bin/postgresql96-setup initdb
yum install -y gcc redis python-devel python-virtualenv libjpeg-turbo-devel libxslt-devel libxml2-devel libffi-devel pcre-devel libyaml-devel redhat-rpm-config libpq-devel
yum install httpd
useradd -rm -g apache -d /opt/indico -s /bin/bash indico
passwd indico
usermod -aG wheel indico
curl -sL https://rpm.nodesource.com/setup_10.x | sudo bash -
sudo yum install nodejs
yum install watchdog
yum install python-docutils
yum groupinstall "Development Tools"
yum install python-psycopg2
yum install libpq
yum install libpq5-devel
su - indico
mkdir -p ~/dev/indico/data
cd ~/dev/indico
virtualenv env -p /usr/bin/python2.7
git clone https://github.com/indico/indico.git src
mkdir plugins
git clone https://github.com/indico/indico-plugins.git plugins/base
git clone https://github.com/indico/indico-user-docs.git user-docs
cd src
git checkout 2.3-maintenance
sudo -u postgres createuser $USER --createdb
sudo -u postgres createdb indico_template -O $USER
sudo -u postgres psql indico_template -c "CREATE EXTENSION unaccent; CREATE EXTENSION pg_trgm;"
createdb indico -T indico_template
source ./env/bin/activate
pip install -U pip setuptools
cd src
pip install psycopg2-binary
pip install -r requirements.dev.txt
pip install pyrsistent==0.16.1
pip install -e .
npm ci
indico setup wizard --dev
indico db prepare
indico i18n compile-catalog
indico i18n compile-catalog-react
but when I run it with
(env) [indico@localhost src]$ indico run -h 10.10.10.106 -q --enable-evalex
 * Serving Indico on http://10.10.10.106:8000
 * Werkzeug debugger console on http://10.10.10.106:8000/console
 * Werkzeug debugger console is available to all clients!
 * Running on http://10.10.10.106:8000/ (Press CTRL+C to quit)
accessing http://10.10.10.106:8000 timed out. Looking at indico log at (/opt/indico/dev/indico/data/log/indico.log)  shows me only following
2021-04-27 04:34:32,443  ERROR    0000000000000000  -       indico.i18n               Configured DEFAULT_LOCALE (en_GB) does not exist
              
The message about the locale is weird, en_GB should exist as long as you executed indico i18n compile-catalog before starting indico. Anyway, the warning is harmless and safe to ignore.
If you get a timeout it sounds like the issue is not related to indico but maybe your local firewall?
              
i did add port 8000 on firewall
[root@localhost ~]# firewall-cmd --permanent --add-port=8000/tcp

success

[root@localhost ~]# firewall-cmd --reload

success
following errors are flooding on watch terminal
Error from chokidar (/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Size2/Regular): Error: ENOSPC: System limit for number of file watchers reached, watch ‘/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Size2/Regular/Main.js’

Error from chokidar (/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Size3/Regular): Error: ENOSPC: System limit for number of file watchers reached, watch ‘/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Size3/Regular/Main.js’

Error from chokidar (/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Size4/Regular): Error: ENOSPC: System limit for number of file watchers reached, watch ‘/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Size4/Regular/Main.js’

Error from chokidar (/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Typewriter/Regular): Error: ENOSPC: System limit for number of file watchers reached, watch ‘/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Typewriter/Regular/BasicLatin.js’

Error from chokidar (/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Typewriter/Regular): Error: ENOSPC: System limit for number of file watchers reached, watch ‘/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Typewriter/Regular/CombDiacritMarks.js’

Error from chokidar (/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Typewriter/Regular): Error: ENOSPC: System limit for number of file watchers reached, watch ‘/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Typewriter/Regular/Main.js’

Error from chokidar (/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Typewriter/Regular): Error: ENOSPC: System limit for number of file watchers reached, watch ‘/opt/indico/dev/indico/src/node_modules/mathjax/unpacked/jax/output/SVG/fonts/TeX/Typewriter/Regular/Other.js’
[root@localhost ~]# nmap 10.10.10.106
Starting Nmap 6.40 ( http://nmap.org ) at 2021-04-27 07:55 EDT

Nmap scan report for 10.10.10.106

Host is up (0.000024s latency).

Not shown: 996 closed ports

PORT     STATE SERVICE

22/tcp   open  ssh

80/tcp   open  http

443/tcp  open  https

8000/tcp open  http-alt
Nmap done: 1 IP address (1 host up) scanned in 1.92 seconds
              
my 5th attempt was success. Now I have got the dev running. Following is the exact set of commands I used to get it running.

PS: There was only 1 error as follows
ERROR: pip’s legacy dependency resolver does not consider dependency conflicts when selecting packages. This behaviour is the source of the following dependency conflicts.

sphinx-rtd-theme 0.5.2 requires docutils<0.17, but you’ll have docutils 0.17.1 which is incompatible.
but still it got the dev console running
List of commands:
yum install epel-release

yum update

sudo yum -y install https://packages.endpoint.com/rhel/7/os/x86_64/endpoint-repo-1.7-1.x86_64.rpm

sudo yum install git

sudo vi /etc/yum.repos.d/CentOS-Base.repo

Find the [base] and [updates] sections and insert the exclude=postgresql* line in both sections.

sudo yum install https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm

yum list postgresql*

sudo yum install postgresql96-server

sudo yum install postgresql96-contrib postgresql96-devel

sudo /usr/pgsql-9.6/bin/postgresql96-setup initdb

systemctl start postgresql-9.6.service
yum install -y gcc redis python-devel python-virtualenv libjpeg-turbo-devel libxslt-devel libxml2-devel libffi-devel pcre-devel libyaml-devel redhat-rpm-config libpq-devel

systemctl start redis.service

yum install httpd mod_ssl

useradd -rm -g apache -d /opt/indico -s /bin/bash indico

passwd indico

usermod -aG wheel indico

curl -sL https://rpm.nodesource.com/setup_10.x | sudo bash -

sudo yum install nodejs

yum install watchdog

yum install python-docutils

yum groupinstall “Development Tools”

yum install python-psycopg2

yum install libpq

yum install libpq5-devel

su - indico

mkdir -p ~/dev/indico/data

cd ~/dev/indico

virtualenv env -p /usr/bin/python2.7

git clone GitHub - indico/indico: Indico - A feature-rich event management system, made @ CERN, the place where the Web was born. src

mkdir plugins

git clone GitHub - indico/indico-plugins: Indico plugins developed by the Indico team plugins/base

git clone GitHub - indico/indico-user-docs: Indico Documentation user-docs

cd src

git checkout 2.3-maintenance

sudo -u postgres createuser $USER --createdb

sudo -u postgres createdb indico_template -O $USER

sudo -u postgres psql indico_template -c “CREATE EXTENSION unaccent; CREATE EXTENSION pg_trgm;”

createdb indico -T indico_template

source ./env/bin/activate

pip install -U pip setuptools

cd src
pip install -r requirements.dev.txt

pip install pyrsistent==0.16.1

pip install -e .

npm ci

indico setup wizard --dev

indico db prepare

indico i18n compile-catalog

indico i18n compile-catalog-react

sudo httpd start

sudo service firewalld stop

sudo vi /etc/selinux/config # disabled se linux

indico run -h 10.10.10.107 -q --enable-evalex