python - Does .ebextensions or requirements.txt run first in Elastic Beanstalk -

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the .config file in .ebextensions or requirements.txt runs first?

i want install psycopg2 present in requirements.txt that, need install postgresql-devel, python-devel packages installed first.

when create config settings like

requirements.txt 

psycopg2

.ebextensions/mysite.config

packages:   yum:     gcc: []     python-devel: []     postgresql-devel: []

  1. from logs, observed that, requirements.txt executed first, raising errors prerequisites not installed.

  2. yum raising postgresql-devel not found in packages.

how fix these? going wrong?

i having same error , got work specifying version

packages:   yum:     libxslt-devel: ''     postgresql93-devel: []

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