openssl issue

[The Doctor]

Package openssl was not found in the pkg-config search path.
Perhaps you should add the directory containing `openssl.pc'
to the PKG_CONFIG_PATH environment variable
Package 'openssl', required by 'virtual:world', not found
*** Missing pkg-config for package openssl (for Exim USE_OPENSSL_PC build option)
*** Error code 1

Stop.

Getting the above message when trying to implement an
Openssl app.  How do I fix this?

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