How to fix issue: During static contend deploy I get errors: Compilation from source: /vendor/magento/theme-frontend-blank/web/css/styles-l.less?

During static contend deploy I get errors:

Compilation from source: /srv/www/rmstaging/public_html/vendor/magento/theme-frontend-blank/web/css/styles-l.less

Compilation from source: frontend/Smartwave/porto_rtl/en_US/css/styles-l.less variable @modal-popup-breakpoint-screen__m is undefined in file /srv/www/rmstaging/public_html/var/view_preprocessed/css/frontend/Smartwave/porto_rtl/en_US/Magento_Checkout/css/source/module/checkout/_tooltip.less in _tooltip.less on line 11, column 41

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Replace the following piece of code, found on line 11:

@checkout-tooltip-breakpoint__screen-m: @modal-popup-breakpoint-screen__m;

with the following code:

@checkout-tooltip-breakpoint__screen-m: @screen__m;