define => "ENABLE_CSS_TRANSFORMS_ANIMATIONS_UNPREFIXED", default => 1, value => \$cssAnimationsTransformsUnprefixedSupport },
{ option => "css-variables", desc => "Toggle CSS Variable support",
- define => "ENABLE_CSS_VARIABLES", default => (isBlackBerry() || isEfl()), value => \$cssVariablesSupport },
+ define => "ENABLE_CSS_VARIABLES", default => (isBlackBerry() || isEfl() || isGtk()), value => \$cssVariablesSupport },
{ option => "custom-scheme-handler", desc => "Toggle Custom Scheme Handler support",
define => "ENABLE_CUSTOM_SCHEME_HANDLER", default => (isBlackBerry() || isEfl()), value => \$customSchemeHandlerSupport },