* gnu/packages/vnc.scm (%tigervnc-client-source): New variable.
(tigervnc-server): Move input fields after arguments.
[native-inputs]: Use new style and 'modify-inputs'. Do not add
tigervnc-client regular inputs.
[configure-flags]: Use gexps, cons* instead of append.
[phases]: Use gexps.
{check}: Replace smiley with an explanatory comment.
{copy-tvnc-xserver}: Adjust default Makefile variables, which simplifies
needed bindings in other phases.
{build-tigervnc, build, install-tigervnc-aux, install}: Remove let*-bound
variables.
{build-tigervnc, build}: Honor PARALLEL-BUILD?.
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