tumashu <tumashu@163.com> writes:

> How to install flashplayer or gnash on guixsd?

It looks like GNU Gnash is not available yet.  It's waiting for you to
package it!  :-)

https://www.gnu.org/software/guix/manual/html_node/Defining-Packages.html#Defining-Packages

When you say "flashplayer", are you referring to Adobe Flash Player [1]?
If so, it will probably not be packaged in Guix, since the license under
which it is distributed appears to be a non-free license [2].  (For
example, that license says things like "You may install and Use one copy
of the Software on your Compatible Computer," and "This license does not
grant you the right to sublicense or distribute the Software".)

[1] https://get.adobe.com/flashplayer/

[2]
https://wwwimages2.adobe.com/www.adobe.com/content/dam/Adobe/en/legal/licenses-terms/pdf/PlatformClients_PC_WWEULA-en_US-20150407_1357.pdf

-- 
Chris