[MacPorts] #30640: Libcaca build error

[MacPorts]

#30640: Libcaca build error
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 Reporter:  giby_the_kid@…         |       Owner:  phw@…           
     Type:  defect                 |      Status:  new             
 Priority:  Normal                 |   Milestone:                  
Component:  ports                  |     Version:  2.0.1           
 Keywords:                         |        Port:  libcaca         
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Comment(by ryandesign@…):

 So both here and in #30641 the complaint is:
 {{{
 :info:build ** (/opt/local/lib/mono/1.0/mcs.exe:13569): CRITICAL **:
 _wapi_shm_file_open: shared file [/var/empty/.wapi/shared_data-sth-
 dw399.rhi.hi.is-Darwin-i386-312-12-0] open error: No such file or
 directory
 }}}
 I'll bet this relates to MacPorts 2.0's new macports user concept:
 /var/empty is that user's home directory, so this "mcs.exe" is apparently
 trying to write to the home directory, failing to do so because it does
 not have permission to write to /var/empty, then experiencing this
 critical error when unable to read the file it previously failed to write.
 Perhaps modifying the port to set $HOME to something inside ${workpath}
 would be a workaround.

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Ticket URL: <https://trac.macports.org/ticket/30640#comment:3>
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