[MacPorts] #56837: textmate2: parsing Portfile fails on on OS 10.10

[MacPorts]

#56837: textmate2: parsing Portfile fails on on OS 10.10
--------------------+------------------------
 Reporter:  petrrr  |      Owner:  neverpanic
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.5.3
 Keywords:          |       Port:  textmate2
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 Recently, the port is not correctly parsed and index during `sync` or
 `selfupdate` on my OS X 10.10.5 machine.

 It seems to be the only port affected so I am compiling this against the
 port itself, though I could imagine this might be attributable to some
 changes in base as well.


 {{{
 petr% sudo port -v sync
 --->  Updating the ports tree
 Synchronizing local ports tree from
 file:///opt/local/var/macports/sources/github.com/macports/macports-ports/
 Current branch master is up to date.
 Creating port index in /opt/local/var/macports/sources/github.com/macports
 /macports-ports
 Error: Unable to determine location of a macOS SDK.
 Failed to parse file editors/textmate2/Portfile: can't read
 "configure.sdkroot": Unable to determine location of a macOS SDK.

 Total number of ports parsed:   1
 Ports successfully parsed:      0
 Ports failed:                   1
 Up-to-date ports skipped:       20127

 }}}

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Ticket URL: <https://trac.macports.org/ticket/56837>
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