[MacPorts] #57767: py36-graph-tool uses incorrect python version 2.7

[MacPorts]

#57767: py36-graph-tool uses incorrect python version 2.7
---------------------+-----------------------------
 Reporter:  ssllmit  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.5.4
 Keywords:           |       Port:  py36-graph-tool
---------------------+-----------------------------
 {{{py36-graph-tool}}} uses the incorrect python version, default to v. 2.7
 in its port file, which results in incorrect dependencies during the
 build.

 First, clean everything and set {{{python}}} to use v. 3.6:

 {{{
 sudo port clean --all py36-graph-tool,
 sudo port select --set python python36
 hash -r
 }}}

 Confirm:

 {{{
 $ python --version
 Python 3.6.7
 }}}

 An install of {{{py36-graph-tool}}} gets the wrong python version (default
 v. 2.7):

 {{{
 sudo port -pN install py36-graph-tool
 --->  Computing dependencies for py36-graph-tool
 --->  Dependencies to be installed: boost cgal
 --->  Fetching archive for boost
 --->  Attempting to fetch
 boost-1.66.0_3+no_single+no_static+python27.darwin_17.x86_64.tbz2 from
 https://packages.macports.org/boost
 }}}

 This issue appears to go beyond {{{py36-graph-tool}}} because {{{boost}}}
 also shows the same dependency issue:

 {{{
 port list depof:boost
 bzip2                          @1.0.6          archivers/bzip2
 expat                          @2.2.6          textproc/expat
 icu                            @58.2           devel/icu
 libiconv                       @1.15           textproc/libiconv
 python27                       @2.7.15         lang/python27
 zlib                           @1.2.11         archivers/zlib
 }}}

 I confirm this issue on a separate system with a newly installed Macports,
 and do not believe this is a local configuration issue.

 FWIW, I'm trying to track down a segmentation fault with
 {{{gt.graph_draw}}} that I hope is related to this build problem…

 {{{
 gt.graph_draw(g)
 Segmentation fault: 11
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/57767>
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