gtkmm30 fails to build under 10.3

[scratch65535 at att.net]

[Default] On Thu, 17 Aug 2017 10:45:58 +0200, Jan Beich
<jbeich at FreeBSD.org> wrote:

><scratch65535 at att.net> writes:
>
>> [Default] On Wed, 16 Aug 2017 22:46:44 +0200, Jan Beich
>> <jbeich at FreeBSD.org> wrote:
>>
>>><scratch65535 at att.net> writes:
>>>
>>>> Package dependency requirement 'giomm-2.4 >= 2.49.1' could not be
>>>> satisfied.
>
>$ pkg which -o /usr/local/libdata/pkgconfig/giomm-2.4.pc
>/usr/local/libdata/pkgconfig/giomm-2.4.pc was installed by package devel/glibmm

We might be talking at crossed purposes, here.  The makefile did
indeed install 2.4, but that's not 2.49.1 (note that it's "2.49"
not "2.4.9").  2.49 is not visible in my
freshly-updated-just-before-these-build-attempts ports tree. .

The version number seems goofed up.  Why would it ever imagine
that 2.4 is 2.49?   There doesn't seem to be a rule that version
numbers are truncated to 1 digit after the decimal point. 

>
>>>> Package dependency requirement 'gtk+-3.0 >= 3.22.0' could not be
>>>> satisfied.
>
>$ pkg which -o /usr/local/libdata/pkgconfig/gtk+-3.0.pc
>/usr/local/libdata/pkgconfig/gtk+-3.0.pc was installed by package x11-toolkits/gtk30

Again, unless I'm misunderstanding something, 3.0 is not 3.22,
and that discrepancy is what it's complaining about.  

>
>Repeat for every such error then reinstall the affected ports.