[MacPorts] #57475: ncarg @6.5.0_2: Install fails, wrong hdf5 variant

[MacPorts]

#57475: ncarg @6.5.0_2: Install fails, wrong hdf5 variant
--------------------------+----------------------
 Reporter:  Dave-Allured  |      Owner:  tenomoto
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.5.4
 Keywords:                |       Port:  ncarg
--------------------------+----------------------
 I am testing a full MacPorts install from source.  "Port -v install ncarg"
 installs 220 dependencies, then fails like this:

 {{{
 --->  Configuring ncarg
 Error: Install hdf5 +gcc8
 Error: Failed to configure ncarg: hdf5 +gcc8 not installed
 }}}

 Main.log shows that a variant of hdf5 was installed, but ncarg configure
 did not like it:

 {{{
 :debug:configure hdf5 is installed with the following variants: +cxx+hl
 :debug:configure   required: gcc8, forbidden:
 :debug:configure   rejected, because required variant gcc8 is missing
 }}}

 How can this be fixed to provide a simple clean install of ncarg?  I am
 not sure whether the problem resides in ncarg, hdf5, or somewhere else.
 Here is my configuration:

 {{{
 sw_vers:
 ProductName:    Mac OS X
 ProductVersion: 10.13.6
 BuildVersion:   17G65

 Xcode 10.0
 Build version 10A255
 }}}

 I am installing to a private user directory, not /opt/local.  Root
 privileges are disabled.  I pre-installed certain known fixes for two
 dependencies.  I ran port selfupdate in advance, of course.

-- 
Ticket URL: <https://trac.macports.org/ticket/57475>
MacPorts <https://www.macports.org/>
Ports system for macOS