On Thu, 7 Jun 2018, Ryan Schmidt wrote:

Speaking of Xcode, I keep being offered to upgrade it, but it will only run on High Sierra.

I assume this upgrade offer is coming from the Mac App Store. I'm not sure why it would offer you a version of Xcode that's not compatible with your OS. It's supposed to know when something requires a newer OS, and only display it as an "incompatible update" which cannot be installed. That's what happens for me on Sierra.

Yep, the App Store, and no, I don't why either, but it does say "incompatible update" now (it didn't used to).

The first time I tried that, I got a message about something being incompatible with this box which I couldn't write down fast enough before it reverted to Sierra. The next time I tried (paying more attention this time), it bombed out because a critical file was missing...

I can't really diagnose the problem based on that description. Upgrading to High Sierra will not fix the gcc49 build failure, but if you'd like to upgrade to High Sierra anyway and are having trouble, please let us know your exact computer model, and the specific error messages you're encountering.

Sanitised version attached; it's a bit out of date, but the hardware has not changed.

I'll attempt another High Sierra upgrade later, when I have a few hours to spare, and report back.

-- Dave
{\rtf1\ansi\ansicpg1252\cocoartf1504\cocoasubrtf830
{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
{\colortbl;\red255\green255\blue255;}
{\*\expandedcolortbl;;}
{\*\listtable{\list\listtemplateid1\listhybrid{\listlevel\levelnfc23\levelnfcn23\leveljc0\leveljcn0\levelfollow0\levelstartat1\levelspace360\levelindent0{\*\levelmarker
 \{disc\}}{\leveltext\leveltemplateid1\'01\uc0\u8226 
;}{\levelnumbers;}\fi-360\li720\lin720 }{\listname ;}\listid1}}
{\*\listoverridetable{\listoverride\listid1\listoverridecount0\ls1}}
{\info
{\author Dave 
Horsfall}}\paperw11900\paperh16840\margl1440\margr1440\vieww12800\viewh13400\viewkind1
\pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\pardirnatural\qc\partightenfactor0

\f0\fs24 \cf0 \ul \ulc0 Dave Horsfall\'92s MacBook\
\pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\pardirnatural\partightenfactor0
\cf0 \ulnone \
Purchased around 13th March 2010.\
\
Model MC207xx/A, 13\'94 screen, serial number 45008Q7xxxx, late 2009.  The 
firmware calls itself a MacBook 6,1 (note the ",").\
\
4GB PC3-8500 1067MHz SO-DIMM DDR3 memory (dealer installed).\
\
2.26GHz dual-core 64-bit CPU.\
\
Nvidia GeForce 9400M 256MB.\
\
250GB SATA disk, now external USB due to damaged m/board connector.  Hitachi 
5K500 B-250 2.5\'94 (9.5mm).\
\
DVD burner HL-DT-DVDRW GS23N.\
\
Battery 661-5391 (replaced).\
\
Was 10.6.8 Snow Leopard, various upgrades through Mavericks and Yosemite, now 
on Sierra 10.12.4 11/4/17 through to Sierra 10.12.6 plus sec. fixes (doesn't 
seem to like High Sierra).\
\
Was Xcode 5.1.1 plus command line tools, upgraded through to 8.3.1 12/4/17, now 
on 8.3.2 26/4/17; now somewhere around 9.2 14/12/17.\
\
Safari and Chrome not used; started with Firefox 33.0 instead, always upgraded 
through to 52.0.2 ??/4/17, 52.0.2ESR on 28/4/17, 53.0.3 24/5/17; zillions since 
since then, and now latest Quantum 59.0.2 28/3/18.\
\
MacPorts 2.3.2, now 2.4.1 ??/4/17; 2.4.2 on 9/10/17.\
\
Time Capsule 7.6.4, wireless on for testing remote access, Ethernet on.  
Purchased 16th March 2010.\
\
Known current faults:\
\pard\tx220\tx720\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\li720\fi-720\pardirnatural\partightenfactor0
\ls1\ilvl0\cf0 {\listtext       \'95    }No audio device found.\
{\listtext      \'95    }DVD won\'92t eject disk, and won\'92t read what\'92s 
in there.  Since removed, and found to be jammed and damaged.\
}

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