[ncl-install] A problem about NCL installation on Mac system

[Kevin Hallock]

Hi Yunpeng,

I think that the $NCARG_LIB and $NCARG_INC environment variables are unnecessary in your situation; just setting $NCARG_ROOT should be enough.

NCL makes certain assumptions about the directory structure under $NCARG_ROOT, but $NCARG_LIB and $NCARG_INC (as well as several other variables <https://www.ncl.ucar.edu/Document/Language/env.shtml>) can be used to override these assumptions. Normally, when NCL tries to load the sysresfile or access color maps, it assumes that the relevant files are located in $NCARG_ROOT/lib/ncarg.

However, when $NCARG_LIB is set, any file that is usually found under $NCARG_ROOT/lib is instead assumed to be located in the same relative path under $NCARG_LIB. For example, instead of finding the sysresfile at $NCARG_ROOT/lib/ncarg/sysresfile (/Users/yunpengshan/equipment/researchtools/NCL640/lib/ncarg/sysresfile), NCL assumes it should look for $NCARG_LIB/ncarg/sysresfile (/Users/yunpengshan/equipment/researchtools/NCL640/bin/ncarg/sysresfile), and I believe this may be causing the warnings you observed.

I hope this helps,
Kevin

> On Oct 19, 2017, at 11:21 AM, Yunpeng Shan <yunpengshan2014 at gmail.com> wrote:
> 
> Hello Kevin,
> 
> This is the output of your command:
> NCARG_ROOT=/Users/yunpengshan/equipment/researchtools/NCL640/
> NCARG_LIB=/Users/yunpengshan/equipment/researchtools/NCL640//bin
> NCARG_INC=/Users/yunpengshan/equipment/researchtools/NCL640//include
> 
> 
> I set up the environment like I did for the Linux system. But it does not work well in Mac
> 
> Thank you very much for your help
> 
> With best wishes
> 
> Yunpeng Shan
> 
> On Thu, Oct 19, 2017 at 9:38 AM, Kevin Hallock <hallock at ucar.edu <mailto:hallock at ucar.edu>> wrote:
> Hi Yunpeng,
> 
> Could you please run the command “env | grep NCARG” and reply with the output?
> 
> Based on the path of your NCL640 directory, the sysresfile file and colormaps directory should exist in the /Users/yunpengshan/equipment/researchtools/NCL640/lib/ncarg directory. I wonder if one of the $NCARG_* environment variables could be causing this.
> 
> Thanks,
> Kevin 
> 
>> On Oct 19, 2017, at 9:45 AM, Yunpeng Shan <yunpengshan2014 at gmail.com <mailto:yunpengshan2014 at gmail.com>> wrote:
>> 
>> Hello, 
>> 
>> I attempted to install a NCL 6.4.0 on my MacBook Pro. All of the installation processes were successful. But when I run the ncl command, I was informed by some warnings:
>> 
>> warning:Unable to load System Resource File /Users/yunpengshan/equipment/researchtools/NCL640/bin/ncarg/sysresfile
>> warning:WorkstationClassInitialize:Unable to access rgb color database - named colors unsupported:[errno=2]
>> warning:["Palette.c":1850]:NhlLoadColormapFiles: Invalid colormap directory: /Users/yunpengshan/equipment/researchtools/NCL640/bin/ncarg/colormaps
>> 
>> I checked the path in bin/ there is no a folder named ncarg or colormaps. 
>> 
>> Please help me to solve such a problem.
>> 
>> Thank you very much for your help.
>> 
>> With best wishes
>> 
>> Yunpeng Shan
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