add instructions in readme that you may have to install gsl libraries if building locally

[sbillinge]

...and give commands for macos and ubuntu. See Slack for info.

[bobleesj]

On MacOS (Worked for @bobleesj M1)

brew install gsl

On ubuntu (worked for @sbillinge )

sudo apt-get update
sudo apt-get install libgsl-dev

The error message before was:

clang++ -DNDEBUG -fwrapv -O2 -Wall -fPIC -O2 -isystem /Users/imac/miniconda3/envs/pdffit2_test/include -arch arm64 -fPIC -O2 -isystem /Users/imac/miniconda3/envs/pdffit2_test/include -arch arm64 -I/private/var/folders/yd/2758vf317zggm0n0mfmk0tpw0000gn/T/pip-install-dr9tinaa/diffpy-pdffit2_9a1c50a0b0e64854a8cff6bf93d0732f -I/Users/imac/miniconda3/envs/pdffit2_test/include/python3.11 -c src/extensions/libpdffit2/pdf.cc -o build/temp.macosx-11.0-arm64-cpython-311/src/extensions/libpdffit2/pdf.o -std=c++11 -Wall -Wno-write-strings -O3 -funroll-loops -ffast-math
      src/extensions/libpdffit2/pdf.cc:29:10: fatal error: 'gsl/gsl_errno.h' file not found
      #include <gsl/gsl_errno.h>
               ^~~~~~~~~~~~~~~~~
      1 error generated.
      error: command '/usr/bin/clang++' failed with exit code 1

[Tieqiong]

@sbillinge I'm not entirely sure but isn't gsl and g++ only required if we pip install? If people install from Conda (which we want them to do) then this doesn't seem necessary.

[sbillinge]

yes, that's right. It is maybe good enough to leave it here in the issues and then repost to diffpy-users if anyone asks about it?

[Tieqiong]

Just for reference, an easier way might be instead of installing gsl globally we can install it inside of the Conda environment by running conda install gsl. gsl is also one of the requirement for building for diffpy.pdffit2.

[sbillinge]

Just for reference, an easier way might be instead of installing gsl globally we can install it inside of the Conda environment by running conda install gsl. gsl is also one of the requirement for building for diffpy.pdffit2.

yes, even better if it works.

[bobleesj]

doesn't seem to be relevant for diffpy.pdfgui since diffpy.pdffit2 will be installed via conda-forge in the conda environment using conda install --file requirements/run.txt

[sbillinge]

we may want to just summarize the thread and dump it onto diffpy-users for safe keeping. I htink that is a better place for it as it will affect only a small number of people.

[sbillinge]

closed by #211