Unhelpful install instructions

[KingSupernova31]

The README says to run cmake .. -DCMAKE_INSTALL_PREFIX=install -DCMAKE_PREFIX_PATH=path/to/dependencies, but does not specify what dependencies are needed.

[webisu]

Unfortunately installing the various libraries that wgrib2 needs is very system dependent.
I have only built wgrib2 on my Ubuntu system. I had to install software using github,
apt-get and synaptic. The following is from my notes.

--------------- to install iplib -------------------
Install openblas (ubuntu)
$ sudo apt-get install libopenblas-dev

rm -rf $HOME/ip
mkdir $HOME/ip
cd $HOME/ip
----download NCEPLIBS-ip from github (develop branch)
git clone "https://github.com/NOAA-EMC/NCEPLIBS-ip"
cd NCEPLIB-ip
edit CMakeLists.txt
change option(OPENMP "Use OpenMP threading" OFF)
to option(OPENMP "Use OpenMP threading" ON)
mkdir build
cd build
-----------install libaec --------------------
ubuntu: sudo apt install libaec-dev
edit CMakeLists.txt option(USE_AEC "Use AEC?" on)

-----------install openjpeg --------------------
sudo apt install libopenjp2-7-dev

----------install netcdf and hdf4-----
synaptic install libnetcdf-dev .. installs many packages
sudo apt install netcdf-bin * need ncdump to pass wgrib2 tests *

---

png
install libpng by
synaptic libpng-dev png v 1.6

--------- install g2c --------------
export g2c_DIR=/usr/local/NCEPLIBS-g2c/lib/cmake/g2c

cmake -DCMAKE_INSTALL_PREFIX=$HOME/ip ..
make

do not do "make -j(some integer)"

make test
(sudo) make install

----- Caution -----------------
If someone did a "root build", the ip build will be in /usr/local
This will over ride the "user build"!
So a user cannot install a newer version of ip!

After you have installed the library, Now to build wgrib2
need to get wgrib2

git clone [email protected]:NOAA-EMC/wgrib2.git
cd wgrib2
ex enable netcdf
edit CMakeLists.txt option(USE_NETCDF "Use NetCDF?" on)
enable AEC
edit CMakeLists.txt option(USE_AEC "Use AEC?" off)
enable openjpeg
edit CMakeLists.txt option(USE_OPENJPEG "Use NetCDF?" on)
enable ipolates
edit CMakeLists.txt option(USE_IPOLATES "Use Ipolates" on)
(comments may have changed)

mkdir build
cd build
export g2c_DIR=/usr/local/NCEPLIBS-g2c/lib/cmake/g2c
cmake ..
cmake .. -DCMAKE_BUILD_TYPE=Release
make
make test

parallel build
make -jN
make -jN test
(sudo) make install