Installation Path about scip.jl

[rschwarz]

You can choose any directory, but you should specify it already when building SCIPOptSuite (in the cmake call), so that the headers and libraries are installed to that location.

In your case, since you seem to be using Ubuntu, you don't actually need to build SCIPOptSuite from source. Instead, you could try downloading the .deb package from the SCIP homepage and simply install it. In that case, do not specify SCIPOPTDIR, or set it to /usr, since SCIP will then be installed system-wide.

[vtjeng]

Specifically, when I'm running Pkg.build("SCIP"), I get the error

make[1]: Entering directory '/home/ubuntu/.julia/v0.6/SCIP/deps/src/CSIP-0.5.2'
Creating symbolic links to headers and library within SCIPOPTDIR (/home/ubuntu/Downloads/scipoptsuite-6.0.0/scip/src/scip).
ERROR: no SCIP headers found in SCIPOPTDIR!
Makefile:68: recipe for target 'links' failed
make[1]: *** [links] Error 1
make[1]: Leaving directory '/home/ubuntu/.julia/v0.6/SCIP/deps/src/CSIP-0.5.2'
Makefile:95: recipe for target '/home/ubuntu/.julia/v0.6/SCIP/deps/src/CSIP-0.5.2/lib' failed
make: *** [/home/ubuntu/.julia/v0.6/SCIP/deps/src/CSIP-0.5.2/lib] Error 2
===============================================================================[ ERROR: SCIP ]===============================================================================


LoadError: failed process: Process(`make`, ProcessExited(2)) [2]
while loading /home/ubuntu/.julia/v0.6/SCIP/deps/build.jl, in expression starting on line 52

(make test passes, but the build fails for a variety of SCIPOPTDIRs I've tried).

[rschwarz]

Maybe try to specify a SCIPOPTDIR which is outside the directory where you extracted the tar.gz, just to make sure nothing is overwritten or otherwise confused. If you then (after building SCIPOptSuite) look into that directory, you should see files and dirs like bin/scip, include/, lib/.

[vtjeng]

When installing the .deb package and not specifying a SCIPOPTDIR:

julia> Pkg.add("SCIP")
INFO: Cloning cache of SCIP from https://github.com/SCIP-Interfaces/SCIP.jl.git
INFO: Installing SCIP v0.5.2
INFO: Building SCIP
===============================================================================[ ERROR: SCIP ]===============================================================================


LoadError: AssertionError: Environment variable `SCIPOPTDIR` not set!
while loading /home/ubuntu/.julia/v0.6/SCIP/deps/build.jl, in expression starting on line 11

=============================================================================================================================================================================


==============================================================================[ BUILD ERRORS ]===============================================================================


WARNING: SCIP had build errors.

 - packages with build errors remain installed in /home/ubuntu/.julia/v0.6
 - build the package(s) and all dependencies with `Pkg.build("SCIP")`
 - build a single package by running its `deps/build.jl` script

[vtjeng]

Setting the SCIPOPTDIR to /usr when installing using the .deb as you suggested worked.

[vtjeng]

I haven't yet had a chance to try your suggestion when compiling from sources, but as you point out, on Linux installing from .deb and setting SCIPOPTDIR to /usr allows Pkg.build to complete successfully.

[rschwarz]

That's good, I will close then.

I was under the impression that we have some code (in CSIP's Makefile?) that looks in /usr automatically when SCIPOPTDIR is not set, but maybe I'm mistaken.