Installing Cplex in Linux Ubuntu

I’ve been trying to install ILOG’s Cplex product on a 64 bit Ubuntu machine. There are a few small hiccups I encountered.

First, try to install as root with


On my machine I’m installing to /opt/ILOG/CPLEX_Studio122. If you get an error like “jre/bin/java: not found” then you need the “32 bit libs” package:

apt-get install ia32-libs

(You may also need to set the path with LD_LIBRARY_PATH=/usr/lib32). The 32 bit libraries seem to be required only for the installer (at least, they are not needed for programs that just link with the static Cplex libs).

After installing, you may get a build error (running as a non-root user) that it can’t find the cplex header files. Try ls /opt/ILOG/CPLEX_Studio122 and see if there are permission denied messages – the installation seems to screw up some permissions on this folder, however this is easily fixed with chmod +r /opt/ILOG/CPLEX_Studio122.

If you are using COIN-OR‘s Osi class OsiCpxSolverInterface you will also need the following at the top of your OsiCpxSolverInterface.cpp file:

#include “/opt/ILOG/CPLEX_Studio122/cplex/include/ilcplex/cplex.h”

A typical Makefile snippet which includes Cplex and COIN/Osi might then look like:

my_objects = YourFile.o OsiCbcSolverInterface.o OsiCpxSolverInterface.o

CPPFLAGS = -fPIC -I/usr/include -I/usr/include/coin -DNDEBUG -I/opt/ILOG/CPLEX_Studio122/cplex/include/ilcplex

LIBFLAGS = -l:/opt/ILOG/CPLEX_Studio122/cplex/lib/x86-64_sles10_4.1/static_pic/libcplex.a -l:/opt/ILOG/CPLEX_Studio122/cplex/lib/x86-64_sles10_4.1/static_pic/libilocplex.a

my_program : $(my_objects)
g++ -Wall -fPIC -shared -o my_program $(my_objects)

.PHONY : clean

clean :
rm *.o my_program

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