CFD Online Discussion Forums - [OpenFOAM.com] Problem installing Openfoam from source. Allwmake doesn't work

I have Ubuntu and I installed OpenFOAM from source. It is installed in /home/<user>/OpenFOAM/OpenFOAM-v1806

When I run "icoFoam -help" in Terminal, I get this:

Code:

Command 'icoFoam' not found, but can be installed with:



sudo apt install openfoam

I manually edited file /home/<user>/.bashrc and added this at the end:
source ~/OpenFOAM/OpenFOAM-v1806/etc/bashrc

After some reading I found out I might need to compile Openfoam first. So I ran ./Allwmake and got this error. What am I doing wrong?

Code:

$ ./Allwmake 

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

2018-11-23 15:43:15 +0100

Starting OpenFOAM-v1806 

  Gcc system compiler

  linux64GccDPInt32Opt, with SYSTEMOPENMPI openmpi-system



flex -o /home/ubuntwo/OpenFOAM/OpenFOAM-v1806/wmake/platforms/linux64Gcc/wmkdep.c wmkdep.l && gcc -m64 -DOPENFOAM=1806 -Dlinux64 -DWM_ARCH_OPTION=64 -DWM_DP -DWM_LABEL_SIZE=32 -Wall -O3   -fPIC /home/ubuntwo/OpenFOAM/OpenFOAM-v1806/wmake/platforms/linux64Gcc/wmkdep.c -o /home/ubuntwo/OpenFOAM/OpenFOAM-v1806/wmake/platforms/linux64Gcc/wmkdep

/bin/sh: 1: flex: not found

Makefile:76: recipe for target '/home/ubuntwo/OpenFOAM/OpenFOAM-v1806/wmake/platforms/linux64Gcc/wmkdep' failed

make: *** [/home/ubuntwo/OpenFOAM/OpenFOAM-v1806/wmake/platforms/linux64Gcc/wmkdep] Error 127