[redbullah]

Hello everyone,
While installing OF2.4.0 on Ubuntu16.04, I get the following Third Party related cmake errors during Allwmake:

== Generating build files ==
Configuring libCGAL
-- Requested component: MPFR
-- Requested component: GMP
libCGAL is configured
-- Sources for CGAL component library 'CGAL_ImageIO/CMakeLists.txt' detected
CMake Error at src/CMakeLists.txt:81 (add_subdirectory):
  add_subdirectory given source
  "/opt/OpenFOAM/ThirdParty-2.4.0/CGAL-4.6/src/CGAL_ImageIO/CMakeLists.txt"
  which is not an existing directory.
Call Stack (most recent call first):
  src/CMakeLists.txt:140 (configure_component)


-- Sources for CGAL component library 'CGAL_Qt4/CMakeLists.txt' detected
CMake Error at src/CMakeLists.txt:81 (add_subdirectory):
  add_subdirectory given source
  "/opt/OpenFOAM/ThirdParty-2.4.0/CGAL-4.6/src/CGAL_Qt4/CMakeLists.txt" which
  is not an existing directory.
Call Stack (most recent call first):
  src/CMakeLists.txt:140 (configure_component)


-- Sources for CGAL component library 'CGAL_Core/CMakeLists.txt' detected
CMake Error at src/CMakeLists.txt:81 (add_subdirectory):
  add_subdirectory given source
  "/opt/OpenFOAM/ThirdParty-2.4.0/CGAL-4.6/src/CGAL_Core/CMakeLists.txt"
  which is not an existing directory.
Call Stack (most recent call first):
  src/CMakeLists.txt:140 (configure_component)


-- Sources for CGAL component library 'CGAL_Qt3/CMakeLists.txt' detected
CMake Error at src/CMakeLists.txt:81 (add_subdirectory):
  add_subdirectory given source
  "/opt/OpenFOAM/ThirdParty-2.4.0/CGAL-4.6/src/CGAL_Qt3/CMakeLists.txt" which
  is not an existing directory.
Call Stack (most recent call first):
  src/CMakeLists.txt:140 (configure_component)


-- Sources for CGAL component libraries 'CGAL_Core/CMakeLists.txt;CGAL_ImageIO/CMakeLists.txt;CGAL_Qt3/CMakeLists.txt;CGAL_Qt4/CMakeLists.txt' detected
== Generating build files (DONE) ==

-- Configuring incomplete, errors occurred!
See also "/opt/OpenFOAM/ThirdParty-2.4.0/build/linux64Gcc/CGAL-4.6/CMakeFiles/CMakeOutput.log".
See also "/opt/OpenFOAM/ThirdParty-2.4.0/build/linux64Gcc/CGAL-4.6/CMakeFiles/CMakeError.log".
+ exit 1

========================================
Done ThirdParty Allwmake
========================================

What might be causing the problem? Other than that, there seems no additional problems. I am installing in /opt/OpenFOAM directory as root by the way. Also I get a few warnings during compilation, are they important to take care of? Thanks in advance.

[wyldckat]

Quick answer: Step-by-step installation instructions for the versions you stated are given here: https://openfoamwiki.net/index.php/I...u#Ubuntu_16.04

Compiling OpenFOAM as root is a bit of a risk, because if you mistype a command, you risk damaging your complete Ubuntu installation, so be veeeery careful!