Installing UQTkV3.0 on MAC OS x 10

Version 3 of UQ Toolkit is out.

The UQ Toolkit (UQTk) is a collection of libraries and tools for the quantification of uncertainty in numerical model predictions. Just like version 2, version 3.0 offers intrusive and non-intrusive methods for propagating input uncertainties through computational models, tools for sensitivity analysis, methods for sparse surrogate construction, and Bayesian inference tools for inferring parameters from experimental data.

Installing UQTk version 2 on a Mac was easy. Use gcc or clang and fire up the make file, but for version 3, the team has now shifted to cmake and if you want python interface you also need SWIG.

Just like in life, additional dependencies bring additional complexity and chances of things going wrong. Well this was my experience while installing UQtk version 3 on my mac.

Here are my running notes while installing the library on OS X 10.

Cmake doesn’t come preinstalled on a Mac. So get it from here. Installation is easy.

I didn’t have swig so had to download swig from here

Installing is 4 steps

  • Go to the untarred directory,
  • ./configure
  • make
  • sudo make install

I forgot the 4th step and got the following error while installing uqtk

CMake Error at /Applications/


Call Stack (most recent call first): /Applications/

— Configuring incomplete, errors occurred!

See also “/Users/sukhbindersingh/PROJECTS/UQTk_v3.0/builddir/CMakeFiles/CMakeOutput.log”.


So make sure, you do all the four steps…


SWIG needs PCRE-Perl compatible Regular expression library, which was not available on my mac, so download that too from here

Download PCRE not PCRE2. I wasted time installing PCRE2 to find that swig doesn’t recognise it.


Make CMAKE work in command line


Now cmake opens up as GUI in Mac OS by defauly, but we need command line version, so we have following 3 options

One may add CMake to the PATH:


Or, to install symlinks to ‘/usr/local/bin’, run:

sudo “/Applications/” –install

Or, to install symlinks to another directory, run:

sudo “/Applications/” –install=/path/to/bin


I opted for the second option, mostly because it was simplest and I want cmake to available everywhere and every time I need it

sudo “/Applications/” –install


Where are your gcc, gfortran, and clang?


Once we have all these and before you start, we have to check few things. In this installation, I wanted to use gcc, gfortran, and clang for my setup, so get to know where they are located in your system by using the ‘which’ command

The Installations


In the terminal, go to the UQTk_v3.0 directory

  • mkdir builddir
  • cd builddir/
  • cmake -DCMAKE_Fortran_COMPILER=/usr/local/bin/gfortran -DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_COMPILER=/usr/bin/clang ../../UQTk_v3.0


Replace green text with your own path.

Once the cmake configuration is complete successfully, type make

All will go ok, until you hit this error.

In file included from /Applications/


MacOSX10.11.sdk/usr/include/unistd.h:510:14:error:declaration of ‘optarg’ has a different language linkage

extern char *optarg; /*

getopt(3) external variables */


/Users/sukhbindersingh/PROJECTS/UQTk_v3.0/cpp/lib/include/gen_defs.h:49:14: note:

previous declaration is here

extern char *optarg;


1 error generated.

make[2]: *** [cpp/lib/CMakeFiles/uqtk.dir/tools/multiindex.cpp.o] Error 1


Well this is easy to solve and I think it’s an error in the file. Open gen_defs.h file from cpp/lib/include and comment the following line as shown.

extern char *optarg



Another error that I faced was the missing gfortran library because of no LIBRARY_PATH.

ld: library not found for -lgfortran

clang: error: linker command failed with exit code 1 (use -v to see invocation)

make[2]: *** [cpp/app/gen_mi/gen_mi] Error 1

make[1]: *** [cpp/app/gen_mi/CMakeFiles/

gen_mi.dir/all] Error 2

make: *** [all] Error 2


This meant my libgfortran.a was not in the LIBRARY_PATH, so let’s find where the library is and then set the LIBRARY_PATH environment variable pointing it to that folder.

Locate libgfortran*.a

sudo find /usr -iname ‘libgfortran*.a’


Found them here.



Set the environment variable to that folder.

export LIBRARY_PATH=/usr/local/gfortran/lib/


Compilation should continue smoothly and at last type make install and you should have everything installed.

Type ctest to check your installation



So here’s recap of the steps.

  1. mkdir builddir
  2. cd builddir
  3. cmake -DCMAKE_Fortran_COMPILER=/usr/local/bin/gfortran -DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_COMPILER=/usr/bin/clang ../../UQTk_v3.0 [Without python]

    or cmake -DPyUQTk=ON -P-DCMAKE_Fortran_COMPILER=/usr/local/bin/gfortran -DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_COMPILER=/usr/bin/clang ../../UQTk_v3.0 [With python]

  4. make
  5. make install

I faced two problems,

  1. error:declaration of ‘optarg’ has a different language linkage Solution: comment the offending line.
  2. ld: library not found for –lgfortran clang: error: linker command failed with exit code 1 Solution: export LIBRARY_PATH=/usr/local/gfortran/lib/

Using PyUQTk option gave me lot of problem, have delayed installing python binding for now due to lack of time.

Well now this is done, will spend couple of weekends looking at the library, you can fork the entire library from my github page. It has all the libs, so if the compliers are similar, they can be used as is without going through all this steps.


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