running_eigen_tests.txt

mkdir build
cd build
#http://eigen.tuxfamily.org/bz/show_bug.cgi?id=967
cmake ../ -G 'Unix Makefiles' -DEIGEN_BUILD_STRING_SUFFIX=cxx11 -DEIGEN_TEST_CUSTOM_CXX_FLAGS=-std=c++11
#make check -j 18 #This compiles all tests (takes a very long time)

make check TEST='bicgstab'
In test directory:
CMakeLists.txt
ei_add_test(bicgstabell)

Added file bicgstabell.cpp, modified that it can do the bicgstab tests for bicgstabell
added bigstabell.h into Eigen/IterativeLinearSolvers by adding
#include "src/IterativeLinearSolvers/bicgstabell.h"
added bicgstabell.h in directory src/IterativeLinearSolvers/

make check TEST='bicgstabell'

https://eigen.tuxfamily.org/index.php?title=Tests#Working_on_one_specific_test

make bicgstab -j
test/bicgstab_1
test/bicgstab_2
test/bicgstab_3

make bicgstabell -j
test/bicgstabell_1
test/bicgstabell_2
test/bicgstabell_3

make idrstab -j
test/idrstab_1
test/idrstab_2
test/idrstab_3