OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › GSL – GNU Scientific Library › Reply To: GSL – GNU Scientific Library October 23, 2020 at 11:21 am #5247 stephanModerator PPS: GSL typically requires an additional algebra subroutine library. Hence the final compiler command (if the library is linked to the default path) in your Makefile should end with ... -lgsl - lgslcblas -lm -lz -o $@.