/usr/include/ASL/num/ is in libasl-dev 0.1.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ASL/num/aslBCond.h
/usr/include/ASL/num/aslBasicBC.h
/usr/include/ASL/num/aslBasicBC2.h
/usr/include/ASL/num/aslCrystalGrowthBC.h
/usr/include/ASL/num/aslDFOptimizer.h
/usr/include/ASL/num/aslDataResampling.h
/usr/include/ASL/num/aslFDAdvectionDiffusion.h
/usr/include/ASL/num/aslFDAdvectionDiffusion2.h
/usr/include/ASL/num/aslFDAdvectionDiffusionBC.h
/usr/include/ASL/num/aslFDAdvectionDiffusionInhomogeneous.h
/usr/include/ASL/num/aslFDElChemKinetics.h
/usr/include/ASL/num/aslFDElasticity.h
/usr/include/ASL/num/aslFDElasticityBC.h
/usr/include/ASL/num/aslFDMultiPhase.h
/usr/include/ASL/num/aslFDPoroElasticity.h
/usr/include/ASL/num/aslFDPoroElasticityBC.h
/usr/include/ASL/num/aslFDStefanMaxwell.h
/usr/include/ASL/num/aslInterfaceTrackingAlg1.h
/usr/include/ASL/num/aslLBGK.h
/usr/include/ASL/num/aslLBGKBC.h
/usr/include/ASL/num/aslLSFacetedGrowth.h
/usr/include/ASL/num/aslLSNormalGrowth.h
/usr/include/ASL/num/aslLevelSet.h
/usr/include/ASL/num/aslLevelSetLinear.h
/usr/include/ASL/num/aslNumMethod.h
/usr/include/ASL/num/aslNumMethodsMerger.h
/usr/include/ASL/num/aslSingleKernelNM.h
/usr/include/ASL/num/aslTimeContinuations.h
/usr/include/ASL/numExtend/aslFDAdvectionDiffusionExtended.h