fix build with CondaEnv #969

Job	Run time
list-examples	7s
examples/machine-learning/example_born_fully_connected.jl	1m 26s
examples/machine-learning/example_extended_source.jl	1m 35s
examples/machine-learning/example_extended_source_cnn.jl	1m 48s
examples/scripts/extended_source_lsqr.jl	1m 41s
examples/scripts/fwi_example_2D.jl	50s
examples/scripts/fwi_example_ADloss.jl	1m 29s
examples/scripts/fwi_example_NLopt.jl	1m 32s
examples/scripts/fwi_example_constraints.jl	1m 32s
examples/scripts/fwi_example_minConf.jl	1m 30s
examples/scripts/fwi_example_studentst.jl	1m 31s
examples/scripts/fwi_gauss_newton.jl	58s
examples/scripts/illum.jl	48s
examples/scripts/imaging_conditions.jl	49s
examples/scripts/lsrtm_2D.jl	53s
examples/scripts/modeling_basic_2D.jl	18s
examples/scripts/modeling_basic_3D.jl	45s
examples/scripts/modeling_basic_elastic.jl	47s
examples/scripts/modeling_extended_source_2D.jl	40s
examples/scripts/modeling_extended_source_3D.jl	37s
examples/scripts/modeling_medical_2D.jl	36s
examples/scripts/modeling_wavefields_2D.jl	37s
examples/scripts/splsrtm_2D.jl	18s
	23m 7s

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