Libgl dlopen does not work in modules

General Usage
1

Hello, I am on julia 0.7 and I have the following problem.

This code runs without any problems:

using Libdl
dlopen(:libgslcblas, RTLD_GLOBAL)
sf_gamma_inc_Q(a, x) = ccall((:gsl_sf_gamma_inc_Q, :libgsl), Cdouble, (Cdouble, Cdouble), a, x)

sf_gamma_inc_Q(1.0, 2.0)

Now, when I put this into a Module and then try to use it, it does not work:

Gamma.jl:

module Gamma
using Libdl
dlopen(:libgslcblas, RTLD_GLOBAL)
sf_gamma_inc_Q(a, x) = ccall((:gsl_sf_gamma_inc_Q, :libgsl), Cdouble, (Cdouble, Cdouble), a, x)
end

somewhere else:

using Gamma
Gamma.sf_gamma_inc_Q(1.0, 2.0)

returns:

ERROR: LoadError: error compiling sf_gamma_inc_Q: could not load library "libgsl"
/usr/lib/libgsl.so: undefined symbol: cblas_ctrmv

When manually add using Libdl; dlopen(:libgslcblas, RTLD_GLOBAL) into this file everything works again.

But I want to work it without the need that Gamma.jl needs some additional libraries.

What is happening here and how can I fix it?

Thanks.