# Undefined symbol

**URL:** <https://discourse.julialang.org/t/undefined-symbol/41165>\
**Category:** General Usage\
**Created:** [June 10, 2020, 10:17pm UTC](https://discourse.julialang.org/t/undefined-symbol/41165 "2020-06-10T22:17:52Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![jlapeyre](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jlapeyre/32/4514_2.png) [@jlapeyre](https://discourse.julialang.org/u/jlapeyre)\
**Post date:** [June 11, 2020, 11:44am UTC](https://discourse.julialang.org/t/undefined-symbol/41165/6 "2020-06-11T11:44:37Z")

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> [@Ccall to libgsl fails](https://discourse.julialang.org/t/ccall-to-libgsl-fails/11957):
>
> Hello, I am trying to use ccall in julia for the first time and I can’t make a simple call to libgsl: ccall((:gsl\_sf\_gamma\_inc\_Q, :libgsl), Cdouble, (Cdouble, Cdouble), 0.2, 0.2) returns: ERROR: LoadError: error compiling anonymous: could not load library "libgsl" /usr/lib/libgsl.so: undefined symbol: cblas\_ctrmv What is the problem here? I have cblas installed… Thanks for help.

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