use libpath arg during build

[pawelru]

closes #195

[codecov-commenter]

Codecov Report

Merging #196 (cbcee23) into main (b82f540) will decrease coverage by 0.20%.
The diff coverage is 100.00%.

❗ Current head cbcee23 differs from pull request most recent head e4aeee7. Consider uploading reports for the commit e4aeee7 to get more accurate results

@@            Coverage Diff             @@
##             main     #196      +/-   ##
==========================================
- Coverage   80.83%   80.63%   -0.20%     
==========================================
  Files          19       19              
  Lines        1007     1007              
==========================================
- Hits          814      812       -2     
- Misses        193      195       +2     

Impacted Files	Coverage Δ
R/build.R	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[pawelru]

Hi @gaborcsardi can you please have a look? I think it's a quick fix out there. Not sure if you like the test case though.