# png Android linking problem

**URL:** https://discourse.vtk.org/t/png-android-linking-problem/1311
**Category:** Development
**Created:** [July 9, 2019, 11:46am UTC](https://discourse.vtk.org/t/png-android-linking-problem/1311 "2019-07-09T11:46:42Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![ben.boeckel](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/b/ea5d25/32.png) [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)
#### Post date: [July 9, 2019, 1:26pm UTC](https://discourse.vtk.org/t/png-android-linking-problem/1311/2 "2019-07-09T13:26:13Z")

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We patch our PNG import to disable all optimization bits (our copies tend to be bare-bones and minimal for ease of porting the build system). We have `ThirdParty/png/vtkpng/pngpriv.h:#define PNG_ARM_NEON_OPT 0`. Is there a reason this isn’t working for you? It does work on our Android dashboard AFAICT: [https://open.cdash.org/buildSummary.php?buildid=5996639](https://open.cdash.org/buildSummary.php?buildid=5996639)

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