[gccsdk] A challenge - suggestions appreciated

Hi

trying to compile a bunch of things, x11 is needed. Within that, compiling libxext6 fails with the following messages
---
checking whether malloc(0) returns NULL... yes
checking for XEXT... no
configure: error: Package requirements (xproto >= 7.0.13 x11 >= 1.6 xextproto >= 7.1.99) were not met:

Requested 'x11 >= 1.6' but version of X11 is 1.5.0

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
---

Obviously there is a dependance that I'm missing.. what is actually responsible for defining the version of X>

Thanks

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