add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# From https://sourceforge.net/projects/lcms/files/lcms/2.8
sha1 e9535ec4a572b8fc7a1c405c35e6f4dc97714197 lcms2-2.8.tar.gz
# Locally computed:
sha256 66d02b229d2ea9474e62c2b6cd6720fde946155cd1d0d2bffdab829790a0fb22 lcms2-2.8.tar.gz