>> Am I missing something? > The gpio handling was changed several kernels ago, IIRC you need you > use libgpio now. > I think I built it some time ago and put it here > https://people.centos.org/pgreco/libgpiod/, let me know if it helps. >> I think I only needed to nstall these 3, but the 2nd one gives me some trouble: libgpiod-1.4.1-2.el7.armv7hl.rpm libgpiod-devel-1.4.1-2.el7.armv7hl.rpm libgpiod-utils-1.4.1-2.el7.armv7hl.rpm [root at localhost libgpiod.rpms]# rpm -ivh libgpiod-devel-1.4.1-2.el7.armv7hl.rpm error: Failed dependencies: libgpiodcxx.so.1 is needed by libgpiod-devel-1.4.1-2.el7.armv7hl is the 2nd one, libgpiod-devel-1.4.1-2.el7.armv7hl.rpm, the one that has the header files in it? When I compile something simple I found: $ make cc main.c -lgpiod -D CONSUMER=\"libgpiod-led\" -o libgpiod-led main.c:1:19: fatal error: gpiod.h: No such file or directory #include <gpiod.h> ^ I did a 'find' on the whole filesystem, I don't seem to have it anywhere. thanks, Ron