I believe that someone forgot to commit the header file to github:

[ 64%] Building CXX object CMakeFiles/indi_ieqlegacy_telescope.dir/drivers/telescope/ieqprolegacydriver.cpp.o
/root/indi/libindi/drivers/telescope/ieqprolegacydriver.cpp:21:32: fatal error: ieqprolegacydriver.h: No such file or directory
#include "ieqprolegacydriver.h"
^
compilation terminated.

I verified on GitHub site and the file is not there, maybe it's only on another branch.

Mastria.

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