mkdir -p /tmp/build/r.watershed.opencl/bin
mkdir -p /tmp/build/r.watershed.opencl/etc
mkdir -p /tmp/build/r.watershed.opencl/docs/html
mkdir -p /tmp/build/r.watershed.opencl/docs/man
mkdir -p /tmp/build/r.watershed.opencl/docs/man/man1
test -d OBJ.x86_64-pc-linux-gnu || mkdir -p OBJ.x86_64-pc-linux-gnu
gcc  -O2 -std=gnu99 -m64   -I/usr/local/grass85/include -I/usr/local/grass85/include    -DPACKAGE=\""grassmods"\"   -I/usr/local/grass85/include -I/usr/local/grass85/include -DRELDIR=\"/tmp/grass_addons/r.watershed.opencl\" -o OBJ.x86_64-pc-linux-gnu/basin_labels.o -c basin_labels.c
In file included from basin_labels.h:6,
                 from basin_labels.c:22:
ocl_backend.h:10:10: fatal error: CL/cl.h: No such file or directory
   10 | #include <CL/cl.h>
      |          ^~~~~~~~~
compilation terminated.
make: *** [/usr/local/grass85/include/Make/Compile.make:32: OBJ.x86_64-pc-linux-gnu/basin_labels.o] Error 1