mandelbrot.c:93: undefined reference to `ceil'

[DennisFaucher]

dennis@nvidia-k8s:~/Documents/OpenCL/OpenCL-examples/mandelbrot$ make
gcc -std=c99 -Wall -DUNIX -g -DDEBUG -m64 -o mandelbrot mandelbrot.c clbuild.c -lOpenCL
In file included from /usr/include/CL/cl.h:32,
from defs.h:10,
from mandelbrot.c:5:
/usr/include/CL/cl_version.h:34:9: note: #pragma message: cl_version.h: CL_TARGET_OPENCL_VERSION is not defined. Defaulting to 220 (OpenCL 2.2)
34 | #pragma message("cl_version.h: CL_TARGET_OPENCL_VERSION is not defined. Defaulting to 220 (OpenCL 2.2)")
| ^~~~~~~
mandelbrot.c: In function ‘main’:
mandelbrot.c:62:4: warning: ‘clCreateCommandQueue’ is deprecated [-Wdeprecated-declarations]
62 | queue = clCreateCommandQueue(context, device, 0, &err);
| ^~~~~
In file included from defs.h:10,
from mandelbrot.c:5:
/usr/include/CL/cl.h:1781:1: note: declared here
1781 | clCreateCommandQueue(cl_context context,
| ^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/CL/cl.h:32,
from defs.h:10,
from clbuild.c:1:
/usr/include/CL/cl_version.h:34:9: note: #pragma message: cl_version.h: CL_TARGET_OPENCL_VERSION is not defined. Defaulting to 220 (OpenCL 2.2)
34 | #pragma message("cl_version.h: CL_TARGET_OPENCL_VERSION is not defined. Defaulting to 220 (OpenCL 2.2)")
| ^~~~~~~
/usr/bin/ld: /tmp/ccrQKADv.o: in function main': /home/dennis/Documents/OpenCL/OpenCL-examples/mandelbrot/mandelbrot.c:93: undefined reference to ceil'
collect2: error: ld returned 1 exit status
make: *** [Makefile:55: mandelbrot] Error 1