Xcursor.h not found but X11_Xcursor_INCLUDE_PATH is set correctly

[mahmoodn]

On a system with no root access, I manually extracted libxcursor-dev to a folder and set the proper variables in ccmake ../src/ command.

mnaderan@fury0:/mnt/local/mnaderan/op/optix_advanced_samples/build$ grep -r X11_Xcursor_INCLUDE_PATH .
./CMakeCache.txt:X11_Xcursor_INCLUDE_PATH:PATH=/mnt/local/mnaderan/op/libxcursor-dev/include
./CMakeCache.txt://ADVANCED property for variable: X11_Xcursor_INCLUDE_PATH
./CMakeCache.txt:X11_Xcursor_INCLUDE_PATH-ADVANCED:INTERNAL=1
./CMakeCache.txt://MODIFIED property for variable: X11_Xcursor_INCLUDE_PATH
./CMakeCache.txt:X11_Xcursor_INCLUDE_PATH-MODIFIED:INTERNAL=ON

However, make fails with this message

mnaderan@fury0:/mnt/local/mnaderan/op/optix_advanced_samples/build$ make
Scanning dependencies of target glfw
[  0%] Building C object support/glfw/src/CMakeFiles/glfw.dir/context.c.o
cc1: warning: command line option ‘-std=c++11’ is valid for C++/ObjC++ but not for C
In file included from /mnt/local/mnaderan/op/optix_advanced_samples/src/support/glfw/src/internal.h:169:0,
                 from /mnt/local/mnaderan/op/optix_advanced_samples/src/support/glfw/src/context.c:28:
/mnt/local/mnaderan/op/optix_advanced_samples/src/support/glfw/src/x11_platform.h:39:10: fatal error: X11/Xcursor/Xcursor.h: No such file or directory
 #include <X11/Xcursor/Xcursor.h>
          ^~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
support/glfw/src/CMakeFiles/glfw.dir/build.make:62: recipe for target 'support/glfw/src/CMakeFiles/glfw.dir/context.c.o' failed
make[2]: *** [support/glfw/src/CMakeFiles/glfw.dir/context.c.o] Error 1
CMakeFiles/Makefile2:191: recipe for target 'support/glfw/src/CMakeFiles/glfw.dir/all' failed
make[1]: *** [support/glfw/src/CMakeFiles/glfw.dir/all] Error 2
Makefile:129: recipe for target 'all' failed
make: *** [all] Error 2

In fact, the file exists

mnaderan@fury0:/mnt/local/mnaderan/op/optix_advanced_samples/build$ ls ../../libxcursor-dev/include/X11/Xcursor/Xcursor.h

How can I fix that?