gcc couldn't locate slab.h in ubuntu 12.04?

Please correct me if I'm missing something here. Thanks for your inputs.

Header included in code: #include <linux/slab.h>

Code snippet from my file that's asking for memory allocation using "kmalloc()":

/* * Initialize memory. */ char* fs_ptr; fs_ptr = kmalloc((sizeof(char) * 20), GFP_USER); if (!fs_ptr) printf("Error allocating space in memory.\n"); }

Compile error:

$ make
gcc -g -Wall `pkg-config fuse --cflags` -c fs.c
fs.c:43:24: fatal error: linux/slab.h: No such file or directory
compilation terminated.

Ubuntu version Info.:

$ uname -a
Linux ubuntu 3.8.0-33-generic #48~precise1-Ubuntu SMP Thu Oct 24 16:28:06 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Location of header file, searching via 'locate':

$ locate slab.h
/usr/src/linux-headers-3.8.0-29/include/linux/slab.h
/usr/src/linux-headers-3.8.0-29-generic/include/linux/slab.h
/usr/src/linux-headers-3.8.0-31/include/linux/slab.h
/usr/src/linux-headers-3.8.0-31-generic/include/linux/slab.h
/usr/src/linux-headers-3.8.0-32/include/linux/slab.h
/usr/src/linux-headers-3.8.0-32-generic/include/linux/slab.h
/usr/src/linux-headers-3.8.0-33/include/linux/slab.h
/usr/src/linux-headers-3.8.0-33-generic/include/linux/slab.h

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