Laufwerksdrehzahl regulieren

/dev/sda7 on / type ext3 (rw,acl,user_xattr)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
debugfs on /sys/kernel/debug type debugfs (rw)
udev on /dev type tmpfs (rw)
devpts on /dev/pts type devpts (rw,mode=0620,gid=5)
/dev/sda8 on /home type ext3 (rw,acl,user_xattr)
/dev/sda1 on /windows/C type fuseblk (rw,noexec,nosuid,nodev,noatime,allow_other,default_permissions,blksize=4096)
/dev/sda5 on /windows/D type fuseblk (rw,noexec,nosuid,nodev,noatime,allow_other,default_permissions,blksize=4096)
/dev/sda6 on /windows/E type fuseblk (rw,noexec,nosuid,nodev,noatime,allow_other,default_permissions,blksize=4096)
securityfs on /sys/kernel/security type securityfs (rw)
/dev/sr0 on /media/SU1030.001 type iso9660 (ro,nosuid,nodev,noatime,uid=1000,utf8)

#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
int main(void)
{
    int fd = open("/dev/sdc", O_RDONLY);
    ioctl(fd, CDROM_SELECT_SPEED, 2);
}

> gcc -o slowcd slowcd.c
slowcd.c: In function ‘main’:
slowcd.c:7: error: ‘CDROM_SELECT_SPEED’ undeclared (first use in this function)
slowcd.c:7: error: (Each undeclared identifier is reported only once
slowcd.c:7: error: for each function it appears in.)