$ g++ -D__KERNEL__ -I/usr/src/linux-2.4/include/linux/ cc.cc -o cc cc.cc:1:27: linux/cpufreq.h: No such file or directory cc.cc: In function `int main()': cc.cc:4: `cpufreq_get' undeclared (first use this function) cc.cc:4: (Each undeclared identifier is reported only once for each function it appears in.)