How toL asterisk Dahdi - kernel issue

 Dahdi - You do not appear to have the sources for the kernel installed.

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Error : You do not appear to have the sources for the kernel installed
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While installing Dahdi you might get the above error.
follow the below steps to get rid of this issue

1. check the kernel version by typing uname -r for eg : # uname -r 
2. 6.18-194.3.1.el5 2.and check the actual kernel version by running yum install kernel 
3. if the versions are different copy the actual kernel version 
4. go to /boot/grub/grub.conf 
5. at last line change the kernel version to latest 
6. reboot 
7. go to Dahdi downloded directory 
8. make clean 
9. make all 
10. make install 
11. make config

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OR
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ln -s /usr/src/kernels/2.6.32-573.12.1.el6.x86_64/ build
reboot
reinstall dahdi

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OR

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cd /usr/src/asterisk/dahdi-linux-complete-3.1.0+3.1.0/

vi /usr/src/dahdi-linux-complete-3.1.0+3.1.0/linux/include/dahdi/kernel.h

change #include: </linux/pci-aspm.h> to </linux/pci.h>

make

make install

make install-config

cd tools

make clean

make

make install

make install-config

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