[CMake] A question about cache variables

[mina adel]

Hi All,
I have a problem with cache variables in cmake.

I want to check the combiler for a certain flag -C99 flag. So, I used the 
following statement
CHECK_C_COMPILER_FLAG("-C99" FLAG_OK)

The problem is that we I ran cmake for the first time it said that c99 is not 
found and set the FLAG_OK variable in CMakeCache.txt to 0.

Now, I fixed the problem =in the compiler to make it support -C99. But cmake 
doesnot check the flag any more and just keep saying not found. This is becuase 
the FLAG_OK is already equals to 0 in cache file.

Is there any way to delete the cahce variable. or force cmake to check for the 
flag every time I run it?

Thanks for your help
Mina

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