I have just started programming in linux and I am porting some of my software. I need to use the math functions. I was getting errors about "undefined reference sqrt" when compiling with gcc. I thought it was something wrong with my code, so I checked the man pages for ''sqrt'' and made a small test program which has the same error. #include int main () { double test_var; test_var = sqrt(3.00f); return 0; } I used this line to compile the file: gcc -o test test.c I am using Mandrake 8.1, gcc 2.9.6 and glibc 2.2.4 I am I missing something? thanks in advance for any help!

make sure the function is declared in "math.h" and that you are binding "glibc" correctly and it contains the "sqrt" function definition.

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thanks for the help, it pointed me to the problem. Other people have been having the the problem. You need to add -lm to link the maths library.