How do I get a specific range of numbers from rand()?, C (gcc)

How do I get a specific range of numbers from rand()?

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Compilation time: 0.13 sec, absolute service time: 0,21 sec

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Error(s):

source_file.c: In function ‘nextInt’:
source_file.c:13:26: warning: implicit declaration of function ‘next’ [-Wimplicit-function-declaration]
         return n * (long)next(31) >> 31;
                          ^
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
/tmp/ccKMi5Ww.o: In function `nextInt':
source.c:(.text+0x28): undefined reference to `next'
source.c:(.text+0x48): undefined reference to `next'
collect2: error: ld returned 1 exit status

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