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Information

1. Read Standard linux compilation through Autoconf scripts section of compilation guide of ccextractor at following link
   https://github.com/CCExtractor/ccextractor/blob/master/docs/COMPILATION.MD
2. Compile CCExtractor using autoconf on linux and 64 bit operating system.
3. Check warning thrown from GPAC at time of compilation.
4. GPAC warnings are present because GPAC_64_BITS preprocesor flag is not present in 64 bit build.
5. GCC expects preprocessor flag through -D option https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html eg: gcc -DFLAG a.c

Actions

1. You need to define GPAC_64_BITS through changing Makefile.am
2. Make sure 32 bit build are not affected.
3. Raise a pull request with your Fix

Hints
Look for GPAC specific define in File: https://github.com/CCExtractor/ccextractor/blob/master/linux/Makefile.am
Search for: ccextractor_CFLAGS