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   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       gethostname():
           Since glibc 2.12: _BSD_SOURCE || _XOPEN_SOURCE >= 500
           || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200112L

gcc  -funroll-loops -O3 -ansi -std=c99 -pedantic-errors -Wall -I/usr/include/cfitsio  -c main.c
main.c: In function 'main':
main.c:251: error: implicit declaration of function 'gethostname'
main.c:21: warning: unused variable 'scatterksumSubstamps'
main.c:21: warning: unused variable 'meanksumSubstamps'
make: *** [main.o] Error 1

gcc  -funroll-loops -O3 -ansi -std=gnu99 -pedantic-errors -Wall -I/usr/include/cfitsio  -c extractkern.c
extractkern.c: In function 'make_kernel':
extractkern.c:439: error: 'rPixX' undeclared (first use in this function)
extractkern.c:439: error: (Each undeclared identifier is reported only once
extractkern.c:439: error: for each function it appears in.)
extractkern.c:440: error: 'rPixY' undeclared (first use in this function)
make: *** [extractkern.o] Error 1

CFITSIOINCDIR =  /usr/include/cfitsio/include
LIBDIR        =  /usr/include/cfitsio/lib

 /usr/local/hotpants-master# gcc -funroll-loops -O3 -ansi -std=gnu99 -pedantic-errors -Wall -I/usr/include/cfitsio/include -D_GNU_SOURCE  -c main.c 
main.c: In function ‘main’:
main.c:21:59: warning: "/*" within comment [-Wcomment]
   21 |     /*double      meanksumSubstamps,scatterksumSubstamps; /* mean and scatter of ksum */
      |                                                            
main.c:562:38: warning: ‘%d’ directive writing between 1 and 10 bytes into a region of size 4 [-Wformat-overflow=]
  562 |             sprintf(ttype[k], "Region%d", k);
      |                                      ^~
main.c:562:31: note: directive argument in the range [0, 2147483646]
  562 |             sprintf(ttype[k], "Region%d", k);
      |                               ^~~~~~~~~~
In file included from /usr/include/stdio.h:894,
                 from main.c:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:38:10: note: ‘__builtin___sprintf_chk’ output between 8 and 17 bytes into a destination of size 10
   38 |   return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   39 |                                   __glibc_objsize (__s), __fmt,
      |                                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   40 |                                   __va_arg_pack ());
      |                                   ~~~~~~~~~~~~~~~~~
main.c:1870:30: warning: ‘__builtin___sprintf_chk’ may write a terminating nul past the end of the destination [-Wformat-overflow=]
 1870 |         sprintf(hInfo, "%s %s", hInfo, argv[i]);
      |                              ^
In file included from /usr/include/stdio.h:894,
                 from main.c:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:38:10: note: ‘__builtin___sprintf_chk’ output 2 or more bytes (assuming 2049) into a destination of size 2048
   38 |   return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   39 |                                   __glibc_objsize (__s), __fmt,
      |                                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   40 |                                   __va_arg_pack ());
      |                                   ~~~~~~~~~~~~~~~~~