Server does not build, my_addr_resolve.c:185:3: error: ‘for’ loop initial declarations are only allowed in C99 mode

 19%] Building C object mysys/CMakeFiles/mysys.dir/my_addr_resolve.c.o

/src/10.1/mysys/my_addr_resolve.c: In function ‘my_addr_resolve’:

/src/10.1/mysys/my_addr_resolve.c:155:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]

   ssize_t total_bytes_read = 0;

   ^

/src/10.1/mysys/my_addr_resolve.c:180:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]

   int filename_start = -1;

   ^

/src/10.1/mysys/my_addr_resolve.c:185:3: error: ‘for’ loop initial declarations are only allowed in C99 mode

   for (ssize_t i = 0; i < total_bytes_read; i++) {

   ^

/src/10.1/mysys/my_addr_resolve.c:185:3: note: use option -std=c99 or -std=gnu99 to compile your code

mysys/CMakeFiles/mysys.dir/build.make:2630: recipe for target 'mysys/CMakeFiles/mysys.dir/my_addr_resolve.c.o' failed

make[2]: *** [mysys/CMakeFiles/mysys.dir/my_addr_resolve.c.o] Error 1

CMakeFiles/Makefile2:8099: recipe for target 'mysys/CMakeFiles/mysys.dir/all' failed

make[1]: *** [mysys/CMakeFiles/mysys.dir/all] Error 2

Makefile:160: recipe for target 'all' failed

make: *** [all] Error 2