use of undeclared identifier 'strchr'

[bnidia]

a@ubuntu:~/ft_printf_intra$ /bin/bash /home/ft_printf_intra/test.sh
➤ Object: obj/source_generator.o
clang++ -std=c++11 -Wall -Wextra -ferror-limit=999 -funroll-loops -Iinc -o obj/source_generator.o -c src/source_generator.cpp
src/source_generator.cpp:52:6: error: use of undeclared identifier 'strchr'
if (strchr("aAeEfFgGcs", convertion))
^
src/source_generator.cpp:54:6: error: use of undeclared identifier 'strchr'
if (strchr("idouxXDOU", convertion))
^
src/source_generator.cpp:102:8: error: use of undeclared identifier 'strchr'
if (!strchr("pcCS", convertion) && padd != NOPADD)
^
3 errors generated.
make: *** [Makefile:192: obj/source_generator.o] Error 1

[OrioPrisco]

adding the include <cstring> in inc/source-generator.h add the symbol for strchr, and solves the issue