x86_64-managarm-gcc -pthread  -Wall -Wextra -Werror=implicit-function-declaration fmtmsg/fmtmsg.c -o fmtmsg/fmtmsg -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
fmtmsg/fmtmsg.c:4:10: fatal error: fmtmsg.h: No such file or directory
    4 | #include <fmtmsg.h>
      |          ^~~~~~~~~~
compilation terminated.