Build error while compiling on Fedora 40

[ycollet]

I am trying to build alsacap on Fedora 40 and met a build error:

make[1]: Leaving directory '/builddir/build/BUILD/alsacap-master/src'
alsacap.c: In function ‘main’:
alsacap.c:129:23: error: implicit declaration of function ‘isdigit’ [-Wimplicit-function-declaration]
  129 |       if( !argpar || !isdigit(*argpar) ) errnumarg('C');
      |                       ^~~~~~~
alsacap.c:34:1: note: include ‘<ctype.h>’ or provide a declaration of ‘isdigit’
   33 | #include <alsa/asoundlib.h>
  +++ |+#include <ctype.h>
   34 | #include <errno.h>
alsacap.c:159:35: error: implicit declaration of function ‘parse_alsaformat’; did you mean ‘parse_alsaformats’? [-Wimplicit-function-declaration]
  159 |       options.hwparams[hwpind++]= parse_alsaformat(argpar);
      |                                   ^~~~~~~~~~~~~~~~
      |                                   parse_alsaformats
alsacap.c: At top level: