configure: WARNING: no indent program found: make indent target will not function
ar: `u' modifier ignored since `D' is the default (see `U')
scanflags.c:65:13: warning: incompatible integer to pointer conversion passing 'long' to parameter of type 'const char *' [-Wint-conversion]
            (long)sizeof(scanflags_t));
            ^~~~~~~~~~~~~~~~~~~~~~~~~
./flexdef.h:912:60: note: passing argument to parameter here
extern void lerrsf_fatal PROTO ((const char *, const char *));
                                                           ^
1 warning generated.
main.c:1581:5: warning: add explicit braces to avoid dangling else [-Wdangling-else]
                         else
                         ^
1 warning generated.
buf.c:101:60: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
    for (dst = t + sprintf (t, "#line %d \"", lineno), src = filename; *src; *dst++ = *src++)
                                                           ^ ~~~~~~~~
1 warning generated.
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY