as of version 4.3, with the inclusion of gnulib, make now appears to require c99 support in order to be compiled correctly.
since this is the case, the configure script should check if flags are necessary to enable c99 support, as several non-gnu compilers do not enable it by default. --- make-4.3/configure.ac 2020-01-19 12:32:59.000000000 -0800 +++ make-4.3.new/configure.ac 2020-05-28 18:02:55.214822187 -0700 @@ -37,6 +37,8 @@ AM_INIT_AUTOMAKE([1.16.1 foreign -Werror # Checks for programs. AC_USE_SYSTEM_EXTENSIONS AC_PROG_CC +# C99 is needed as of version 4.3 +AC_PROG_CC_C99 # Configure gnulib gl_EARLY
