** Languages
Integrate other Fortrans etc.
+** Picky compilers, e.g., gcc -Werror
+Many Autoconf-generated tests do the wrong thing if someone configures
+with CC='gcc -Werror' or with similar options. It would be nice if
+these tests worked better with picky compilers. This will require
+significant reworking in some cases, e.g., AC_CHECK_FUNCS will need
+to know the headers declaring the functions.
+
** AC_CHECK_FUNCS and AC_TRY_LINK_FUNC
I have still not understood what's the difference between the two
which requires to have two different sources: AC_LANG_CALL and