The m4 macros (autoreconf) and ./configure is too slow when it can be not. Of course './configure -C' may speed up running it a bit. Still not fast enough. I r

The m4 macros (autoreconf) and ./configure is too slow when it can be not. Of course './configure -C' may speed up running it a bit. Still not fast enough. I really feel a need for something like AC_TRUST_HOST or AC_TRUST_DISTRO or something like that would not check for each header or each function in some library. Instead it will check the version of GCC, libc, and compile some (hopefully just one) program and test. Of course the common tests shall be skipped only in popular distributions. Say, Debian, Arch, Fedora (and their derivatives), to name a few.