On Tue, 27 Nov 2012, m.roth at 5-cent.us wrote: > Michael Hennebry wrote: > <snip> >> 'Twould be nice just to know what the messages mean. >> I get the impression that output like this are indications of a problem >> that >> is not specific to the particular software that I was trying to compile: >> autoconf wrote: >>> checking for stdint.h... (cached) yes >>> checking limits.h usability... yes >>> checking limits.h presence... no >>> configure: WARNING: limits.h: accepted by the compiler, rejected by the >>> preprocessor! >>> configure: WARNING: limits.h: proceeding with the compiler's result >>> checking for limits.h... yes >>> checking for unistd.h... (cached) yes >>> checking sys/time.h usability... yes >> >> limits.h: >> usable, not present, accepted by the compiler, rejected by the >> preprocessor. >> >> Huh? > > Here's a question: *which* limits.h? On my 6.3 system, if I locate > limits.h, I get: > /usr/include/limits.h > /usr/include/c++/4.4.4/tr1/limits.h > /usr/include/linux/limits.h > /usr/lib/gcc/x86_64-redhat-linux/4.4.4/include/limits.h > /usr/lib/gcc/x86_64-redhat-linux/4.4.4/include/syslimits.h > /usr/share/doc/pam-1.1.1/html/sag-pam_limits.html > /usr/share/man/man0p/limits.h.0p.gz > /usr/src/kernels/2.6.32-279.1.1.el6.x86_64/include/linux/limits.h > /usr/src/kernels/2.6.32-279.11.1.el6.x86_64/include/linux/limits.h > /usr/src/kernels/2.6.32-279.2.1.el6.x86_64/include/linux/limits.h > /usr/src/kernels/2.6.32-279.5.2.el6.x86_64/include/linux/limits.h > /usr/src/kernels/2.6.32-279.9.1.el6.x86_64/include/linux/limits.h Don't know for sure. I have even more. >From experiment, gcc and cpp search the same directories: /usr/local/include /usr/lib/gcc/i686-redhat-linux/4.4.6/include /usr/include /usr/local/include does not have a limits.h . /usr/lib/gcc/i686-redhat-linux/4.4.6/include/limits.h has a #include_next <limits.h> that grabs /usr/include/limits.h . -- Michael hennebry at web.cs.ndsu.NoDak.edu "On Monday, I'm gonna have to tell my kindergarten class, whom I teach not to run with scissors, that my fiance ran me through with a broadsword." -- Lily