Hello Johan, On Wed, May 28, 2008 at 11:08:22AM +0200, Johan Oudinet wrote: > In my configure.ac, I have: > AC_CHECK_HEADERS([gmp.h], , AC_MSG_ERROR([This package needs libgmp])) > AC_CHECK_HEADERS([gmpxx.h], , AC_MSG_ERROR([This package needs libgmpxx])) > > And when I run ./configure, I have: > checking gmp.h usability... yes > checking gmp.h presence... yes > checking for gmp.h... yes > checking gmpxx.h usability... no > checking gmpxx.h presence... no > checking for gmpxx.h... no > configure: error: This package needs libgmpxx I'd look in config.log to see why. Is gmpxx.h by chance a C++ header and gcc fails to compile it? If yes, you may want to wrap the second check with AC_LANG_PUSH(C++) and AC_LANG_POP. With kind regards, -- Baurzhan Ismagulov http://www.kz-easy.com/ _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf