dnl ----------------------------------------------------------------------dnl This whole bit snagged from libgfortran. sinclude(../libtool.m4)sinclude(../config/enable.m4)sinclude(../config/cet.m4)dnl The lines below arrange for aclocal not to bring an installeddnl libtool.m4 into aclocal.m4, while still arranging for automake todnl add a definition of LIBTOOL to Makefile.in.ifelse(,,,[AC_SUBST(LIBTOOL)AC_DEFUN([AM_PROG_LIBTOOL])AC_DEFUN([AC_LIBTOOL_DLOPEN])AC_DEFUN([AC_PROG_LD])]) dnl Check whether POSIX's signgam is defined in math.h.AC_DEFUN([LIBQUAD_CHECK_MATH_H_SIGNGAM], [  AC_CACHE_CHECK([whether the math.h includes POSIX's signgam],                 libgfor_cv_have_math_h_signgam, [  save_CFLAGS="$CFLAGS"  CFLAGS="$CFLAGS -Werror"  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <math.h>void foo(void) { signgam = 1; }]], [])],                    libgfor_cv_have_math_h_signgam=yes,                    libgfor_cv_have_math_h_signgam=no)  CFLAGS="$save_CFLAGS"])  if test $libgfor_cv_have_math_h_signgam = yes; then    AC_DEFINE(HAVE_MATH_H_SIGNGAM, 1,      [Define to 1 if the math.h includes POSIX's signgam.])  fi])