acltx_package_amsmath

This macro check for a way to include amsmath and set amsmath to this way

AC_DEFUN([ACLTX_PACKAGE_AMSMATH],[
AC_REQUIRE([ACLTX_DEFAULT_CLASS])
AC_CACHE_CHECK([for amsmath],[ac_cv_latex_package_f_amsmath],[
_ACLTX_TEST([\documentclass{$defaultclass}
\usepackage{amsmath,amsfonts}
\begin{document}
\end{document}],[ac_cv_latex_package_f_amsmath])
if test $ac_cv_latex_package_f_amsmath = "yes" ;
then
    [ac_cv_latex_package_f_amsmath]="\\usepackage{amsmath,amsfonts}" ; export [ac_cv_latex_package_f_amsmath] ;
else
    _ACLTX_TEST([
    \documentclass{$defaultclass}
    \usepackage{amstex}
    \begin{document}
    \end{document}
    ],[ac_cv_latex_package_f_amsmath])
    if test $ac_cv_latex_package_f_amsmath = "yes" ;
    then
        [ac_cv_latex_package_f_amsmath]="\\usepackage{amstex}" ; export [ac_cv_latex_package_f_amsmath] ;
    else
        AC_MSG_ERROR([Unable to find amsmath])
    fi
fi
])
amsmath=$[ac_cv_latex_package_f_amsmath]; export amsmath;
AC_SUBST(amsmath)
])

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA