dnl Switch to C++ language mode for the following libraries and headers.
AC_LANG([C++])
-AX_CXX_COMPILE_STDCXX_11
+AX_CXX_COMPILE_STDCXX([11])
dnl Make sure all the necessary standard headers are installed on the system.
GINAC_STD_CXX_HEADERS
GINACLIB_LIBS='-L${libdir} -lginac'
AC_LIB_LINKFLAGS_FROM_LIBS([GINACLIB_RPATH], [$GINACLIB_LIBS])
-dnl Check for data types which are needed by the hash function
-dnl (golden_ratio_hash).
-AC_CHECK_TYPE(long long)
-
dnl Check for stuff needed for building the GiNaC interactive shell (ginsh).
AC_CHECK_HEADERS(unistd.h)
GINAC_HAVE_RUSAGE