STDCXX issue

[Vincent Blondel]

Hi all,

I am totally new with auto tools :-)
When trying to make a very first project, I do encounter always the same
issue with _CXX_COMPILE_STDCXX macro.

Below the current content of both configure.ac and Makefile.am

$ configure.ac

AC_CONFIG_MACRO_DIRS([m4])
m4_pattern_allow([AC_PROG_CC_C99])
m4_include([m4/ax_check_compile_flag.m4])
m4_include([m4/ax_cxx_compile_stdcxx.m4])
m4_include([m4/ax_cxx_compile_stdcxx_11.m4])
AC_CONFIG_SRCDIR(configure.ac)
AM_CONFIG_HEADER(config.h)
AM_INIT_AUTOMAKE
AC_PROG_CC
AX_CHECK_COMPILE_FLAG([-std=gnu11], [CFLAGS+=" -std=gnu11"],
[AC_PROG_CC_C99])
AC_PROG_CXX
AX_CXX_COMPILE_STDCXX_11([ext], [optional])
AC_PROG_LIBTOOL
AC_CONFIG_FILES(Makefile)
AC_OUTPUT

$ cat Makefile.am

ACLOCAL_AMFLAGS = ${ACLOCAL_FLAGS} -I m4
bin_PROGRAMS = test
test_SOURCES = test.cc

$ ls -l m4

ax_check_compile_flag.m4
ax_check_openssl.m4
ax_cxx_compile_stdcxx.m4
ax_cxx_compile_stdcxx_11.m4
libtool.m4
lt~obsolete.m4
ltoptions.m4
ltsugar.m4
ltversion.m4

Following commands seem to be OK ...

aclocal
autoreconf --force --install
automake --add-missing

BUT when doing the configure script .... I get the same error ...

$ ./configure
./configure: line 2428: syntax error near unexpected token
`AX_CXX_COMPILE_STDCXX'
./configure: line 2428: `AX_REQUIRE_DEFINED(AX_CXX_COMPILE_STDCXX)'

Thanks in advance for your help :-)
Best Regards,
Vincent