I did a quick test on OS X (Lion) and the build fails.
mekboek:openvpn_src brabander$ git clone --branch build
https://github.com/alonbl/openvpn.git openvpn_alonbl
mekboek:openvpn_src brabander$ cd openvpn_alonbl/
mekboek:openvpn_alonbl brabander$ autoreconf -i -v
autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal -I m4
configure.ac:337: warning: AC_CACHE_VAL(VAR, ...): suspicious presence
of an AC_DEFINE in the second argument, where no actions should be
taken
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/general.m4:1905:
AC_CACHE_VAL is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/general.m4:1918:
AC_CACHE_CHECK is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/m4sugar/m4sh.m4:523:
AS_IF is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/types.m4:243:
AC_CHECK_TYPE is expanded from...
m4/ax_socklen_t.m4:63: AX_TYPE_SOCKLEN_T is expanded from...
configure.ac:337: the top level
autoreconf: configure.ac: tracing
configure.ac:337: warning: AC_CACHE_VAL(VAR, ...): suspicious presence
of an AC_DEFINE in the second argument, where no actions should be
taken
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/general.m4:1905:
AC_CACHE_VAL is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/general.m4:1918:
AC_CACHE_CHECK is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/m4sugar/m4sh.m4:523:
AS_IF is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/types.m4:243:
AC_CHECK_TYPE is expanded from...
m4/ax_socklen_t.m4:63: AX_TYPE_SOCKLEN_T is expanded from...
configure.ac:337: the top level
autoreconf: running: glibtoolize --copy
glibtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, `.'.
glibtoolize: copying file `./ltmain.sh'
glibtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
glibtoolize: copying file `m4/libtool.m4'
glibtoolize: copying file `m4/ltoptions.m4'
glibtoolize: copying file `m4/ltsugar.m4'
glibtoolize: copying file `m4/ltversion.m4'
glibtoolize: copying file `m4/lt~obsolete.m4'
configure.ac:337: warning: AC_CACHE_VAL(VAR, ...): suspicious presence
of an AC_DEFINE in the second argument, where no actions should be
taken
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/general.m4:1905:
AC_CACHE_VAL is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/general.m4:1918:
AC_CACHE_CHECK is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/m4sugar/m4sh.m4:523:
AS_IF is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/types.m4:243:
AC_CHECK_TYPE is expanded from...
m4/ax_socklen_t.m4:63: AX_TYPE_SOCKLEN_T is expanded from...
configure.ac:337: the top level
autoreconf: running: /usr/bin/autoconf
configure.ac:337: warning: AC_CACHE_VAL(VAR, ...): suspicious presence
of an AC_DEFINE in the second argument, where no actions should be
taken
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/general.m4:1905:
AC_CACHE_VAL is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/general.m4:1918:
AC_CACHE_CHECK is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/m4sugar/m4sh.m4:523:
AS_IF is expanded from...
/private/var/tmp/autoconf/autoconf-17.1~539/SRC/autoconf/lib/autoconf/types.m4:243:
AC_CHECK_TYPE is expanded from...
m4/ax_socklen_t.m4:63: AX_TYPE_SOCKLEN_T is expanded from...
configure.ac:337: the top level
configure.ac:31: error: possibly undefined macro: AC_DEFINE
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
configure.ac:545: error: possibly undefined macro: AC_CHECK_LIB
configure:14349: error: possibly undefined macro: AS_VAR_IF
autoreconf: /usr/bin/autoconf failed with exit status: 1
