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* m4: resolve autoconf-2.68 warningsJan Engelhardt2011-12-171-2/+2
| | | | | | | | | | Newer autoconf desires proper full quoting and use of AC_LANG_SOURCE. Import new m4 file from git://dev.medozas.de/m4_jengelh. m4/gcc4_visibility.m4:4: CHECK_GCC_FVISIBILITY is expanded from... configure.ac:15: the top level configure.ac:15: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
* build: tag function headers rather than decls as exportedJan Engelhardt2010-11-191-0/+21
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>