link_addr detection in configure always reports that link_addr is missing because it uses link_addr(NULL, NULL) in AC_LINK_IFELSE check with limited set of headers that doesn't define NULL. Fix by replacing 'NULL' with just '0'. --- configure.ac | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index 27531a1..cc9942a 100644 --- a/configure.ac +++ b/configure.ac @@ -2401,7 +2401,7 @@ AC_LINK_IFELSE([AC_LANG_PROGRAM( #include <net/if_dl.h> ]], [[ - link_addr(NULL, NULL)]])], + link_addr(0, 0)]])], [AC_DEFINE([HAVE_DECL_LINK_ADDR], [1], [whether link_addr is available])]) -- 1.7.11.5