Haxk: fix autoconf 2.64 builds

2.64 requires that the first use of AC_RUN_IFELSE is not wrapped inside
any other macros. Otherwise it will define the setup macros at the wrong
scope level and configure will break during the default type checks.

diff --git a/configure.in b/configure.in
index 0faa96491714d137d9463609484645f3e406802b..78ef4e4498c135f00f36a217fcf03a3d3da03c79 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -344,6 +344,10 @@ AC_ARG_ENABLE(debug-cbdata,
   fi
 ])
 
+dnl Nasty hack to get autoconf 2.64 on Linux to run.
+dnl all other uses of RUN_IFELSE are wrapped inside CACHE_CHECK which breaks on 2.64
+AC_RUN_IFELSE([AC_LANG_SOURCE([[ int main(int argc, char **argv) { return 0; } ]])],[],[],[])
+
 dnl This is a developer only option.. developers know how to set defines
 dnl
 dnl AC_ARG_ENABLE(xmalloc-debug,