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diff --git a/configure.ac b/configure.ac
index 6766df2..bc503d6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -177,13 +177,14 @@ AS_CASE(["$host_os:$build_os"],
# clang version 1.0 (http://llvm.org/svn/llvm-project/cfe/tags/Apple/clang-23 exported)
# Apple clang version 2.0 (tags/Apple/clang-137) (based on LLVM 2.9svn)
# Apple clang version 2.1 (tags/Apple/clang-163.7.1) (based on LLVM 3.0svn)
- AS_IF([! $CC -E -xc - <<SRC >/dev/null], [
- @%:@if defined __APPLE_CC__ && defined __clang_major__ && __clang_major__ < 3
- @%:@error premature clang
- @%:@endif
-SRC
- AC_MSG_ERROR([clang version 3.0 or later is required])
- ])],
+ AC_PREPROC_IFELSE(
+ [AC_LANG_PROGRAM([
+ @%:@if defined __APPLE_CC__ && defined __clang_major__ && __clang_major__ < 3
+ @%:@error premature clang
+ @%:@endif
+ ])],
+ [],
+ [AC_MSG_ERROR([clang version 3.0 or later is required])])],
[openbsd*:openbsd*], [
AC_CHECK_TOOLS(CC, [cc])
])
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