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-rw-r--r--configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index e636253..606e644 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,2 +15,3 @@ AC_HEADER_STDC
AC_CHECK_FUNCS([timegm])
+AC_CHECK_HEADERS([ext/algorithm.h])