add openbsd support
diff --git a/configure.ac b/configure.ac
index 0a4f01e..5e93a5d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -283,6 +283,11 @@
 	abi="elf"
 	AC_DEFINE([JEMALLOC_PURGE_MADVISE_FREE], [ ])
 	;;
+  *-*-openbsd*)
+	CFLAGS="$CFLAGS"
+	abi="elf"
+	AC_DEFINE([JEMALLOC_PURGE_MADVISE_FREE], [ ])
+	;;
   *-*-linux*)
 	CFLAGS="$CFLAGS"
 	CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"