--- a/src/configure.ac
+++ b/src/configure.ac
@@ -23,7 +23,14 @@
AC_SYS_LARGEFILE
-AC_CHECK_HEADERS(sys/mount.h sys/statfs.h sys/statvfs.h sys/vfs.h)
+# OpenBSD needs sys/param.h for mount.h to compile
+AC_CHECK_HEADERS([sys/param.h])
+
+AC_CHECK_HEADERS([sys/mount.h sys/statfs.h sys/statvfs.h sys/vfs.h], [], [],
+[#ifdef HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
+])
# Use specific 'file' command ? (Useful on solaris to specify
# /usr/local/bin/file instead of the system's which doesn't understand '-i'