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-rw-r--r--configure.ac3
1 files changed, 3 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 796dccd..28e10c0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -113,6 +113,9 @@ fi
AC_SUBST(PICFLAG)
AC_SUBST(DEFS)
+# Extra user-defined C flags.
+AC_SUBST([CFLAGS_EXTRA])
+
AH_TEMPLATE([_PTHREADS], [Indicates the use of pthreads (NetBSD).])
AH_TEMPLATE([AO_USE_NANOSLEEP],