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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 aae2456d5..02fc411f7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -116,6 +116,7 @@ UL_WARN_ADD([-Wnested-externs])
UL_WARN_ADD([-Wpointer-arith])
UL_WARN_ADD([-Wstrict-prototypes])
UL_WARN_ADD([-Wformat-security])
+UL_WARN_ADD([-Wimplicit-function-declaration])
AC_SUBST([WARN_CFLAGS])
UL_WARN_ADD([-Wno-clobbered], [BSD_WARN_CFLAGS])