--- configure.ac.orig	2020-11-09 02:33:57 UTC
+++ configure.ac
@@ -168,10 +168,6 @@ CC_CHECK_CFLAGS_APPEND([-Wall -Wdisabled-optimization 
 [-Wredundant-decls -Wcast-qual -Wwrite-strings -Wtype-limits -Wundef ]dnl
 [-Wmissing-prototypes -Wshadow])
 
-CC_CHECK_CFLAGS_APPEND([-Werror=implicit-function-declaration ]dnl
-                       [-Werror-implicit-function-declaration],
-                       [break;])
-
 CC_CHECK_WERROR
 AS_IF([test "x$enable_werror" = "xyes"], [
   CFLAGS="${CFLAGS} $cc_cv_werror"