--- configure.org	2020-12-15 00:39:00 +0000
+++ configure	2020-12-15 00:39:40 +0000
@@ -15285,7 +15285,7 @@
 STD_CFLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wpointer-arith -Wno-missing-field-initializers -Wformat -Wshadow"
 
 # These should be always errors
-STD_CFLAGS="$STD_CFLAGS -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=format-security -Werror=parentheses -Werror=implicit -Werror=strict-prototypes"
+STD_CFLAGS="$STD_CFLAGS -Werror=missing-prototypes -Werror=format-security -Werror=parentheses -Werror=strict-prototypes"
 
 # Fortify the sources by default
 STD_CPPFLAGS="-D_FORTIFY_SOURCE=2"