1 files changed, 3 insertions, 1 deletions
diff --git a/configure b/configure
index b824fd35..885a531f 100755
--- a/configure
+++ b/configure
@@ -159,7 +159,9 @@ yacc_is_newer_bison=
 nm='$(cross)$(tool_prefix)nm'
 opt_flags='-O2 -fno-stack-protector'
 lang_flags='-ansi -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200112 -D_GNU_SOURCE'
-diag_flags='-Wall -Wextra -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=strict-prototypes'
+diag_flags="-Wall -Wextra -Werror=implicit-function-declaration \
+           -Werror=missing-prototypes -Werror=strict-prototypes \
+           -Werror=old-style-declaration -Werror=old-style-definition"
 debug_flags=-g
 debug_only_flags=-DTXR_DEBUG
 debug_also=