They are supposed to always be defined, with their value
reflecting the availability of the corresponding feature, so
using #ifdef or #if defined() with them is incorrect.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
---
 build-aux/syntax-check.mk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/build-aux/syntax-check.mk b/build-aux/syntax-check.mk
index 2ac8c5760f..067f47ac03 100644
--- a/build-aux/syntax-check.mk
+++ b/build-aux/syntax-check.mk
@@ -1347,6 +1347,11 @@ sc_rst_since:
 	halt='format :since: correctly' \
 	  $(_sc_search_regexp)
 
+sc_with_ifdef:
+	@prohibit='^# *(ifdef +|ifndef +|if.*defined\()WITH_' \
+	halt='do not use #ifdef or #if defined() for WITH_ macros' \
+	  $(_sc_search_regexp)
+
 
 ## ---------- ##
 ## Exceptions ##
-- 
2.43.2
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