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-rw-r--r--share/mk/sys.mk3
1 files changed, 3 insertions, 0 deletions
diff --git a/share/mk/sys.mk b/share/mk/sys.mk
index 7d7cc62..bea1c71 100644
--- a/share/mk/sys.mk
+++ b/share/mk/sys.mk
@@ -52,6 +52,9 @@ META_MODE+= meta verbose
META_MODE+= silent=yes
.endif
.if !exists(/dev/filemon)
+.if ${UPDATE_DEPENDFILE:Uyes:tl} != "no" && !defined(NO_FILEMON)
+.error ${.newline}ERROR: The filemon module (/dev/filemon) is not loaded.
+.endif
META_MODE+= nofilemon
.endif
.endif
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