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-rw-r--r--gmk-default.scm1
1 files changed, 1 insertions, 0 deletions
diff --git a/gmk-default.scm b/gmk-default.scm
index 9aca54a..4dabe25 100644
--- a/gmk-default.scm
+++ b/gmk-default.scm
@@ -20,6 +20,7 @@
;; In GNU make, "false" is the empty string
((or (not x)
(unspecified? x)
+ (variable? x)
(null? x)
(and (string? x) (string-null? x)))
#f)