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-rw-r--r--Makefile4
1 files changed, 2 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index a466659c8d..87c99ac409 100644
--- a/Makefile
+++ b/Makefile
@@ -119,6 +119,6 @@ endif
ifndef USE_PROPER_QC
# PropEr needs to be installed for property checking
# http://proper.softlab.ntua.gr/
-USE_PROPER_QC := $(shell erl -noshell -eval 'io:format({module, proper} =:= code:ensure_loaded(proper)), halt().')
-ERLC_OPTS += $(call boolean_macro,$(USE_PROPER_QC),use_proper_qc)
+USE_PROPER_QC = $(shell erl -noshell -eval 'io:format({module, proper} =:= code:ensure_loaded(proper)), halt().')
+ERLC_OPTS += $(call boolean_macro,$(USE_PROPER_QC),use_proper_qc)
endif