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--- a/src/recollinstall.in
+++ b/src/recollinstall.in
@@ -30,7 +30,7 @@
    fi
 fi
 
-INSTALL=${INSTALL:=install -c}
+INSTALL=${INSTALL:="install -c"}
 STRIP=${STRIP:=strip}
 
 test -x qtgui/recoll || fatal "qtgui/recoll does not exist." \