1 files changed, 5 insertions, 2 deletions
diff --git a/t/Makefile b/t/Makefile
index f278324..49eaac5 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -1,6 +1,9 @@
 .SUFFIXES: .t .T .pdf
 TEST != ls *.t | sed 's/t$$/T/'
 
+TROFF ?= troff
+PDFROFF ?= troff | dpost | ps2pdf -
+
 all: $(TEST)
 
 g.tmac: ../g.tmac
@@ -9,7 +12,7 @@ g.tmac: ../g.tmac
 
 .t.T: g.tmac t.tmac
 	@echo -- $< -----------------------
-	@troff -x3 $< >/dev/null
+	@<$< $(TROFF) >/dev/null
 
 .t.pdf: g.tmac t.tmac
-	troff -x3 $< | dpost | ps2pdf - > $@
+	<$< $(PDFROFF) > $@