diff --git a/man/Makefile.am b/man/Makefile.am
index 1c53f63..11514d5 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -6,20 +6,20 @@
 AM_V_XSLT_ = $(AM_V_XSLT_$(AM_DEFAULT_VERBOSITY))
 AM_V_XSLT_0 = @echo "  XSLT    " $@;
 
+XSLT = $(if $(XSLTPROC), $(XSLTPROC), xsltproc)
+
 if BUILD_TOOLS
 dist_man_MANS = $(MAN5) $(MAN8) $(MAN_STUB)
 modules.dep.bin.5: modules.dep.5
 endif
 
 EXTRA_DIST = $(MAN5:%.5=%.xml) $(MAN8:%.8=%.xml)
-
-XSLTPROC_FLAGS = \
-	--nonet \
-	--stringparam man.output.quietly 1 \
-	--param funcsynopsis.style "'ansi'"
-
 CLEANFILES = $(dist_man_MANS)
 
 %.5 %.8: %.xml
-	$(AM_V_XSLT)$(XSLTPROC) $(XSLTPROC_FLAGS) \
+	$(AM_V_XSLT)$(XSLT) \
+		-o $@ \
+		--nonet \
+		--stringparam man.output.quietly 1 \
+		--param funcsynopsis.style "'ansi'" \
 		http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl $<