diff -Naur fontconfig-2.13.1.org/doc/Makefile.am fontconfig-2.13.1/doc/Makefile.am
--- fontconfig-2.13.1.org/doc/Makefile.am	2018-12-06 12:48:12.224002977 +0530
+++ fontconfig-2.13.1/doc/Makefile.am	2018-12-06 12:53:52.399685457 +0530
@@ -184,7 +184,7 @@
 	mv devel-man/manpage.refs func.refs &&	\
 	mv devel-man/*.3 . &&			\
 	$(RM) devel-man/manpage.* &&		\
-	rmdir devel-man || rm $@ || :
+	rm -rf devel-man || rm $@ || :
 confdir.sgml: $(srcdir)/confdir.sgml.in
 	$(AM_V_GEN) sed -e 's,@CONFDIR\@,${CONFDIR},' $(srcdir)/$@.in | awk '{if (NR > 1) printf("\n"); printf("%s", $$0);}' > $@
 ##
diff -Naur fontconfig-2.13.1.org/doc/Makefile.in fontconfig-2.13.1/doc/Makefile.in
--- fontconfig-2.13.1.org/doc/Makefile.in	2018-12-06 12:48:12.224002977 +0530
+++ fontconfig-2.13.1/doc/Makefile.in	2018-12-06 12:54:14.223677399 +0530
@@ -1374,7 +1374,7 @@
 @USEDOCBOOK_TRUE@	mv devel-man/manpage.refs func.refs &&	\
 @USEDOCBOOK_TRUE@	mv devel-man/*.3 . &&			\
 @USEDOCBOOK_TRUE@	$(RM) devel-man/manpage.* &&		\
-@USEDOCBOOK_TRUE@	rmdir devel-man || rm $@ || :
+@USEDOCBOOK_TRUE@	rm -rf devel-man || rm $@ || :
 @USEDOCBOOK_TRUE@confdir.sgml: $(srcdir)/confdir.sgml.in
 @USEDOCBOOK_TRUE@	$(AM_V_GEN) sed -e 's,@CONFDIR\@,${CONFDIR},' $(srcdir)/$@.in | awk '{if (NR > 1) printf("\n"); printf("%s", $$0);}' > $@
 @USEDOCBOOK_TRUE@$(DOC_FUNCS_SGML): $(DOC_FUNCS_FNCS) edit-sgml$(EXEEXT) $(srcdir)/func.sgml