Doc: Minor build fix

diff --git a/doc/Makefile b/doc/Makefile
index 70b73943f300b158bc6ac570a57cc198fd5e8812..1206e55f1f78d51b59ba949900e4e0166d2df9c2 100644 (file)
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -8,6 +8,8 @@ srcdir=$(shell cd $(root-rel) ; pwd)
 srcdir_abs=$(srcdir)
 endif
 
+export TEXINPUTS := $(TEXINPUTS):$(srcdir_abs)/doc/tex
+
 # Force rebuilds
 .PHONY: prog.sgml bird.sgml