Description: Fix parallel build
This happened here : https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=976906
Solution found here : https://www.gnu.org/software/automake/manual/html_node/Yacc-and-Lex.html
Author: Frédéric Bonnard <frediz@debian.org>
---
This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -8,6 +8,8 @@
 AM_YFLAGS = -d -p `${SED} -n 's/.*_\(.*\)/pll_\1_/p' <<<"$*"`
 AM_LFLAGS = -P `${SED} -n 's/.*_\(.*\)/pll_\1_/p' <<<"$*"` -o lex.yy.c
 
+BUILT_SOURCES = parse_rtree.h parse_utree.h
+
 libpll_la_SOURCES=\
 fasta.c \
 gamma.c \
