debug.h is already in $(spglib_h), which causes make install to fail
author: Miguel Dias Costa (National University of Singapore)
--- src/Makefile.in.orig	2016-04-26 16:21:29.900203000 +0800
+++ src/Makefile.in	2016-04-26 16:21:43.531192514 +0800
@@ -562,7 +562,7 @@
 version.h
 
 libsymspg_la_SOURCES = $(spglib_c) $(spglib_h)
-pkginclude_HEADERS = $(spglib_h) debug.h
+pkginclude_HEADERS = $(spglib_h)
 # libsymspg_la_LDFLAGS = -version-info 0:1:0
 libsymspg_la_LIBADD = -lm
 spglib_test_SOURCES = test.c $(spglib_c) $(spglib_h)
