$NetBSD$

Remove executable bit from header
--- Makefile.orig	2018-03-30 10:32:25.777679349 +0000
+++ Makefile
@@ -26,7 +26,7 @@ install: all
 	${MKDIR} -p ${DESTDIR}${PREFIX}/bin
 	${MKDIR} -p ${DESTDIR}${PREFIX}/include/intervaltree
 	${INSTALL} ${BIN} ${DESTDIR}${PREFIX}/bin
-	${INSTALL} IntervalTree.h ${DESTDIR}${PREFIX}/include/intervaltree
+	${INSTALL} -m644 IntervalTree.h ${DESTDIR}${PREFIX}/include/intervaltree
 
 install-strip: install
 	${STRIP} ${DESTDIR}${PREFIX}/bin/${BIN}