diff -purN mandoc-1.14.4.orig/Makefile mandoc-1.14.4/Makefile
--- mandoc-1.14.4.orig/Makefile	2019-02-07 12:03:35.614493086 -0500
+++ mandoc-1.14.4/Makefile	2019-02-07 12:04:04.825552194 -0500
@@ -430,7 +430,7 @@ lib-install: libmandoc.so.$(SOVERSION)
 	$(INSTALL_LIB) libmandoc.so.$(SOVERSION) $(DESTDIR)$(LIBDIR)
 	ln -s libmandoc.so.$(SOVERSION) $(DESTDIR)$(LIBDIR)/libmandoc.so.$(SOMAJOR)
 	ln -s libmandoc.so.$(SOVERSION) $(DESTDIR)$(LIBDIR)/libmandoc.so
-	$(INSTALL_LIB) man.h mandoc.h mandoc_aux.h mdoc.h roff.h \
+	$(INSTALL_HDR) man.h mandoc.h mandoc_aux.h mdoc.h roff.h \
 		$(DESTDIR)$(INCLUDEDIR)
 	$(INSTALL_MAN) mandoc.3 mandoc_escape.3 mandoc_malloc.3 \
 		mansearch.3 mchars_alloc.3 tbl.3 $(DESTDIR)$(MANDIR)/man3
diff -purN mandoc-1.14.4.orig/configure mandoc-1.14.4/configure
--- mandoc-1.14.4.orig/configure	2018-08-08 10:51:51.000000000 -0400
+++ mandoc-1.14.4/configure	2019-02-07 12:04:04.826552196 -0500
@@ -119,6 +119,7 @@ MANM_TBL="tbl"
 INSTALL="install"
 INSTALL_PROGRAM=
 INSTALL_LIB=
+INSTALL_HDR=
 INSTALL_MAN=
 INSTALL_DATA=
 LN="ln -f"
@@ -523,6 +524,7 @@ exec > Makefile.local
 
 [ -z "${INSTALL_PROGRAM}" ] && INSTALL_PROGRAM="${INSTALL} -m 0555"
 [ -z "${INSTALL_LIB}"     ] && INSTALL_LIB="${INSTALL} -m 0444"
+[ -z "${INSTALL_HDR}"     ] && INSTALL_HDR="${INSTALL} -m 0444"
 [ -z "${INSTALL_MAN}"     ] && INSTALL_MAN="${INSTALL} -m 0444"
 [ -z "${INSTALL_DATA}"    ] && INSTALL_DATA="${INSTALL} -m 0444"
 
@@ -569,6 +571,7 @@ MANM_TBL	= ${MANM_TBL}
 INSTALL		= ${INSTALL}
 INSTALL_PROGRAM	= ${INSTALL_PROGRAM}
 INSTALL_LIB	= ${INSTALL_LIB}
+INSTALL_HDR	= ${INSTALL_HDR}
 INSTALL_MAN	= ${INSTALL_MAN}
 INSTALL_DATA	= ${INSTALL_DATA}
 LN		= ${LN}