Index: buildsys.mk.in
==================================================================
--- buildsys.mk.in
+++ buildsys.mk.in
@@ -210,11 +210,11 @@
 	done
 
 	if test x"${includesubdir}" = x"${COPY_HEADERS_IF_SUBDIR}"; then \
 		for i in "" ${INCLUDES}; do \
 			test x"$$i" = x"" && continue; \
-			${MKDIR_P} ${COPY_HEADERS_DESTINATION} || exit $$?; \
+			${MKDIR_P} $$(dirname ${COPY_HEADERS_DESTINATION}/$$i) || exit $$?; \
 			${INSTALL} -m 644 $$i ${COPY_HEADERS_DESTINATION}/$$i || exit $$?; \
 		done \
 	fi
 
 ${AMIGA_LIB} ${AMIGA_LIB_NOINST}: ${EXT_DEPS} ${AMIGA_LIB_OBJS_START} ${AMIGA_LIB_OBJS} ${AMIGA_LIB_OBJS_EXTRA}
@@ -731,11 +731,11 @@
 
 	if test x"${INSTALL_INCLUDES}" = x"yes"; then \
 		for i in "" ${INCLUDES}; do \
 			test x"$$i" = x"" && continue; \
 			${INSTALL_STATUS}; \
-			if ${MKDIR_P} ${DESTDIR}${includedir}/${includesubdir} && ${INSTALL} -m 644 $$i ${DESTDIR}${includedir}/${includesubdir}/$$i; then \
+			if ${MKDIR_P} $$(dirname ${DESTDIR}${includedir}/${includesubdir}/$$i) && ${INSTALL} -m 644 $$i ${DESTDIR}${includedir}/${includesubdir}/$$i; then \
 				${INSTALL_OK}; \
 			else \
 				${INSTALL_FAILED}; \
 			fi \
 		done \