fix build of slang

- add .NOTPARALLEL target to disable parallel make

Author: hgy59

cross/slang/Makefile

@@ -15,8 +15,4 @@ GNU_CONFIGURE = 1
 CONFIGURE_ARGS = --with-z=$(INSTALL_DIR)/$(INSTALL_PREFIX)
 CONFIGURE_ARGS += --with-pcre=$(INSTALL_DIR)/$(INSTALL_PREFIX)
 
-# disable parallel make
-# https://github.com/osresearch/heads/issues/385#issuecomment-382926111
-# https://github.com/osresearch/heads/commit/acf16c7304de8675f66ecc204b2abea25f0f67a3
-COMPILE_MAKE_OPTIONS += -j1
 include ../../mk/spksrc.cross-cc.mk

cross/slang/patches/001-disable-parallel-make.patch

@@ -0,0 +1,37 @@
+# try to avoid build errors by disabling parallel make
+# 
+--- autoconf/Makefile.in.org	2011-04-11 02:37:07.000000000 +0000
++++ autoconf/Makefile.in	2020-10-06 19:22:35.175361801 +0000
+@@ -97,3 +97,5 @@
+ #
+ .PHONY: all help static elf install clean check install-elf install-static makefiles install-pkgconfig
+ #
++.NOTPARALLEL:
++#
+
+--- src/Makefile.in.org	2011-04-11 02:37:07.000000000 +0000
++++ src/Makefile.in	2020-10-06 19:28:52.395123281 +0000
+@@ -247,3 +247,5 @@
+ #---------------------------------------------------------------------------
+ # Object Rules : These are created from the configure script (hopefully)
+ #---------------------------------------------------------------------------
++
++.NOTPARALLEL:
+
+--- slsh/Makefile.in.org	2020-10-06 19:40:56.828016639 +0000
++++ slsh/Makefile.in	2020-10-06 19:41:05.660705644 +0000
+@@ -163,3 +163,5 @@
+   install_lib_files install_rline_files install_scripts install_help \
+   install_docs
+ 
++.NOTPARALLEL:
++
+
+--- modules/Makefile.in.org	2011-04-11 02:37:07.000000000 +0000
++++ modules/Makefile.in	2020-10-06 19:28:36.270244972 +0000
+@@ -169,3 +169,5 @@
+ 	-/bin/rm -f Makefile
+ 
+ .PHONY: $(MODULES) clean distclean all install
++
++.NOTPARALLEL: