two fixes and now actually builds on armv7hf:

- mips, ppc and arm platforms want -latomic, so provide it
- link -larm on netbsd/arm to find arm_sync_icache()

lang/nodejs/Makefile

@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.196 2020/10/08 10:58:35 adam Exp $
+# $NetBSD: Makefile,v 1.197 2020/10/17 21:48:41 mrg Exp $
 
 DISTNAME=	node-v14.13.1
 EXTRACT_SUFX=	.tar.xz
@@ -24,6 +24,13 @@ CXXFLAGS+=	-mstackrealign
 
 .include "options.mk"
 
+# Node turns on -latomic for arm, mips and ppc.
+.if !empty(MACHINE_ARCH:M*arm*) || \
+    !empty(MACHINE_ARCH:M*powerpc*) || \
+    !empty(MACHINE_ARCH:M*mips*)
+.include "../../devel/libatomic/buildlink3.mk"
+.endif
+
 .include "../../lang/nodejs/Makefile.common"
 .include "../../textproc/icu/buildlink3.mk"
 # Requires nghttp2_option_set_max_settings

lang/nodejs/distinfo

@@ -1,4 +1,4 @@
-$NetBSD: distinfo,v 1.184 2020/10/17 07:22:15 mrg Exp $
+$NetBSD: distinfo,v 1.185 2020/10/17 21:48:41 mrg Exp $
 
 SHA1 (node-v14.13.1.tar.xz) = 2bed8e2334d0a71a2e430539ae075e519642732e
 RMD160 (node-v14.13.1.tar.xz) = 64015436572aed17a85acf2078be7e2e6a746607
@@ -25,3 +25,4 @@ SHA1 (patch-src_node__postmortem__metadata.cc) = 9938482d724ad6636af5dc3fa719ec2
 SHA1 (patch-tools_gyp_pylib_gyp_generator_make.py) = 34d4f113d85b4502bc8240fac50dc37554ab4ebb
 SHA1 (patch-tools_gyp_pylib_gyp_xcode__emulation.py) = 4ee24115f5e97ffbd23aaa6dc62f408d381d4e22
 SHA1 (patch-tools_install.py) = 8058eb63387971b97a1c3573d1875befeb873e77
+SHA1 (patch-tools_v8_gypfiles_v8.gyp) = 49cfd4fa8a8122c6f74965a2e87bbca6d0e44efc

lang/nodejs/patches/patch-tools_v8_gypfiles_v8.gyp

@@ -0,0 +1,19 @@
+$NetBSD: patch-tools_v8_gypfiles_v8.gyp,v 1.1 2020/10/17 21:48:41 mrg Exp $
+
+Add -larm on netbsd arm platforms.
+
+--- tools/v8_gypfiles/v8.gyp.orig	2020-10-07 10:47:43.000000000 -0700
++++ tools/v8_gypfiles/v8.gyp	2020-10-17 13:16:57.485883322 -0700
+@@ -903,6 +903,12 @@
+         }],
+         # Platforms that don't have Compare-And-Swap (CAS) support need to link atomic library
+         # to implement atomic memory access
++        # NetBSD/arm also needs -larm.
++        ['OS == "netbsd" and v8_current_cpu in ["arm"]', {
++          'link_settings': {
++            'libraries': ['-larm', ],
++          },
++        }],
+         ['v8_current_cpu in ["mips", "mipsel", "mips64", "mips64el", "ppc", "arm"]', {
+           'link_settings': {
+             'libraries': ['-latomic', ],