nss needs 3GB swap during build

Makefile

 all:
+	dd if=/dev/zero of=swap bs=1048576 count=3072
+	chmod 600 swap
+	mkswap swap
+	swapon swap
 	tar xf nss-3.54.tar.gz
+
 	patch -Np1 -d nss-3.54 < nss-3.54-standalone-1.patch
 	$(MAKE) -C nss-3.54/nss -j1 BUILD_OPT=1 NSPR_INCLUDE_DIR=/usr/include/nspr USE_SYSTEM_ZLIB=1 ZLIB_LIBS=-lz NSS_ENABLE_WERROR=0 $$([ $$(uname -m) = x86_64 ] || [ $$(uname -m) = aarch64 ] && echo USE_64=1) $$([ -f /usr/include/sqlite3.h ] && echo NSS_USE_SYSTEM_SQLITE=1)
 	install -v -m755 nss-3.54/dist/Linux*/lib/*.so              /usr/lib
@@ -10,3 +15,6 @@ all:
 	install -v -m755 nss-3.54/dist/Linux*/bin/{certutil,nss-config,pk12util} /usr/bin
 	install -v -m644 nss-3.54/dist/Linux*/lib/pkgconfig/nss.pc  /usr/lib/pkgconfig
 	rm -rf nss-3.54
+
+	swapoff swap
+	rm -rf swap