Build iperf3 statically

Makefile

@@ -101,6 +101,8 @@ endif
 iperf3:
 ifeq ($(arch), x86_64)
 	@echo Building iperf3
+	@mkdir -p $(out_dir)/dev
+	@dd if=/dev/urandom of=$(out_dir)/dev/urandom count=512
 	@cd iperf3 && make arch=$(arch) all
 	@cp iperf3/build/$(arch)/iperf3 $(out_dir)
 endif
@@ -110,7 +112,7 @@ $(alpine):
 
 alpine: $(alpine)
 ifeq ($(arch), $(filter $(arch), x86_64 aarch64))
-	@mkdir -p $(out_dir)
+	@mkdir -p $(out_dir)/etc
 	@echo "nameserver 101.6.6.6" > $(out_dir)/etc/resolv.conf
 	@cd $(out_dir) && tar xvf ../../$(alpine)
 endif

iperf3/Makefile

@@ -20,7 +20,7 @@ $(iperf3_dir)/src/iperf3: $(iperf3_dir)
 	sed -i 's/-pg//' $(iperf3_dir)/src/Makefile.am
 	cd $(iperf3_dir) && autoreconf
 	cd $(iperf3_dir) && ./configure CC=$(cc) --disable-shared --enable-static --without-openssl --host $(arch)-linux-musl
-	cd $(iperf3_dir) && make
+	cd $(iperf3_dir) && make iperf3_CFLAGS="--static"
 
 $(bin_unstripped): $(iperf3_dir)/src/iperf3
 	cp $(iperf3_dir)/src/iperf3 $(bin_unstripped)