Openssl移植到ARM开发板 https://blog.csdn.net/lingyuncao/article/details/90667781
./config no-asm -shared --prefix=/home/ch/linux/pack/lib/openssl/arm
编译工具修改Makefile
make
make install
交叉编译 MQTT paho.mqtt.c https://blog.csdn.net/qq_39436605/article/details/82017454
1修改Makefile。在129行添加openssl的链接目录，注意改成你自己的路径。
CC ?=
CFLAGS += -I /home/ch/linux/pack/lib/openssl/arm/include
LDFLAGS += -L /home/ch/linux/pack/lib/openssl/arm/lib
make CC=arm-linux-gnueabihf-gcc