mqtt client publish program error ssl

oot@accord-water:/home/user/paho.mqtt.c# make clean

rm -rf build/output/*

rm -rf build/*

root@accord-water:/home/user/paho.mqtt.c# make

mkdir -p build/output/samples

mkdir -p build/output/test

echo OSTYPE is Linux

OSTYPE is Linux

sed -e "s/@CLIENT_VERSION@/1.3.0/g" -e "s/@BUILD_TIMESTAMP@/Monday 15 February 2021 12:12:57 PM IST/g" src/VersionInfo.h.in > build/VersionInfo.h

cc -g -fPIC -Os -Wall -fvisibility=hidden -Ibuild -o build/output/libpaho-mqtt3c.so.1.0 src/Heap.c src/Socket.c src/MQTTProtocolClient.c src/MQTTProtocolOut.c src/SHA1.c src/MQTTProperties.c src/MQTTPersistenceDefault.c src/Messages.c src/MQTTPacketOut.c src/WebSocket.c src/Clients.c src/OsWrapper.c src/Thread.c src/MQTTPacket.c src/MQTTClient.c src/Log.c src/StackTrace.c src/LinkedList.c src/MQTTReasonCodes.c src/MQTTPersistence.c src/utf-8.c src/SocketBuffer.c src/Base64.c src/Tree.c -shared -Wl,-init,MQTTClient_init -lpthread -Wl,-soname,libpaho-mqtt3c.so.1

ln -s libpaho-mqtt3c.so.1.0 build/output/libpaho-mqtt3c.so.1

ln -s libpaho-mqtt3c.so.1 build/output/libpaho-mqtt3c.so

cc -g -fPIC -Os -Wall -fvisibility=hidden -Ibuild -o build/output/libpaho-mqtt3cs.so.1.0 src/Heap.c src/Socket.c src/SSLSocket.c src/MQTTProtocolClient.c src/MQTTProtocolOut.c src/SHA1.c src/MQTTProperties.c src/MQTTPersistenceDefault.c src/Messages.c src/MQTTPacketOut.c src/WebSocket.c src/Clients.c src/OsWrapper.c src/Thread.c src/MQTTPacket.c src/MQTTClient.c src/Log.c src/StackTrace.c src/LinkedList.c src/MQTTReasonCodes.c src/MQTTPersistence.c src/utf-8.c src/SocketBuffer.c src/Base64.c src/Tree.c -DOPENSSL -shared -Wl,--start-group -lpthread -ldl -lssl -lcrypto -Wl,--end-group -Wl,-init,MQTTClient_init -Wl,-soname,libpaho-mqtt3cs.so.1 -Wl,-no-whole-archive

In file included from src/Socket.c:33:

src/SocketBuffer.h:28:10: fatal error: openssl/ssl.h: No such file or directory

28 | #include <openssl/ssl.h>

| ^~~~~~~~~~~~~~~

compilation terminated.

In file included from src/SSLSocket.c:31:

src/SocketBuffer.h:28:10: fatal error: openssl/ssl.h: No such file or directory

28 | #include <openssl/ssl.h>

| ^~~~~~~~~~~~~~~

compilation terminated.

In file included from src/MQTTPacket.h:26,

from src/MQTTProtocolClient.h:25,

from src/MQTTProtocolClient.c:35:

src/SSLSocket.h:29:10: fatal error: openssl/ssl.h: No such file or directory

29 | #include <openssl/ssl.h>

| ^~~~~~~~~~~~~~~

compilation terminated.

In file included from src/MQTTPacket.h:26,

from src/MQTTProtocolOut.h:25,

from src/MQTTProtocolOut.c:36:

src/SSLSocket.h:29:10: fatal error: openssl/ssl.h: No such file or directory

29 | #include <openssl/ssl.h>

| ^~~~~~~~~~~~~~~

compilation terminated.

In file included from src/SHA1.c:17:

src/SHA1.h:21:10: fatal error: openssl/sha.h: No such file or directory

21 | #include <openssl/sha.h>

| ^~~~~~~~~~~~~~~

compilation terminated.

In file included from src/MQTTPacket.h:26,

from src/MQTTProperties.c:19:

src/SSLSocket.h:29:10: fatal error: openssl/ssl.h: No such file or directory

29 | #include <openssl/ssl.h>

|

i tried for mqtt client as per procedure given at at your website. please help for yhis error