tce-load -i compiletc openssl-dev

wget https://www.libssh2.org/download/libssh2-1.11.0.tar.gz

cd libssh2-1.11.0

CC="gcc -flto -mtune=generic -Os -pipe" CXX="g++ -flto -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --disable-static --localstatedir=/var

find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make [0m 14.47s]
sudo make install

  version:          1.11.0
  Host type:        x86_64-pc-linux-gnu
  Install prefix:   /usr/local
  Compiler:         gcc -flto -mtune=generic -Os -pipe
  Compiler flags:   -g -O2
  Library types:    Shared=yes, Static=no
  Crypto library:   OpenSSL
  zlib compression: yes
  Clear memory:     yes
  Debug build:      no
  Build examples:   yes
  Run Docker tests: yes
  Run sshd tests:   yes
  Path to sshd:     /usr/local/sbin/sshd (only for self-tests